1Arm CPU Specific Build Macros 2============================= 3 4This document describes the various build options present in the CPU specific 5operations framework to enable errata workarounds and to enable optimizations 6for a specific CPU on a platform. 7 8Security Vulnerability Workarounds 9---------------------------------- 10 11TF-A exports a series of build flags which control which security 12vulnerability workarounds should be applied at runtime. 13 14- ``WORKAROUND_CVE_2017_5715``: Enables the security workaround for 15 `CVE-2017-5715`_. This flag can be set to 0 by the platform if none 16 of the PEs in the system need the workaround. Setting this flag to 0 provides 17 no performance benefit for non-affected platforms, it just helps to comply 18 with the recommendation in the spec regarding workaround discovery. 19 Defaults to 1. 20 21- ``WORKAROUND_CVE_2018_3639``: Enables the security workaround for 22 `CVE-2018-3639`_. Defaults to 1. The TF-A project recommends to keep 23 the default value of 1 even on platforms that are unaffected by 24 CVE-2018-3639, in order to comply with the recommendation in the spec 25 regarding workaround discovery. 26 27- ``DYNAMIC_WORKAROUND_CVE_2018_3639``: Enables dynamic mitigation for 28 `CVE-2018-3639`_. This build option should be set to 1 if the target 29 platform contains at least 1 CPU that requires dynamic mitigation. 30 Defaults to 0. 31 32- ``WORKAROUND_CVE_2022_23960``: Enables mitigation for `CVE-2022-23960`_. 33 This build option should be set to 1 if the target platform contains at 34 least 1 CPU that requires this mitigation. Defaults to 1. 35 36- ``WORKAROUND_CVE_2024_5660``: Enables mitigation for `CVE-2024-5660`. 37 The fix is to disable hardware page aggregation by setting CPUECTLR_EL1[46] 38 in EL3 FW. This build option should be set to 1 if the target platform contains 39 at least 1 CPU that requires this mitigation. Defaults to 1. 40 41- ``WORKAROUND_CVE_2024_7881``: Enables mitigation for `CVE-2024-7881`. 42 This build option should be set to 1 if the target platform contains at 43 least 1 CPU that requires this mitigation. Defaults to 1. 44 45.. _arm_cpu_macros_errata_workarounds: 46 47CPU Errata Workarounds 48---------------------- 49 50TF-A exports a series of build flags which control the errata workarounds that 51are applied to each CPU by the reset handler. The errata details can be found 52in the CPU specific errata documents published by Arm: 53For example: `Cortex-A72 MPCore Software Developers Errata Notice`_ 54 55The errata workarounds are implemented for a particular revision or a set of 56processor revisions. This is checked by the reset handler at runtime. Each 57errata workaround is identified by its ``ID`` as specified in the processor's 58errata notice document. The format of the define used to enable/disable the 59errata workaround is ``ERRATA_<Processor name>_<ID>``, where the ``Processor name`` 60is for example ``A57`` for the ``Cortex_A57`` CPU. 61 62Refer to :ref:`firmware_design_cpu_errata_implementation` for information on how to 63write errata workaround functions. 64 65All workarounds are disabled by default. The platform is responsible for 66enabling these workarounds according to its requirement by defining the 67errata workaround build flags in the platform specific makefile. In case 68these workarounds are enabled for the wrong CPU revision then the errata 69workaround is not applied. In the DEBUG build, this is indicated by 70printing a warning to the crash console. 71 72In the current implementation, a platform which has more than 1 variant 73with different revisions of a processor has no runtime mechanism available 74for it to specify which errata workarounds should be enabled or not. 75 76The value of the build flags is 0 by default, that is, disabled. A value of 1 77will enable it. 78 79For Cortex-A9, the following errata build flags are defined : 80 81- ``ERRATA_A9_794073``: This applies errata 794073 workaround to Cortex-A9 82 CPU. This needs to be enabled for all revisions of the CPU. 83 84For Cortex-A15, the following errata build flags are defined : 85 86- ``ERRATA_A15_816470``: This applies errata 816470 workaround to Cortex-A15 87 CPU. This needs to be enabled only for revision >= r3p0 of the CPU. 88 89- ``ERRATA_A15_827671``: This applies errata 827671 workaround to Cortex-A15 90 CPU. This needs to be enabled only for revision >= r3p0 of the CPU. 91 92For Cortex-A17, the following errata build flags are defined : 93 94- ``ERRATA_A17_852421``: This applies errata 852421 workaround to Cortex-A17 95 CPU. This needs to be enabled only for revision <= r1p2 of the CPU. 96 97- ``ERRATA_A17_852423``: This applies errata 852423 workaround to Cortex-A17 98 CPU. This needs to be enabled only for revision <= r1p2 of the CPU. 99 100For Cortex-A35, the following errata build flags are defined : 101 102- ``ERRATA_A35_855472``: This applies errata 855472 workaround to Cortex-A35 103 CPUs. This needs to be enabled only for revision r0p0 of Cortex-A35. 104 105For Cortex-A53, the following errata build flags are defined : 106 107- ``ERRATA_A53_819472``: This applies errata 819472 workaround to all 108 CPUs. This needs to be enabled only for revision <= r0p1 of Cortex-A53. 109 110- ``ERRATA_A53_824069``: This applies errata 824069 workaround to all 111 CPUs. This needs to be enabled only for revision <= r0p2 of Cortex-A53. 112 113- ``ERRATA_A53_826319``: This applies errata 826319 workaround to Cortex-A53 114 CPU. This needs to be enabled only for revision <= r0p2 of the CPU. 115 116- ``ERRATA_A53_827319``: This applies errata 827319 workaround to all 117 CPUs. This needs to be enabled only for revision <= r0p2 of Cortex-A53. 118 119- ``ERRATA_A53_835769``: This applies erratum 835769 workaround at compile and 120 link time to Cortex-A53 CPU. This needs to be enabled for some variants of 121 revision <= r0p4. This workaround can lead the linker to create ``*.stub`` 122 sections. 123 124- ``ERRATA_A53_836870``: This applies errata 836870 workaround to Cortex-A53 125 CPU. This needs to be enabled only for revision <= r0p3 of the CPU. From 126 r0p4 and onwards, this errata is enabled by default in hardware. Identical to 127 ``A53_DISABLE_NON_TEMPORAL_HINT``. 128 129- ``ERRATA_A53_843419``: This applies erratum 843419 workaround at link time 130 to Cortex-A53 CPU. This needs to be enabled for some variants of revision 131 <= r0p4. This workaround can lead the linker to emit ``*.stub`` sections 132 which are 4kB aligned. 133 134- ``ERRATA_A53_855873``: This applies errata 855873 workaround to Cortex-A53 135 CPUs. Though the erratum is present in every revision of the CPU, 136 this workaround is only applied to CPUs from r0p3 onwards, which feature 137 a chicken bit in CPUACTLR_EL1 to enable a hardware workaround. 138 Earlier revisions of the CPU have other errata which require the same 139 workaround in software, so they should be covered anyway. 140 141- ``ERRATA_A53_1530924``: This applies errata 1530924 workaround to all 142 revisions of Cortex-A53 CPU. 143 144For Cortex-A55, the following errata build flags are defined : 145 146- ``ERRATA_A55_768277``: This applies errata 768277 workaround to Cortex-A55 147 CPU. This needs to be enabled only for revision r0p0 of the CPU. 148 149- ``ERRATA_A55_778703``: This applies errata 778703 workaround to Cortex-A55 150 CPU. This needs to be enabled only for revision r0p0 of the CPU. 151 152- ``ERRATA_A55_798797``: This applies errata 798797 workaround to Cortex-A55 153 CPU. This needs to be enabled only for revision r0p0 of the CPU. 154 155- ``ERRATA_A55_846532``: This applies errata 846532 workaround to Cortex-A55 156 CPU. This needs to be enabled only for revision <= r0p1 of the CPU. 157 158- ``ERRATA_A55_903758``: This applies errata 903758 workaround to Cortex-A55 159 CPU. This needs to be enabled only for revision <= r0p1 of the CPU. 160 161- ``ERRATA_A55_1221012``: This applies errata 1221012 workaround to Cortex-A55 162 CPU. This needs to be enabled only for revision <= r1p0 of the CPU. 163 164- ``ERRATA_A55_1530923``: This applies errata 1530923 workaround to all 165 revisions of Cortex-A55 CPU. 166 167For Cortex-A57, the following errata build flags are defined : 168 169- ``ERRATA_A57_806969``: This applies errata 806969 workaround to Cortex-A57 170 CPU. This needs to be enabled only for revision r0p0 of the CPU. 171 172- ``ERRATA_A57_813419``: This applies errata 813419 workaround to Cortex-A57 173 CPU. This needs to be enabled only for revision r0p0 of the CPU. 174 175- ``ERRATA_A57_813420``: This applies errata 813420 workaround to Cortex-A57 176 CPU. This needs to be enabled only for revision r0p0 of the CPU. 177 178- ``ERRATA_A57_814670``: This applies errata 814670 workaround to Cortex-A57 179 CPU. This needs to be enabled only for revision r0p0 of the CPU. 180 181- ``ERRATA_A57_817169``: This applies errata 817169 workaround to Cortex-A57 182 CPU. This needs to be enabled only for revision <= r0p1 of the CPU. 183 184- ``ERRATA_A57_826974``: This applies errata 826974 workaround to Cortex-A57 185 CPU. This needs to be enabled only for revision <= r1p1 of the CPU. 186 187- ``ERRATA_A57_826977``: This applies errata 826977 workaround to Cortex-A57 188 CPU. This needs to be enabled only for revision <= r1p1 of the CPU. 189 190- ``ERRATA_A57_828024``: This applies errata 828024 workaround to Cortex-A57 191 CPU. This needs to be enabled only for revision <= r1p1 of the CPU. 192 193- ``ERRATA_A57_829520``: This applies errata 829520 workaround to Cortex-A57 194 CPU. This needs to be enabled only for revision <= r1p2 of the CPU. 195 196- ``ERRATA_A57_833471``: This applies errata 833471 workaround to Cortex-A57 197 CPU. This needs to be enabled only for revision <= r1p2 of the CPU. 198 199- ``ERRATA_A57_859972``: This applies errata 859972 workaround to Cortex-A57 200 CPU. This needs to be enabled only for revision <= r1p3 of the CPU. 201 202- ``ERRATA_A57_1319537``: This applies errata 1319537 workaround to all 203 revisions of Cortex-A57 CPU. 204 205For Cortex-A65, the following errata build flags are defined : 206 207- ``ERRATA_A65_1179935``: This applies errata 1179935 workaround to Cortex-A65 208 CPU. This needs to be enabled only for revision r0p0 of the CPU, and is fixed 209 in r1p0. 210 211- ``ERRATA_A65_1227419``: This applies errata 1227419 workaround to Cortex-A65 212 CPU. This needs to be enabled only for revision r0p0 and r1p0 of the CPU and 213 is fixed in r1p1. 214 215- ``ERRATA_A65_1541130``: This applies errata 1541130 workaround to r0p0, r1p0, 216 r1p1, r1p2 revisions of the CPU and is still open. 217 218For Cortex-A72, the following errata build flags are defined : 219 220- ``ERRATA_A72_859971``: This applies errata 859971 workaround to Cortex-A72 221 CPU. This needs to be enabled only for revision <= r0p3 of the CPU. 222 223- ``ERRATA_A72_1319367``: This applies errata 1319367 workaround to all 224 revisions of Cortex-A72 CPU. 225 226For Cortex-A73, the following errata build flags are defined : 227 228- ``ERRATA_A73_852427``: This applies errata 852427 workaround to Cortex-A73 229 CPU. This needs to be enabled only for revision r0p0 of the CPU. 230 231- ``ERRATA_A73_855423``: This applies errata 855423 workaround to Cortex-A73 232 CPU. This needs to be enabled only for revision <= r0p1 of the CPU. 233 234For Cortex-A75, the following errata build flags are defined : 235 236- ``ERRATA_A75_764081``: This applies errata 764081 workaround to Cortex-A75 237 CPU. This needs to be enabled only for revision r0p0 of the CPU. 238 239- ``ERRATA_A75_790748``: This applies errata 790748 workaround to Cortex-A75 240 CPU. This needs to be enabled only for revision r0p0 of the CPU. 241 242For Cortex-A76, the following errata build flags are defined : 243 244- ``ERRATA_A76_1073348``: This applies errata 1073348 workaround to Cortex-A76 245 CPU. This needs to be enabled only for revision <= r1p0 of the CPU. 246 247- ``ERRATA_A76_1130799``: This applies errata 1130799 workaround to Cortex-A76 248 CPU. This needs to be enabled only for revision <= r2p0 of the CPU. 249 250- ``ERRATA_A76_1220197``: This applies errata 1220197 workaround to Cortex-A76 251 CPU. This needs to be enabled only for revision <= r2p0 of the CPU. 252 253- ``ERRATA_A76_1257314``: This applies errata 1257314 workaround to Cortex-A76 254 CPU. This needs to be enabled only for revision <= r3p0 of the CPU. 255 256- ``ERRATA_A76_1262606``: This applies errata 1262606 workaround to Cortex-A76 257 CPU. This needs to be enabled only for revision <= r3p0 of the CPU. 258 259- ``ERRATA_A76_1262888``: This applies errata 1262888 workaround to Cortex-A76 260 CPU. This needs to be enabled only for revision <= r3p0 of the CPU. 261 262- ``ERRATA_A76_1275112``: This applies errata 1275112 workaround to Cortex-A76 263 CPU. This needs to be enabled only for revision <= r3p0 of the CPU. 264 265- ``ERRATA_A76_1791580``: This applies errata 1791580 workaround to Cortex-A76 266 CPU. This needs to be enabled only for revision <= r4p0 of the CPU. 267 268- ``ERRATA_A76_1165522``: This applies errata 1165522 workaround to all 269 revisions of Cortex-A76 CPU. This errata is fixed in r3p0 but due to 270 limitation of errata framework this errata is applied to all revisions 271 of Cortex-A76 CPU. 272 273- ``ERRATA_A76_1868343``: This applies errata 1868343 workaround to Cortex-A76 274 CPU. This needs to be enabled only for revision <= r4p0 of the CPU. 275 276- ``ERRATA_A76_1946160``: This applies errata 1946160 workaround to Cortex-A76 277 CPU. This needs to be enabled only for revisions r3p0 - r4p1 of the CPU. 278 279- ``ERRATA_A76_2743102``: This applies errata 2743102 workaround to Cortex-A76 280 CPU. This needs to be enabled for all revisions <= r4p1 of the CPU and is 281 still open. 282 283For Cortex-A76AE, the following errata build flags are defined : 284 285- ``ERRATA_A76AE_1931427``: This applies errata 1931427 workaround to Cortex-A76AE 286 CPU. This needs to be enabled for revision r0p0 and r1p0 of the CPU and it is 287 fixed in r1p1. 288 289- ``ERRATA_A76AE_1931435``: This applies errata 1931435 workaround to Cortex-A76AE 290 CPU. This needs to be enabled for revision r0p0 and r1p0 of the CPU and it is 291 fixed in r1p1. 292 293- ``ERRATA_A76AE_1969401``: This applies errata 1969401 workaround to Cortex-A76AE 294 CPU. This needs to be enabled for revision r0p0 and r1p0 of the CPU and it is 295 fixed in r1p1. 296 297- ``ERRATA_A76AE_2371140``: This applies errata 2371140 workaround to Cortex-A76AE 298 CPU. This needs to be enabled for all revisions <= r1p1 of the CPU and is 299 still open. 300 301For Cortex-A77, the following errata build flags are defined : 302 303- ``ERRATA_A77_1508412``: This applies errata 1508412 workaround to Cortex-A77 304 CPU. This needs to be enabled only for revision <= r1p0 of the CPU. 305 306- ``ERRATA_A77_1925769``: This applies errata 1925769 workaround to Cortex-A77 307 CPU. This needs to be enabled only for revision <= r1p1 of the CPU. 308 309- ``ERRATA_A77_1946167``: This applies errata 1946167 workaround to Cortex-A77 310 CPU. This needs to be enabled only for revision <= r1p1 of the CPU. 311 312- ``ERRATA_A77_1791578``: This applies errata 1791578 workaround to Cortex-A77 313 CPU. This needs to be enabled for r0p0, r1p0, and r1p1, it is still open. 314 315- ``ERRATA_A77_2356587``: This applies errata 2356587 workaround to Cortex-A77 316 CPU. This needs to be enabled for r0p0, r1p0, and r1p1, it is still open. 317 318 - ``ERRATA_A77_1800714``: This applies errata 1800714 workaround to Cortex-A77 319 CPU. This needs to be enabled for revisions <= r1p1 of the CPU. 320 321 - ``ERRATA_A77_2743100``: This applies errata 2743100 workaround to Cortex-A77 322 CPU. This needs to be enabled for r0p0, r1p0, and r1p1, it is still open. 323 324For Cortex-A78, the following errata build flags are defined : 325 326- ``ERRATA_A78_1688305``: This applies errata 1688305 workaround to Cortex-A78 327 CPU. This needs to be enabled only for revision r0p0 - r1p0 of the CPU. 328 329- ``ERRATA_A78_1941498``: This applies errata 1941498 workaround to Cortex-A78 330 CPU. This needs to be enabled for revisions r0p0, r1p0, and r1p1 of the CPU. 331 332- ``ERRATA_A78_1951500``: This applies errata 1951500 workaround to Cortex-A78 333 CPU. This needs to be enabled for revisions r1p0 and r1p1, r0p0 has the same 334 issue but there is no workaround for that revision. 335 336- ``ERRATA_A78_1821534``: This applies errata 1821534 workaround to Cortex-A78 337 CPU. This needs to be enabled for revisions r0p0 and r1p0. 338 339- ``ERRATA_A78_1952683``: This applies errata 1952683 workaround to Cortex-A78 340 CPU. This needs to be enabled for revision r0p0, it is fixed in r1p0. 341 342- ``ERRATA_A78_2242635``: This applies errata 2242635 workaround to Cortex-A78 343 CPU. This needs to be enabled for revisions r1p0, r1p1, and r1p2. The issue 344 is present in r0p0 but there is no workaround. It is still open. 345 346- ``ERRATA_A78_2376745``: This applies errata 2376745 workaround to Cortex-A78 347 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1, and r1p2, and 348 it is still open. 349 350- ``ERRATA_A78_2395406``: This applies errata 2395406 workaround to Cortex-A78 351 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1, and r1p2, and 352 it is still open. 353 354- ``ERRATA_A78_2712571``: This applies erratum 2712571 workaround to Cortex-A78 355 CPU, this erratum affects system configurations that do not use an ARM 356 interconnect IP. This needs to be enabled for revisions r0p0, r1p0, r1p1 357 and r1p2 and it is still open. 358 359- ``ERRATA_A78_2742426``: This applies erratum 2742426 workaround to Cortex-A78 360 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1 and r1p2 and 361 it is still open. 362 363- ``ERRATA_A78_2772019``: This applies errata 2772019 workaround to Cortex-A78 364 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1, and r1p2, and 365 it is still open. 366 367- ``ERRATA_A78_2779479``: This applies erratum 2779479 workaround to Cortex-A78 368 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1 and r1p2 and 369 it is still open. 370 371For Cortex-A78AE, the following errata build flags are defined : 372 373- ``ERRATA_A78_AE_1941500`` : This applies errata 1941500 workaround to 374 Cortex-A78AE CPU. This needs to be enabled for revisions r0p0 and r0p1. 375 This erratum is still open. 376 377- ``ERRATA_A78_AE_1951502`` : This applies errata 1951502 workaround to 378 Cortex-A78AE CPU. This needs to be enabled for revisions r0p0 and r0p1. This 379 erratum is still open. 380 381- ``ERRATA_A78_AE_2376748`` : This applies errata 2376748 workaround to 382 Cortex-A78AE CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2. 383 This erratum is still open. 384 385- ``ERRATA_A78_AE_2395408`` : This applies errata 2395408 workaround to 386 Cortex-A78AE CPU. This needs to be enabled for revisions r0p0 and r0p1. This 387 erratum is still open. 388 389- ``ERRATA_A78_AE_2712574`` : This applies erratum 2712574 workaround to 390 Cortex-A78AE CPU. This erratum affects system configurations that do not use 391 an ARM interconnect IP. This needs to be enabled for revisions r0p0, r0p1 and 392 r0p2. This erratum is still open. 393 394For Cortex-A78C, the following errata build flags are defined : 395 396- ``ERRATA_A78C_1827430`` : This applies errata 1827430 workaround to 397 Cortex-A78C CPU. This needs to be enabled for revision r0p0. The erratum is 398 fixed in r0p1. 399 400- ``ERRATA_A78C_1827440`` : This applies errata 1827440 workaround to 401 Cortex-A78C CPU. This needs to be enabled for revision r0p0. The erratum is 402 fixed in r0p1. 403 404- ``ERRATA_A78C_2242638`` : This applies errata 2242638 workaround to 405 Cortex-A78C CPU. This needs to be enabled for revisions r0p1, r0p2 and 406 it is still open. 407 408- ``ERRATA_A78C_2376749`` : This applies errata 2376749 workaround to 409 Cortex-A78C CPU. This needs to be enabled for revisions r0p1 and r0p2. This 410 erratum is still open. 411 412- ``ERRATA_A78C_2395411`` : This applies errata 2395411 workaround to 413 Cortex-A78C CPU. This needs to be enabled for revisions r0p1 and r0p2. This 414 erratum is still open. 415 416- ``ERRATA_A78C_2683027`` : This applies errata 2683027 workaround to 417 Cortex-A78C CPU. This needs to be enabled for revisions r0p1 and r0p2. This 418 erratum is still open. 419 420- ``ERRATA_A78C_2712575`` : This applies erratum 2712575 workaround to 421 Cortex-A78C CPU, this erratum affects system configurations that do not use 422 an ARM interconnect IP. This needs to be enabled for revisions r0p1 and r0p2 423 and is still open. 424 425- ``ERRATA_A78C_2743232`` : This applies erratum 2743232 workaround to 426 Cortex-A78C CPU. This needs to be enabled for revisions r0p1 and r0p2. 427 This erratum is still open. 428 429- ``ERRATA_A78C_2772121`` : This applies errata 2772121 workaround to 430 Cortex-A78C CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2. 431 This erratum is still open. 432 433- ``ERRATA_A78C_2779484`` : This applies errata 2779484 workaround to 434 Cortex-A78C CPU. This needs to be enabled for revisions r0p1 and r0p2. 435 This erratum is still open. 436 437For Cortex-X1 CPU, the following errata build flags are defined: 438 439- ``ERRATA_X1_1821534`` : This applies errata 1821534 workaround to Cortex-X1 440 CPU. This needs to be enabled only for revision <= r1p0 of the CPU. 441 442- ``ERRATA_X1_1688305`` : This applies errata 1688305 workaround to Cortex-X1 443 CPU. This needs to be enabled only for revision <= r1p0 of the CPU. 444 445- ``ERRATA_X1_1827429`` : This applies errata 1827429 workaround to Cortex-X1 446 CPU. This needs to be enabled only for revision <= r1p0 of the CPU. 447 448For Neoverse N1, the following errata build flags are defined : 449 450- ``ERRATA_N1_1073348``: This applies errata 1073348 workaround to Neoverse-N1 451 CPU. This needs to be enabled only for revision r0p0 and r1p0 of the CPU. 452 453- ``ERRATA_N1_1130799``: This applies errata 1130799 workaround to Neoverse-N1 454 CPU. This needs to be enabled only for revision <= r2p0 of the CPU. 455 456- ``ERRATA_N1_1165347``: This applies errata 1165347 workaround to Neoverse-N1 457 CPU. This needs to be enabled only for revision <= r2p0 of the CPU. 458 459- ``ERRATA_N1_1207823``: This applies errata 1207823 workaround to Neoverse-N1 460 CPU. This needs to be enabled only for revision <= r2p0 of the CPU. 461 462- ``ERRATA_N1_1220197``: This applies errata 1220197 workaround to Neoverse-N1 463 CPU. This needs to be enabled only for revision <= r2p0 of the CPU. 464 465- ``ERRATA_N1_1257314``: This applies errata 1257314 workaround to Neoverse-N1 466 CPU. This needs to be enabled only for revision <= r3p0 of the CPU. 467 468- ``ERRATA_N1_1262606``: This applies errata 1262606 workaround to Neoverse-N1 469 CPU. This needs to be enabled only for revision <= r3p0 of the CPU. 470 471- ``ERRATA_N1_1262888``: This applies errata 1262888 workaround to Neoverse-N1 472 CPU. This needs to be enabled only for revision <= r3p0 of the CPU. 473 474- ``ERRATA_N1_1275112``: This applies errata 1275112 workaround to Neoverse-N1 475 CPU. This needs to be enabled only for revision <= r3p0 of the CPU. 476 477- ``ERRATA_N1_1315703``: This applies errata 1315703 workaround to Neoverse-N1 478 CPU. This needs to be enabled only for revision <= r3p0 of the CPU. 479 480- ``ERRATA_N1_1542419``: This applies errata 1542419 workaround to Neoverse-N1 481 CPU. This needs to be enabled only for revisions r3p0 - r4p0 of the CPU. 482 483- ``ERRATA_N1_1868343``: This applies errata 1868343 workaround to Neoverse-N1 484 CPU. This needs to be enabled only for revision <= r4p0 of the CPU. 485 486- ``ERRATA_N1_1946160``: This applies errata 1946160 workaround to Neoverse-N1 487 CPU. This needs to be enabled for revisions r3p0, r3p1, r4p0, and r4p1, for 488 revisions r0p0, r1p0, and r2p0 there is no workaround. 489 490- ``ERRATA_N1_2743102``: This applies errata 2743102 workaround to Neoverse-N1 491 CPU. This needs to be enabled for all revisions <= r4p1 of the CPU and is 492 still open. 493 494- ``ERRATA_N1_3324349``: This applies errata 3324349 workaround to Neoverse-N1 495 CPU. This needs to be enabled for all revisions <= r4p1 of the CPU and is 496 still open. 497 498For Neoverse V1, the following errata build flags are defined : 499 500- ``ERRATA_V1_1618635``: This applies errata 1618635 workaround to Neoverse-V1 501 CPU. This needs to be enabled for revision r0p0 of the CPU, it is fixed in 502 r1p0. 503 504- ``ERRATA_V1_1774420``: This applies errata 1774420 workaround to Neoverse-V1 505 CPU. This needs to be enabled only for revisions r0p0 and r1p0, it is fixed 506 in r1p1. 507 508- ``ERRATA_V1_1791573``: This applies errata 1791573 workaround to Neoverse-V1 509 CPU. This needs to be enabled only for revisions r0p0 and r1p0, it is fixed 510 in r1p1. 511 512- ``ERRATA_V1_1852267``: This applies errata 1852267 workaround to Neoverse-V1 513 CPU. This needs to be enabled only for revisions r0p0 and r1p0, it is fixed 514 in r1p1. 515 516- ``ERRATA_V1_1925756``: This applies errata 1925756 workaround to Neoverse-V1 517 CPU. This needs to be enabled for r0p0, r1p0, and r1p1, it is still open. 518 519- ``ERRATA_V1_1940577``: This applies errata 1940577 workaround to Neoverse-V1 520 CPU. This needs to be enabled only for revision r1p0 and r1p1 of the 521 CPU. 522 523- ``ERRATA_V1_1966096``: This applies errata 1966096 workaround to Neoverse-V1 524 CPU. This needs to be enabled for revisions r1p0 and r1p1 of the CPU, the 525 issue is present in r0p0 as well but there is no workaround for that 526 revision. It is still open. 527 528- ``ERRATA_V1_2139242``: This applies errata 2139242 workaround to Neoverse-V1 529 CPU. This needs to be enabled for revisions r0p0, r1p0, and r1p1 of the 530 CPU. It is still open. 531 532- ``ERRATA_V1_2216392``: This applies errata 2216392 workaround to Neoverse-V1 533 CPU. This needs to be enabled for revisions r1p0 and r1p1 of the CPU, the 534 issue is present in r0p0 as well but there is no workaround for that 535 revision. It is still open. 536 537- ``ERRATA_V1_2294912``: This applies errata 2294912 workaround to Neoverse-V1 538 CPU. This needs to be enabled for revisions r0p0, r1p0, and r1p1 and r1p2 of 539 the CPU. 540 541- ``ERRATA_V1_2348377``: This applies errata 2348377 workaroud to Neoverse-V1 542 CPU. This needs to be enabled for revisions r0p0, r1p0 and r1p1 of the CPU. 543 It has been fixed in r1p2. 544 545- ``ERRATA_V1_2372203``: This applies errata 2372203 workaround to Neoverse-V1 546 CPU. This needs to be enabled for revisions r0p0, r1p0 and r1p1 of the CPU. 547 It is still open. 548 549- ``ERRATA_V1_2701953``: This applies erratum 2701953 workaround to Neoverse-V1 550 CPU, this erratum affects system configurations that do not use an ARM 551 interconnect IP. This needs to be enabled for revisions r0p0, r1p0 and r1p1. 552 It has been fixed in r1p2. 553 554- ``ERRATA_V1_2743093``: This applies errata 2743093 workaround to Neoverse-V1 555 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1 and r1p2 of the 556 CPU. It is still open. 557 558- ``ERRATA_V1_2743233``: This applies erratum 2743233 workaround to Neoverse-V1 559 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1, and r1p2 of the 560 CPU. It is still open. 561 562- ``ERRATA_V1_2779461``: This applies erratum 2779461 workaround to Neoverse-V1 563 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1, r1p2 of the 564 CPU. It is still open. 565 566For Neoverse V2, the following errata build flags are defined : 567 568- ``ERRATA_V2_2618597``: This applies errata 2618597 workaround to Neoverse-V2 569 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in 570 r0p2. 571 572- ``ERRATA_V2_2662553``: This applies errata 2662553 workaround to Neoverse-V2 573 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in 574 r0p2. 575 576- ``ERRATA_V2_2719103``: This applies errata 2719103 workaround to Neoverse-V2 577 CPU, this affects system configurations that do not use and ARM interconnect 578 IP. This needs to be enabled for revisions r0p0 and r0p1. It has been fixed 579 in r0p2. 580 581- ``ERRATA_V2_2719105``: This applies errata 2719105 workaround to Neoverse-V2 582 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in 583 r0p2. 584 585- ``ERRATA_V2_2743011``: This applies errata 2743011 workaround to Neoverse-V2 586 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in 587 r0p2. 588 589- ``ERRATA_V2_2779510``: This applies errata 2779510 workaround to Neoverse-V2 590 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in 591 r0p2. 592 593- ``ERRATA_V2_2801372``: This applies errata 2801372 workaround to Neoverse-V2 594 CPU, this affects all configurations. This needs to be enabled for revisions 595 r0p0 and r0p1. It has been fixed in r0p2. 596 597- ``ERRATA_V2_3442699``: This applies errata 3442699 workaround to Neoverse-V2 598 CPU. This needs to be enabled for revision r0p0 - r0p2 and is still open. 599 600- ``ERRATA_V2_3701771``: This applies errata 3701771 workaround to Neoverse-V2 601 CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2 and is 602 still open. 603 604- ``ERRATA_V2_3841324``: This applies errata 3841324 workaround to Neoverse-V2 605 CPU. This needs to be enabled only for revisions r0p0 and r0p1 of 606 the CPU. It is fixed in r0p2. 607 608For Neoverse V3, the following errata build flags are defined : 609 610- ``ERRATA_V3_2970647``: This applies errata 2970647 workaround to Neoverse-V3 611 CPU. This needs to be enabled for revision r0p0. It is fixed in r0p1. 612 613- ``ERRATA_V3_3701767``: This applies errata 3701767 workaround to Neoverse-V3 614 CPU. This needs to be enabled for revisions r0p0, r0p1, r0p2 of the CPU and 615 is still open. 616 617For Cortex-A710, the following errata build flags are defined : 618 619- ``ERRATA_A710_1901946``: This applies errata 1901946 workaround to 620 Cortex-A710 CPU. This needs to be enabled only for revision r1p0. It has 621 been fixed in r2p0. 622 623- ``ERRATA_A710_1916945``: This applies errata 1916945 workaround to 624 Cortex-A710 CPU. This needs to be enabled only for revisions r0p0 and r1p0. 625 It has been fixed in r2p0. 626 627- ``ERRATA_A710_1917258``: This applies errata 1917258 workaround to 628 Cortex-A710 CPU. This needs to be enabled only for revisions r0p0 and r1p0. 629 It has been fixed in r2p0. 630 631- ``ERRATA_A710_1927200``: This applies errata 1927200 workaround to 632 Cortex-A710 CPU. This needs to be enabled only for revisions r0p0 and r1p0. 633 It has been fixed in r2p0. 634 635- ``ERRATA_A710_1987031``: This applies errata 1987031 workaround to 636 Cortex-A710 CPU. This needs to be enabled only for revisions r0p0, r1p0 and 637 r2p0 of the CPU. It is still open. 638 639- ``ERRATA_A710_2081180``: This applies errata 2081180 workaround to 640 Cortex-A710 CPU. This needs to be enabled only for revisions r0p0, r1p0 and 641 r2p0 of the CPU. It is still open. 642 643- ``ERRATA_A710_2055002``: This applies errata 2055002 workaround to 644 Cortex-A710 CPU. This needs to be enabled for revisions r1p0, r2p0 of the CPU 645 and is still open. 646 647- ``ERRATA_A710_2017096``: This applies errata 2017096 workaround to 648 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0 649 of the CPU and is still open. 650 651- ``ERRATA_A710_2083908``: This applies errata 2083908 workaround to 652 Cortex-A710 CPU. This needs to be enabled for revision r2p0 of the CPU and 653 is still open. 654 655- ``ERRATA_A710_2267065``: This applies errata 2267065 workaround to 656 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0 657 of the CPU and is fixed in r2p1. 658 659- ``ERRATA_A710_2136059``: This applies errata 2136059 workaround to 660 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0 661 of the CPU and is fixed in r2p1. 662 663- ``ERRATA_A710_2147715``: This applies errata 2147715 workaround to 664 Cortex-A710 CPU. This needs to be enabled for revision r2p0 of the CPU 665 and is fixed in r2p1. 666 667- ``ERRATA_A710_2216384``: This applies errata 2216384 workaround to 668 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0 669 of the CPU and is fixed in r2p1. 670 671- ``ERRATA_A710_2282622``: This applies errata 2282622 workaround to 672 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and 673 r2p1 of the CPU and is still open. 674 675- ``ERRATA_A710_2291219``: This applies errata 2291219 workaround to 676 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0 677 of the CPU and is fixed in r2p1. 678 679- ``ERRATA_A710_2008768``: This applies errata 2008768 workaround to 680 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0 681 of the CPU and is fixed in r2p1. 682 683- ``ERRATA_A710_2371105``: This applies errata 2371105 workaround to 684 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0 685 of the CPU and is fixed in r2p1. 686 687- ``ERRATA_A710_2701952``: This applies erratum 2701952 workaround to Cortex-A710 688 CPU, and applies to system configurations that do not use and ARM 689 interconnect IP. This needs to be enabled for r0p0, r1p0, r2p0 and r2p1 and 690 is still open. 691 692- ``ERRATA_A710_2742423``: This applies errata 2742423 workaround to 693 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and 694 r2p1 of the CPU and is still open. 695 696- ``ERRATA_A710_2768515``: This applies errata 2768515 workaround to 697 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and 698 r2p1 of the CPU and is still open. 699 700- ``ERRATA_A710_2778471``: This applies errata 2778471 workaround to Cortex-A710 701 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the 702 CPU and is still open. 703 704- ``ERRATA_A710_3324338``: This applies errata 3324338 workaround to 705 Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and 706 r2p1 of the CPU and is still open. 707 708- ``ERRATA_A710_3701772``: This applies errata 3701772 workaround to Cortex-A710 709 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0, r2p1 of the 710 CPU and is still open. 711 712For Neoverse N2, the following errata build flags are defined : 713 714- ``ERRATA_N2_2002655``: This applies errata 2002655 workaround to Neoverse-N2 715 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1. 716 717- ``ERRATA_N2_2009478``: This applies errata 2009478 workaround to Neoverse-N2 718 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1. 719 720- ``ERRATA_N2_2067956``: This applies errata 2067956 workaround to Neoverse-N2 721 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1. 722 723- ``ERRATA_N2_2025414``: This applies errata 2025414 workaround to Neoverse-N2 724 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1. 725 726- ``ERRATA_N2_2189731``: This applies errata 2189731 workaround to Neoverse-N2 727 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1. 728 729- ``ERRATA_N2_2138956``: This applies errata 2138956 workaround to Neoverse-N2 730 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1. 731 732- ``ERRATA_N2_2242415``: This applies errata 2242415 workaround to Neoverse-N2 733 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1. 734 735- ``ERRATA_N2_2138958``: This applies errata 2138958 workaround to Neoverse-N2 736 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1. 737 738- ``ERRATA_N2_2242400``: This applies errata 2242400 workaround to Neoverse-N2 739 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1. 740 741- ``ERRATA_N2_2280757``: This applies errata 2280757 workaround to Neoverse-N2 742 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1. 743 744- ``ERRATA_N2_2326639``: This applies errata 2326639 workaround to Neoverse-N2 745 CPU. This needs to be enabled for revision r0p0 of the CPU, it is fixed in 746 r0p1. 747 748- ``ERRATA_N2_2340933``: This applies errata 2340933 workaround to Neoverse-N2 749 CPU. This needs to be enabled for revision r0p0 of the CPU, it is fixed in 750 r0p1. 751 752- ``ERRATA_N2_2346952``: This applies errata 2346952 workaround to Neoverse-N2 753 CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2 of the CPU, 754 it is fixed in r0p3. 755 756- ``ERRATA_N2_2376738``: This applies errata 2376738 workaround to Neoverse-N2 757 CPU. This needs to be enabled for revision r0p0, r0p1, r0p2, r0p3 and is still open. 758 759- ``ERRATA_N2_2388450``: This applies errata 2388450 workaround to Neoverse-N2 760 CPU. This needs to be enabled for revision r0p0 of the CPU, it is fixed in 761 r0p1. 762 763- ``ERRATA_N2_2743014``: This applies errata 2743014 workaround to Neoverse-N2 764 CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2. It is fixed 765 in r0p3. 766 767- ``ERRATA_N2_2743089``: This applies errata 2743089 workaround to Neoverse-N2 768 CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2. It is fixed 769 in r0p3. 770 771- ``ERRATA_N2_2728475``: This applies erratum 2728475 workaround to Neoverse-N2 772 CPU, this erratum affects system configurations that do not use and ARM 773 interconnect IP. This needs to be enabled for revisions r0p0, r0p1 and r0p2. 774 It is fixed in r0p3. 775 776- ``ERRATA_N2_2779511``: This applies errata 2779511 workaround to Neoverse-N2 777 CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2. It is fixed 778 in r0p3. 779 780- ``ERRATA_N2_3324339``: This applies errata 3324339 workaround to Neoverse-N2 781 CPU. This needs to be enabled for revisions r0p0, r0p1, r0p2, r0p3 and is 782 still open. 783 784- ``ERRATA_N2_3701773``: This applies errata 3701773 workaround to Neoverse-N2 785 CPU. This needs to be enabled for revisions r0p0, r0p1, r0p2, r0p3 and is 786 still open. 787 788For Neoverse N3, the following errata build flags are defined : 789 790- ``ERRATA_N3_3456111``: This applies errata 3456111 workaround to Neoverse-N3 791 CPU. This needs to be enabled for revisions r0p0 and r0p1 and is still open. 792 793- ``ERRATA_N3_3699563``: This applies errata 3699563 workaround to Neoverse-N3 794 CPU. This needs to be enabled for revisions r0p0 and is still open. 795 796For Cortex-X2, the following errata build flags are defined : 797 798- ``ERRATA_X2_1901946``: This applies errata 1901946 workaround to Cortex-X2 799 CPU. This needs to be enabled only for r1p0, it is fixed in r2p0. 800 801- ``ERRATA_X2_1916945``: This applies errata 1916945 workaround to Cortex-X2 802 CPU. This needs to be enabled only for revisions r0p0 and r1p0 of the CPU, it 803 is fixed in r2p0. 804 805- ``ERRATA_X2_1917258``: This applies errata 1917258 workaround to Cortex-X2 806 CPU. This needs to be enabled only for revisions r0p0 and r1p0 of the CPU, it 807 is fixed in r2p0. 808 809- ``ERRATA_X2_1927200``: This applies errata 1927200 workaround to Cortex-X2 810 CPU. This needs to be enabled only for revisions r0p0 and r1p0 of the CPU, it 811 is fixed in r2p0. 812 813- ``ERRATA_X2_1934260``: This applies errata 1934260 workaround to Cortex-X2 814 CPU. This needs to be enabled only for revision r1p0 of the CPU, it is fixed 815 in r2p0. 816 817- ``ERRATA_X2_2002765``: This applies errata 2002765 workaround to Cortex-X2 818 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the 819 CPU, it is fixed in r2p1. 820 821- ``ERRATA_X2_2017096``: This applies errata 2017096 workaround to Cortex-X2 822 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the 823 CPU, it is fixed in r2p1. 824 825- ``ERRATA_X2_2081180``: This applies errata 2081180 workaround to Cortex-X2 826 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the 827 CPU, it is fixed in r2p1. 828 829- ``ERRATA_X2_2083908``: This applies errata 2083908 workaround to Cortex-X2 830 CPU. This needs to be enabled only for revision r2p0 of the CPU, it is fixed 831 in r2p1. 832 833- ``ERRATA_X2_2136059``: This applies errata 2136059 workaround to Cortex-X2 834 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the 835 CPU, it is fixed in r2p1. 836 837- ``ERRATA_X2_2147715``: This applies errata 2147715 workaround to Cortex-X2 838 CPU. This needs to be enabled only for revision r2p0 of the CPU, it is fixed 839 in r2p1. 840 841- ``ERRATA_X2_2216384``: This applies errata 2216384 workaround to Cortex-X2 842 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the 843 CPU, it is fixed in r2p1. 844 845- ``ERRATA_X2_2267065``: This applies errata 2267065 workaround to Cortex-X2 846 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the 847 CPU, it is fixed in r2p1. 848 849- ``ERRATA_X2_2282622``: This applies errata 2282622 workaround to Cortex-X2 850 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the 851 CPU and is still open. 852 853- ``ERRATA_X2_2291219``: This applies errata 2291219 workaround to Cortex-X2 854 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the 855 CPU, it is fixed in r2p1. 856 857- ``ERRATA_X2_2371105``: This applies errata 2371105 workaround to Cortex-X2 858 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the 859 CPU, it is fixed in r2p1. 860 861- ``ERRATA_X2_2701952``: This applies errata 2701952 workaround to Cortex-X2 862 CPU and affects system configurations that do not use an Arm interconnect IP. 863 This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 and is 864 still open. 865 866- ``ERRATA_X2_2742423``: This applies errata 2742423 workaround to Cortex-X2 867 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the 868 CPU and is still open. 869 870- ``ERRATA_X2_2768515``: This applies errata 2768515 workaround to Cortex-X2 871 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the 872 CPU and is still open. 873 874- ``ERRATA_X2_2778471``: This applies errata 2778471 workaround to Cortex-X2 875 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the 876 CPU and is still open. 877 878- ``ERRATA_X2_3324338``: This applies errata 3324338 workaround to Cortex-X2 879 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the 880 CPU and is still open. 881 882- ``ERRATA_X2_3701772``: This applies errata 3701772 workaround to Cortex-X2 883 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the 884 CPU and is still open. 885 886For Cortex-X3, the following errata build flags are defined : 887 888- ``ERRATA_X3_2266875``: This applies errata 2266875 workaround to the Cortex-X3 889 CPU. This needs to be enabled only for revisions r0p0 and r1p0 of the CPU, it 890 is fixed in r1p1. 891 892- ``ERRATA_X3_2302506``: This applies errata 2302506 workaround to the Cortex-X3 893 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r1p1, it is 894 fixed in r1p2. 895 896- ``ERRATA_X3_2313909``: This applies errata 2313909 workaround to 897 Cortex-X3 CPU. This needs to be enabled only for revisions r0p0 and r1p0 898 of the CPU, it is fixed in r1p1. 899 900- ``ERRATA_X3_2372204``: This applies errata 2372204 workaround to 901 Cortex-X3 CPU. This needs to be enabled only for revisions r0p0 and r1p0 902 of the CPU, it is fixed in r1p1. 903 904- ``ERRATA_X3_2615812``: This applies errata 2615812 workaround to Cortex-X3 905 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r1p1 of the 906 CPU, it is fixed in r1p2. 907 908- ``ERRATA_X3_2641945``: This applies errata 2641945 workaround to Cortex-X3 909 CPU. This needs to be enabled only for revisions r0p0 and r1p0 of the CPU. 910 It is fixed in r1p1. 911 912- ``ERRATA_X3_2701951``: This applies erratum 2701951 workaround to Cortex-X3 913 CPU and affects system configurations that do not use an ARM interconnect 914 IP. This needs to be applied to revisions r0p0, r1p0 and r1p1. It is fixed 915 in r1p2. 916 917- ``ERRATA_X3_2742421``: This applies errata 2742421 workaround to 918 Cortex-X3 CPU. This needs to be enabled only for revisions r0p0, r1p0 and 919 r1p1. It is fixed in r1p2. 920 921- ``ERRATA_X3_2743088``: This applies errata 2743088 workaround to Cortex-X3 922 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r1p1. It is 923 fixed in r1p2. 924 925- ``ERRATA_X3_2779509``: This applies errata 2779509 workaround to Cortex-X3 926 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r1p1 of the 927 CPU. It is fixed in r1p2. 928 929- ``ERRATA_X3_3213672``: This applies errata 3213672 workaround to Cortex-X3 930 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1 and r1p2 931 of the CPU. It is still open. 932 933- ``ERRATA_X3_3692984``: This applies errata 3692984 workaround to Cortex-X3 934 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1 and r1p2 935 of the CPU. It is still open. 936 937- ``ERRATA_X3_3701769``: This applies errata 3701769 workaround to Cortex-X3 938 CPU. This needs to be enabled only for revisions r0p0, r1p0, r1p1 and r1p2 939 of the CPU and it is still open. 940 941- ``ERRATA_X3_3827463``: This applies errata 3827463 workaround to Cortex-X3 942 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r1p1 of 943 the CPU. It is fixed in r1p2. 944 945For Cortex-X4, the following errata build flags are defined : 946 947- ``ERRATA_X4_2701112``: This applies erratum 2701112 workaround to Cortex-X4 948 CPU and affects system configurations that do not use an Arm interconnect IP. 949 This needs to be enabled for revisions r0p0 and is fixed in r0p1. 950 The workaround for this erratum is not implemented in EL3, but the flag can 951 be enabled/disabled at the platform level. The flag is used when the errata ABI 952 feature is enabled and can assist the Kernel in the process of 953 mitigation of the erratum. 954 955- ``ERRATA_X4_2726228``: This applies erratum 2726228 workaround to Cortex-X4 956 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in 957 r0p2. 958 959- ``ERRATA_X4_2740089``: This applies errata 2740089 workaround to Cortex-X4 960 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed 961 in r0p2. 962 963- ``ERRATA_X4_2763018``: This applies errata 2763018 workaround to Cortex-X4 964 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in r0p2. 965 966- ``ERRATA_X4_2816013``: This applies errata 2816013 workaround to Cortex-X4 967 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in r0p2. 968 969- ``ERRATA_X4_2897503``: This applies errata 2897503 workaround to Cortex-X4 970 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in r0p2. 971 972- ``ERRATA_X4_2923985``: This applies errata 2923985 workaround to Cortex-X4 973 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in r0p2. 974 975- ``ERRATA_X4_2957258``: This applies errata 2957258 workaround to Cortex-X4 976 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in r0p2. 977 978- ``ERRATA_X4_3076789``: This applies errata 3076789 workaround to Cortex-X4 979 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in r0p2. 980 981- ``ERRATA_X4_3133195``: This applies errata 3133195 workaround to Cortex-X4 982 CPU. This needs to be enabled for revision r0p2. It is fixed in r0p3. 983 984- ``ERRATA_X4_3701758``: This applies errata 3701758 workaround to Cortex-X4 985 CPU. This needs to be enabled for revisions r0p0, r0p1, r0p2 and r0p3. 986 It is still open. 987 988- ``ERRATA_X4_3887999``: This applies errata 3887999 workaround to Cortex-X4 989 CPU. This needs to be enabled for revision r0p0, r0p1, r0p2 and r0p3. 990 It is still open. 991 992For Cortex-X925, the following errata build flags are defined : 993 994- ``ERRATA_X925_2963999``: This applies errata 2963999 workaround to Cortex-X925 995 CPU. This needs to be enabled for revision r0p0. It is fixed in r0p1. 996 997- ``ERRATA_X925_3701747``: This applies errata 3701747 workaround to Cortex-X925 998 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is still open. 999 1000For Cortex-A510, the following errata build flags are defined : 1001 1002- ``ERRATA_A510_2008766``: This applies errata 2008766 workaround to 1003 Cortex-A510 CPU. This needs to be enabled for revisions r0p0, r0p1, r0p2, 1004 r0p3, r1p0, r1p1, r1p2 and r1p3. It is still open. 1005 1006- ``ERRATA_A510_2288014``: This applies errata 2288014 workaround to 1007 Cortex-A510 CPU. This needs to be enabled only for revisions r0p0, r0p1, 1008 r0p2, r0p3 and r1p0, it is fixed in r1p1. 1009 1010- ``ERRATA_A510_2042739``: This applies errata 2042739 workaround to 1011 Cortex-A510 CPU. This needs to be enabled only for revisions r0p0, r0p1 and 1012 r0p2, it is fixed in r0p3. 1013 1014- ``ERRATA_A510_2041909``: This applies errata 2041909 workaround to 1015 Cortex-A510 CPU. This needs to be enabled only for revision r0p2 and is fixed 1016 in r0p3. The issue is also present in r0p0 and r0p1 but there is no 1017 workaround for those revisions. 1018 1019- ``ERRATA_A510_2080326``: This applies errata 2080326 workaround to 1020 Cortex-A510 CPU. This needs to be enabled only for revision r0p2 and is 1021 fixed in r0p3. This issue is also present in r0p0 and r0p1 but there is no 1022 workaround for those revisions. 1023 1024- ``ERRATA_A510_2169012``: This applies errata 2169012 workaround to 1025 Cortex-A510 CPU. This needs to be enabled only for revisions r0p0, r0p1, 1026 r0p2, r0p3 and r1p0, it is fixed in r1p1. 1027 1028- ``ERRATA_A510_2218134``: This applies errata 2218134 workaround to 1029 Cortex-A510 CPU. This needs to be enabled only for revision r1p0 and is fixed 1030 in r1p1. 1031 1032- ``ERRATA_A510_2250311``: This applies errata 2250311 workaround to 1033 Cortex-A510 CPU. This needs to be enabled for revisions r0p0, r0p1, r0p2, 1034 r0p3 and r1p0, it is fixed in r1p1. This workaround disables MPMM even if 1035 ENABLE_MPMM=1. 1036 1037- ``ERRATA_A510_2218950``: This applies errata 2218950 workaround to 1038 Cortex-A510 CPU. This needs to be enabled for revisions r0p0, r0p1, r0p2, 1039 r0p3 and r1p0, it is fixed in r1p1. 1040 1041- ``ERRATA_A510_2172148``: This applies errata 2172148 workaround to 1042 Cortex-A510 CPU. This needs to be enabled for revisions r0p0, r0p1, r0p2, 1043 r0p3 and r1p0, it is fixed in r1p1. 1044 1045- ``ERRATA_A510_2347730``: This applies errata 2347730 workaround to 1046 Cortex-A510 CPU. This needs to be enabled for revisions r0p0, r0p1, r0p2, 1047 r0p3, r1p0 and r1p1. It is fixed in r1p2. 1048 1049- ``ERRATA_A510_2371937``: This applies errata 2371937 workaround to 1050 Cortex-A510 CPU. This needs to applied for revisions r0p0, r0p1, r0p2, 1051 r0p3, r1p0, r1p1, and is fixed in r1p2. 1052 1053- ``ERRATA_A510_2420992``: This applies errata 2420992 workaround to 1054 Cortex-A510 CPU. This needs to applied for revisions r1p0 and r1p1, and is 1055 fixed in r1p2. 1056 1057- ``ERRATA_A510_2666669``: This applies errata 2666669 workaround to 1058 Cortex-A510 CPU. This needs to applied for revisions r0p0, r0p1, r0p2, 1059 r0p3, r1p0, r1p1. It is fixed in r1p2. 1060 1061- ``ERRATA_A510_2684597``: This applies erratum 2684597 workaround to 1062 Cortex-A510 CPU. This needs to be applied to revision r0p0, r0p1, r0p2, 1063 r0p3, r1p0, r1p1 and r1p2. It is fixed in r1p3. 1064 1065- ``ERRATA_A510_2971420``: This applies erratum 2971420 workaround to 1066 Cortex-A510 CPU. This needs to be applied to revisions r0p1, r0p2, r0p3, 1067 r1p0, r1p1, r1p2 and r1p3 and is still open. 1068 1069- ``ERRATA_A510_3672349``: This applies erratum 3672349 workaround to 1070 Cortex-A510 CPU. This needs to be applied to revisions r0p1, r0p2, r0p3, 1071 r1p0, r1p1, r1p2 and r1p3 and is still open. 1072 1073- ``ERRATA_A510_3704847``: This applies erratum 3704847 workaround to 1074 Cortex-A510 CPU. This needs to be applied to revisions r0p1, r0p2, r0p3, 1075 r1p0, r1p1, r1p2 and r1p3 and is still open. 1076 1077For Cortex-A520, the following errata build flags are defined : 1078 1079- ``ERRATA_A520_2630792``: This applies errata 2630792 workaround to 1080 Cortex-A520 CPU. This needs to applied for revisions r0p0, r0p1 of the 1081 CPU and is still open. 1082 1083- ``ERRATA_A520_2858100``: This applies errata 2858100 workaround to 1084 Cortex-A520 CPU. This needs to be enabled for revisions r0p0 and r0p1. 1085 It is still open. 1086 1087- ``ERRATA_A520_2938996``: This applies errata 2938996 workaround to 1088 Cortex-A520 CPU. This needs to be enabled for revisions r0p0 and r0p1. 1089 It is fixed in r0p2. 1090 1091For Cortex-A715, the following errata build flags are defined : 1092 1093- ``ERRATA_A715_2331818``: This applies errata 2331818 workaround to 1094 Cortex-A715 CPU. This needs to be enabled for revisions r0p0 and r1p0. 1095 It is fixed in r1p1. 1096 1097- ``ERRATA_A715_2344187``: This applies errata 2344187 workaround to 1098 Cortex-A715 CPU. This needs to be enabled for revisions r0p0 and r1p0. It is 1099 fixed in r1p1. 1100 1101- ``ERRATA_A715_2376701``: This applies errata 2376701 workaround to 1102 Cortex-A715 CPU. This needs to be enabled for revisions r0p0 and r1p0. It is 1103 fixed in r1p1. 1104 1105- ``ERRATA_A715_2409570``: This applies errata 2409570 workaround to 1106 Cortex-A715 CPU. This needs to be enabled only for revision r1p0. 1107 It is fixed in r1p1. This errata also applies to r0p0 but that revision has a 1108 different workaround, and since r0p0 is not used in production hardware it is 1109 not implemented. 1110 1111- ``ERRATA_A715_2413290``: This applies errata 2413290 workaround to 1112 Cortex-A715 CPU. This needs to be enabled only for revision r1p0 and 1113 when SPE(Statistical profiling extension)=True. The errata is fixed 1114 in r1p1. 1115 1116- ``ERRATA_A715_2420947``: This applies errata 2420947 workaround to 1117 Cortex-A715 CPU. This needs to be enabled only for revision r1p0. 1118 It is fixed in r1p1. 1119 1120- ``ERRATA_A715_2429384``: This applies errata 2429384 workaround to 1121 Cortex-A715 CPU. This needs to be enabled for revision r1p0. There is no 1122 workaround for revision r0p0. It is fixed in r1p1. 1123 1124- ``ERRATA_A715_2561034``: This applies errata 2561034 workaround to 1125 Cortex-A715 CPU. This needs to be enabled only for revision r1p0. 1126 It is fixed in r1p1. 1127 1128- ``ERRATA_A715_2728106``: This applies errata 2728106 workaround to 1129 Cortex-A715 CPU. This needs to be enabled for revisions r0p0, r1p0 1130 and r1p1. It is fixed in r1p2. 1131 1132- ``ERRATA_A715_2804830``: This applies errata 2804830 workaround to 1133 Cortex-A715 CPU. This needs to be enabled for revisions r0p0, r1p0, 1134 r1p1 and r1p2. It is fixed in r1p3. 1135 1136- ``ERRATA_A715_3456084``: This applies errata 3456084 workaround to 1137 Cortex-A715 CPU. This needs to be enabled for revisions r0p0, r1p0, 1138 r1p1, r1p2 and r1p3. It is still open. 1139 1140- ``ERRATA_A715_3699560``: This applies errata 3699560 workaround to 1141 Cortex-A715 CPU. This needs to be enabled for revisions r0p0, r1p0, 1142 r1p2 and r1p3. It is still open. 1143 1144- ``ERRATA_A715_3711916``: This applies errata 3711916 workaround to 1145 Cortex-A715 CPU. This needs to be enabled for revisions r0p0, r1p0, 1146 r1p1, r1p2 and r1p3. It is still open. 1147 1148For Cortex-A720, the following errata build flags are defined : 1149 1150- ``ERRATA_A720_2729604``: This applies errata 2729604 workaround to 1151 Cortex-A720 CPU. This needs to be enabled for revisions r0p0 and r0p1. 1152 It is fixed in r0p2. 1153 1154- ``ERRATA_A720_2792132``: This applies errata 2792132 workaround to 1155 Cortex-A720 CPU. This needs to be enabled for revisions r0p0 and r0p1. 1156 It is fixed in r0p2. 1157 1158- ``ERRATA_A720_2844092``: This applies errata 2844092 workaround to 1159 Cortex-A720 CPU. This needs to be enabled for revisions r0p0 and r0p1. 1160 It is fixed in r0p2. 1161 1162- ``ERRATA_A720_2926083``: This applies errata 2926083 workaround to 1163 Cortex-A720 CPU. This needs to be enabled for revisions r0p0 and r0p1. 1164 It is fixed in r0p2. 1165 1166- ``ERRATA_A720_2940794``: This applies errata 2940794 workaround to 1167 Cortex-A720 CPU. This needs to be enabled for revisions r0p0 and r0p1. 1168 It is fixed in r0p2. 1169 1170- ``ERRATA_A720_3456091``: This applies errata 3456091 workaround to 1171 Cortex-A720 CPU. This needs to be enabled for revisions r0p0, r0p1 1172 and r0p2. It is still open. 1173 1174- ``ERRATA_A720_3699561``: This applies errata 3699561 workaround to 1175 Cortex-A720 CPU. This needs to be enabled for revisions r0p0, r0p1 1176 and r0p2. It is still open. 1177 1178- ``ERRATA_A720_3711910``: This applies errata 3711910 workaround to 1179 Cortex-A720 CPU. This needs to be enabled for revisions r0p0, r0p1 1180 and r0p2. It is still open. 1181 1182For Cortex-A720_AE, the following errata build flags are defined : 1183 1184- ``ERRATA_A720_AE_3456103``: This applies errata 3456103 workaround to 1185 Cortex-A720_AE CPU. This needs to be enabled for revisions r0p0 and r0p1. It 1186 is still open. 1187 1188- ``ERRATA_A720_AE_3699562``: This applies errata 3699562 workaround 1189 to Cortex-A720_AE CPU. This needs to be enabled for revisions r0p0. 1190 It is still open. 1191 1192For Cortex-A725, the following errata build flags are defined : 1193 1194- ``ERRATA_A725_2874943``: This applies errata 2874943 workaround to 1195 Cortex-A725 CPU. This needs to be enabled for revisions r0p0 when 1196 FEAT_SPE is enabled. It is fixed in r0p1. 1197 1198- ``ERRATA_A725_2936490``: This applies errata 2936490 workaround to 1199 Cortex-A725 CPU. This needs to be enabled for revisions r0p0. 1200 It is fixed in r0p1. 1201 1202- ``ERRATA_A725_3456106``: This applies errata 3456106 workaround to 1203 Cortex-A725 CPU. This needs to be enabled for revisions r0p0, r0p1 1204 and r0p2. It is still open. 1205 1206- ``ERRATA_A725_3699564``: This applies errata 3699564 workaround to 1207 Cortex-A725 CPU. This needs to be enabled for revisions r0p0 and r0p1. 1208 It is fixed in r0p2. 1209 1210- ``ERRATA_A725_3711914``: This applies errata 3711914 workaround to 1211 Cortex-A725 CPU. This needs to be enabled for revisions r0p0 and r0p1. 1212 It is fixed in r0p2. 1213 1214For C1-Ultra, the following errata build flags are defined : 1215 1216- ``ERRATA_C1ULTRA_3324333``: This applies erratum 3324333 workaround to 1217 C1-Ultra CPU. This needs to be enabled for revision r0p0 and is fixed 1218 in r1p0. 1219 1220- ``ERRATA_C1ULTRA_3502731``: This applies erratum 3502731 workaround to 1221 C1-Ultra CPU. This needs to be enabled for revision r0p0 and is 1222 fixed in r1p0. 1223 1224- ``ERRATA_C1ULTRA_3651221``: This applies erratum 3651221 workaround to 1225 C1-Ultra CPU. This needs to be enabled for revision r0p0 and is 1226 fixed in r1p0. 1227 1228- ``ERRATA_C1ULTRA_3658374``: This applies erratum 3658374 workaround to 1229 C1-Ultra CPU. This needs to be enabled for revisions r0p0 and r1p0 and 1230 is still open. 1231 1232- ``ERRATA_C1ULTRA_3684152``: This applies erratum 3684152 workaround to 1233 C1-Ultra CPU. This needs to be enabled for revision r0p0 and is 1234 fixed in r1p0. 1235 1236- ``ERRATA_C1ULTRA_3705939``: This applies erratum 3705939 workaround to 1237 C1-Ultra CPU. This needs to be enabled for revisions r0p0 and r1p0 and 1238 is still open. 1239 1240- ``ERRATA_C1ULTRA_3815514``: This applies erratum 3815514 workaround to 1241 C1-Ultra CPU. This needs to be enabled for revisions r0p0 and r1p0 and 1242 is still open. 1243 1244- ``ERRATA_C1ULTRA_3865171``: This applies erratum 3865171 workaround to 1245 C1-Ultra CPU. This needs to be enabled for revisions r0p0 and r1p0 and 1246 is still open. 1247 1248- ``ERRATA_C1ULTRA_3926381``: This applies erratum 3926381 workaround to 1249 C1-Ultra CPU. This needs to be enabled for revision r1p0 and is still 1250 open. 1251 1252- ``ERRATA_C1ULTRA_4102704``: This applies erratum 4102704 workaround to 1253 C1-Ultra CPU. This needs to be enabled for revisions r0p0 and r1p0 and 1254 is still open. 1255 1256For C1-Premium, the following errata build flags are defined : 1257 1258- ``ERRATA_C1PREMIUM_3324333``: This applies errata 3324333 workaround to 1259 C1-Premium CPU. This needs to be enabled for revision r0p0, and is 1260 fixed in r1p0. 1261 1262- ``ERRATA_C1PREMIUM_3502731``: This applies errata 3502731 workaround to 1263 C1-Premium CPU. This needs to be enabled for revision r0p0, and is fixed 1264 in r1p0. 1265 1266- ``ERRATA_C1PREMIUM_3651221``: This applies errata 3651221 workaround to 1267 C1-Premium CPU. This needs to be enabled for revision r0p0, and is fixed 1268 in r1p0. 1269 1270- ``ERRATA_C1PREMIUM_3684152``: This applies errata 3684152 workaround to 1271 C1-Premium CPU. This needs to be enabled for revision r0p0, and is fixed 1272 in r1p0. 1273 1274- ``ERRATA_C1PREMIUM_3705939``: This applies errata 3705939 workaround to 1275 C1-Premium CPU. This needs to be enabled for revisions r0p0, r1p0 and 1276 is still open. 1277 1278- ``ERRATA_C1PREMIUM_3815514``: This applies errata 3815514 workaround to 1279 C1-Premium CPU. This needs to be enabled for revisions r0p0, r1p0 and 1280 is still open. 1281 1282- ``ERRATA_C1PREMIUM_3865171``: This applies errata 3865171 workaround to 1283 C1-Premium CPU. This needs to be enabled for revisions r0p0, r1p0 and 1284 is still open. 1285 1286- ``ERRATA_C1PREMIUM_3926381``: This applies errata 3926381 workaround to 1287 C1-Premium CPU. This needs to be enabled for revision r1p0 and is 1288 still open. 1289 1290- ``ERRATA_C1PREMIUM_4102704``: This applies errata 4102704 workaround to 1291 C1-Premium CPU. This needs to be enabled for revisions r0p0, r1p0 and 1292 is still open. 1293 1294For C1-Pro, the following errata build flags are defined : 1295 1296- ``ERRATA_C1PRO_3619847``: This applies errata 3619847 workaround to C1-Pro 1297 CPU. This needs to be enabled only for revision r0p0 and is fixed in r1p0. 1298 1299- ``ERRATA_C1PRO_3338470``: This applies errata 3338470 workaround to C1-Pro 1300 CPU. This needs to be enabled only for revision r0p0 and is fixed in r1p0. 1301 1302- ``ERRATA_C1PRO_3362007``: This applies errata 3362007 workaround to C1-Pro 1303 CPU. This needs to be enabled only for revision r0p0 and is fixed in r1p0. 1304 1305- ``ERRATA_C1PRO_3684268``: This applies errata 3684268 workaround to C1-Pro 1306 CPU. This needs to be enabled for revisions r0p0, r1p0 and is fixed in 1307 r1p1. 1308 1309- ``ERRATA_C1PRO_3686597``: This applies errata 3686597 workaround to C1-Pro 1310 CPU. This needs to be enabled for revisions r0p0 and r1p0 of the CPU, it 1311 is fixed in r1p1. 1312 1313- ``ERRATA_C1PRO_3694158``: This applies errata 3694158 workaround to C1-Pro 1314 CPU. This needs to be enabled for revisions r0p0, r1p0 and r1p1 and is 1315 fixed in r1p2. 1316 1317- ``ERRATA_C1PRO_3706576``: This applies errata 3706576 workaround to C1-Pro 1318 CPU. This needs to be enabled for revisions r0p0 and r1p0 of the CPU, it 1319 is fixed in r1p1. 1320 1321- ``ERRATA_C1PRO_3300099``: This applies errata 3300099 workaround to C1-Pro 1322 CPU. This needs to be enabled for revisions r0p0 and r1p0 of the CPU, it 1323 is fixed in r1p1. 1324 1325DSU Errata Workarounds 1326---------------------- 1327 1328Similar to CPU errata, TF-A also implements workarounds for DSU (DynamIQ 1329Shared Unit) errata. The DSU errata details can be found in the respective Arm 1330documentation: 1331 1332- `Arm DSU Software Developers Errata Notice`_. 1333 1334Each erratum is identified by an ``ID``, as defined in the DSU errata notice 1335document. Thus, the build flags which enable/disable the errata workarounds 1336have the format ``ERRATA_DSU_<ID>``. The implementation and application logic 1337of DSU errata workarounds are similar to `CPU errata workarounds`_. 1338 1339For DSU errata, the following build flags are defined: 1340 1341- ``ERRATA_DSU_798953``: This applies errata 798953 workaround for the 1342 affected DSU configurations. This errata applies only for those DSUs that 1343 revision is r0p0 (on r0p1 it is fixed). However, please note that this 1344 workaround results in increased DSU power consumption on idle. 1345 1346- ``ERRATA_DSU_936184``: This applies errata 936184 workaround for the 1347 affected DSU configurations. This errata applies only for those DSUs that 1348 contain the ACP interface **and** the DSU revision is older than r2p0 (on 1349 r2p0 it is fixed). However, please note that this workaround results in 1350 increased DSU power consumption on idle. 1351 1352- ``ERRATA_DSU_2313941``: This applies errata 2313941 workaround for the 1353 affected DSU configurations. This errata applies for those DSUs with 1354 revisions r0p0, r1p0, r2p0, r2p1, r3p0, r3p1 and is still open. However, 1355 please note that this workaround results in increased DSU power consumption 1356 on idle. 1357 1358- ``ERRATA_DSU_2900952``: This applies errata 2900952 workaround for the 1359 affected DSU-120 configurations. This erratum applies to some r2p0 1360 implementations and is fixed in r2p1. The affected r2p0 implementations 1361 are determined by reading the IMP_CLUSTERREVIDR_EL1[1] register bit 1362 and making sure it's clear. 1363 1364CPU Specific optimizations 1365-------------------------- 1366 1367This section describes some of the optimizations allowed by the CPU micro 1368architecture that can be enabled by the platform as desired. 1369 1370- ``SKIP_A57_L1_FLUSH_PWR_DWN``: This flag enables an optimization in the 1371 Cortex-A57 cluster power down sequence by not flushing the Level 1 data 1372 cache. The L1 data cache and the L2 unified cache are inclusive. A flush 1373 of the L2 by set/way flushes any dirty lines from the L1 as well. This 1374 is a known safe deviation from the Cortex-A57 TRM defined power down 1375 sequence. Each Cortex-A57 based platform must make its own decision on 1376 whether to use the optimization. 1377 1378- ``A53_DISABLE_NON_TEMPORAL_HINT``: This flag disables the cache non-temporal 1379 hint. The LDNP/STNP instructions as implemented on Cortex-A53 do not behave 1380 in a way most programmers expect, and will most probably result in a 1381 significant speed degradation to any code that employs them. The Armv8-A 1382 architecture (see Arm DDI 0487A.h, section D3.4.3) allows cores to ignore 1383 the non-temporal hint and treat LDNP/STNP as LDP/STP instead. Enabling this 1384 flag enforces this behaviour. This needs to be enabled only for revisions 1385 <= r0p3 of the CPU and is enabled by default. 1386 1387- ``A57_DISABLE_NON_TEMPORAL_HINT``: This flag has the same behaviour as 1388 ``A53_DISABLE_NON_TEMPORAL_HINT`` but for Cortex-A57. This needs to be 1389 enabled only for revisions <= r1p2 of the CPU and is enabled by default, 1390 as recommended in section "4.7 Non-Temporal Loads/Stores" of the 1391 `Cortex-A57 Software Optimization Guide`_. 1392 1393- ''A57_ENABLE_NON_CACHEABLE_LOAD_FWD'': This flag enables non-cacheable 1394 streaming enhancement feature for Cortex-A57 CPUs. Platforms can set 1395 this bit only if their memory system meets the requirement that cache 1396 line fill requests from the Cortex-A57 processor are atomic. Each 1397 Cortex-A57 based platform must make its own decision on whether to use 1398 the optimization. This flag is disabled by default. 1399 1400- ``NEOVERSE_Nx_EXTERNAL_LLC``: This flag indicates that an external last 1401 level cache(LLC) is present in the system, and that the DataSource field 1402 on the master CHI interface indicates when data is returned from the LLC. 1403 This is used to control how the LL_CACHE* PMU events count. 1404 Default value is 0 (Disabled). 1405 1406- ``NEOVERSE_N2_PREFETCHER_DISABLE``: This flag disables the region prefetcher 1407 on the Neoverse N2 core. This is used during performance analysis to get clean 1408 and repeatable measurements of the cache by preventing speculative data fetches 1409 from interfering with benchmark results. 1410 Default value is 0 (Disabled). 1411 1412GIC Errata Workarounds 1413---------------------- 1414- ``GIC600_ERRATA_WA_2384374``: This flag applies part 2 of errata 2384374 1415 workaround for the affected GIC600 and GIC600-AE implementations. It applies 1416 to implementations of GIC600 and GIC600-AE with revisions less than or equal 1417 to r1p6 and r0p2 respectively. If the platform sets GICV3_SUPPORT_GIC600, 1418 then this flag is enabled; otherwise, it is 0 (Disabled). 1419 1420-------------- 1421 1422*Copyright (c) 2014-2025, Arm Limited and Contributors. All rights reserved.* 1423 1424.. _CVE-2017-5715: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5715 1425.. _CVE-2018-3639: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3639 1426.. _CVE-2022-23960: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-23960 1427.. _CVE-2024-5660: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-5660 1428.. _CVE-2024-7881: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-7881 1429.. _Cortex-A72 MPCore Software Developers Errata Notice: https://developer.arm.com/documentation/epm012079/latest 1430.. _Cortex-A57 Software Optimization Guide: https://developer.arm.com/documentation/uan0015 1431.. _Arm DSU Software Developers Errata Notice: https://developer.arm.com/documentation/SDEN854652 1432