1Arm Development Platform Build Options 2====================================== 3 4Arm Platform Build Options 5-------------------------- 6 7- ``ARM_BL31_IN_DRAM``: Boolean option to select loading of BL31 in TZC secured 8 DRAM. By default, BL31 is in the secure SRAM. Set this flag to 1 to load 9 BL31 in TZC secured DRAM. If TSP is present, then setting this option also 10 sets the TSP location to DRAM and ignores the ``ARM_TSP_RAM_LOCATION`` build 11 flag. 12 13- ``ARM_CONFIG_CNTACR``: boolean option to unlock access to the ``CNTBase<N>`` 14 frame registers by setting the ``CNTCTLBase.CNTACR<N>`` register bits. The 15 frame number ``<N>`` is defined by ``PLAT_ARM_NSTIMER_FRAME_ID``, which 16 should match the frame used by the Non-Secure image (normally the Linux 17 kernel). Default is true (access to the frame is allowed). 18 19- ``ARM_DISABLE_TRUSTED_WDOG``: boolean option to disable the Trusted Watchdog. 20 By default, Arm platforms use a watchdog to trigger a system reset in case 21 an error is encountered during the boot process (for example, when an image 22 could not be loaded or authenticated). The watchdog is enabled in the early 23 platform setup hook at BL1 and disabled in the BL1 prepare exit hook. The 24 Trusted Watchdog may be disabled at build time for testing or development 25 purposes. 26 27- ``ARM_LINUX_KERNEL_AS_BL33``: The Linux kernel expects registers x0-x3 to 28 have specific values at boot. This boolean option allows the Trusted Firmware 29 to have a Linux kernel image as BL33 by preparing the registers to these 30 values before jumping to BL33. This option defaults to 0 (disabled). For 31 AArch64 ``RESET_TO_BL31`` and for AArch32 ``RESET_TO_SP_MIN`` must be 1 when 32 using it. If this option is set to 1, ``ARM_PRELOADED_DTB_BASE`` must be set 33 to the location of a device tree blob (DTB) already loaded in memory. The 34 Linux Image address must be specified using the ``PRELOADED_BL33_BASE`` 35 option. 36 37- ``ARM_PLAT_MT``: This flag determines whether the Arm platform layer has to 38 cater for the multi-threading ``MT`` bit when accessing MPIDR. When this flag 39 is set, the functions which deal with MPIDR assume that the ``MT`` bit in 40 MPIDR is set and access the bit-fields in MPIDR accordingly. Default value of 41 this flag is 0. Note that this option is not used on FVP platforms. 42 43- ``ARM_RECOM_STATE_ID_ENC``: The PSCI1.0 specification recommends an encoding 44 for the construction of composite state-ID in the power-state parameter. 45 The existing PSCI clients currently do not support this encoding of 46 State-ID yet. Hence this flag is used to configure whether to use the 47 recommended State-ID encoding or not. The default value of this flag is 0, 48 in which case the platform is configured to expect NULL in the State-ID 49 field of power-state parameter. 50 51- ``ARM_ROTPK_LOCATION``: used when ``TRUSTED_BOARD_BOOT=1``. It specifies the 52 location of the ROTPK hash returned by the function ``plat_get_rotpk_info()`` 53 for Arm platforms. Depending on the selected option, the proper private key 54 must be specified using the ``ROT_KEY`` option when building the Trusted 55 Firmware. This private key will be used by the certificate generation tool 56 to sign the BL2 and Trusted Key certificates. Available options for 57 ``ARM_ROTPK_LOCATION`` are: 58 59 - ``regs`` : return the ROTPK hash stored in the Trusted root-key storage 60 registers. The private key corresponding to this ROTPK hash is not 61 currently available. 62 - ``devel_rsa`` : return a development public key hash embedded in the BL1 63 and BL2 binaries. This hash has been obtained from the RSA public key 64 ``arm_rotpk_rsa.der``, located in ``plat/arm/board/common/rotpk``. To use 65 this option, ``arm_rotprivk_rsa.pem`` must be specified as ``ROT_KEY`` 66 when creating the certificates. 67 - ``devel_ecdsa`` : return a development public key hash embedded in the BL1 68 and BL2 binaries. This hash has been obtained from the ECDSA public key 69 ``arm_rotpk_ecdsa.der``, located in ``plat/arm/board/common/rotpk``. To 70 use this option, ``arm_rotprivk_ecdsa.pem`` must be specified as 71 ``ROT_KEY`` when creating the certificates. 72 73- ``ARM_TSP_RAM_LOCATION``: location of the TSP binary. Options: 74 75 - ``tsram`` : Trusted SRAM (default option when TBB is not enabled) 76 - ``tdram`` : Trusted DRAM (if available) 77 - ``dram`` : Secure region in DRAM (default option when TBB is enabled, 78 configured by the TrustZone controller) 79 80- ``ARM_XLAT_TABLES_LIB_V1``: boolean option to compile TF-A with version 1 81 of the translation tables library instead of version 2. It is set to 0 by 82 default, which selects version 2. 83 84- ``ARM_CRYPTOCELL_INTEG`` : bool option to enable TF-A to invoke Arm® 85 TrustZone® CryptoCell functionality for Trusted Board Boot on capable Arm 86 platforms. If this option is specified, then the path to the CryptoCell 87 SBROM library must be specified via ``CCSBROM_LIB_PATH`` flag. 88 89For a better understanding of these options, the Arm development platform memory 90map is explained in the :ref:`Firmware Design`. 91 92.. _build_options_arm_css_platform: 93 94Arm CSS Platform-Specific Build Options 95--------------------------------------- 96 97- ``CSS_DETECT_PRE_1_7_0_SCP``: Boolean flag to detect SCP version 98 incompatibility. Version 1.7.0 of the SCP firmware made a non-backwards 99 compatible change to the MTL protocol, used for AP/SCP communication. 100 TF-A no longer supports earlier SCP versions. If this option is set to 1 101 then TF-A will detect if an earlier version is in use. Default is 1. 102 103- ``CSS_LOAD_SCP_IMAGES``: Boolean flag, which when set, adds SCP_BL2 and 104 SCP_BL2U to the FIP and FWU_FIP respectively, and enables them to be loaded 105 during boot. Default is 1. 106 107- ``CSS_USE_SCMI_SDS_DRIVER``: Boolean flag which selects SCMI/SDS drivers 108 instead of SCPI/BOM driver for communicating with the SCP during power 109 management operations and for SCP RAM Firmware transfer. If this option 110 is set to 1, then SCMI/SDS drivers will be used. Default is 0. 111 112-------------- 113 114*Copyright (c) 2019, Arm Limited. All rights reserved.* 115