1*4882a593Smuzhiyun 2*4882a593Smuzhiyun U-Boot for ARM Integrator Development Platforms 3*4882a593Smuzhiyun 4*4882a593Smuzhiyun Peter Pearse, ARM Ltd. 5*4882a593Smuzhiyun peter.pearse@arm.com 6*4882a593Smuzhiyun www.arm.com 7*4882a593Smuzhiyun 8*4882a593SmuzhiyunManuals available from :- 9*4882a593Smuzhiyunhttp://www.arm.com/products/DevTools/Hardware_Platforms.html 10*4882a593Smuzhiyun 11*4882a593SmuzhiyunOverview : 12*4882a593Smuzhiyun-------- 13*4882a593SmuzhiyunThere are two Integrator variants - Integrator/AP and Integrator/CP. 14*4882a593SmuzhiyunEach may be fitted with a variety of core modules (CMs). 15*4882a593SmuzhiyunEach CM consists of a ARM processor core and associated hardware e.g 16*4882a593Smuzhiyun FPGA implementing various controllers and/or register 17*4882a593Smuzhiyun SSRAM 18*4882a593Smuzhiyun SDRAM 19*4882a593Smuzhiyun RAM controllers 20*4882a593Smuzhiyun clock generators etc. 21*4882a593SmuzhiyunCMs may be fitted with varying amounts of SDRAM using a DIMM socket. 22*4882a593Smuzhiyun 23*4882a593SmuzhiyunBoot Methods : 24*4882a593Smuzhiyun------------ 25*4882a593SmuzhiyunIntegrator platforms can be configured to use U-Boot in at least three ways :- 26*4882a593Smuzhiyuna) Run ARM boot monitor, manually run U-Boot image from flash 27*4882a593Smuzhiyunb) Run ARM boot monitor, automatically run U-Boot image from flash 28*4882a593Smuzhiyunc) Run U-Boot image direct from flash. 29*4882a593Smuzhiyun 30*4882a593SmuzhiyunIn cases a) and b) the ARM boot monitor will have configured the CM and mapped 31*4882a593Smuzhiyunwriteable memory to 0x00000000 in the Integrator address space. 32*4882a593SmuzhiyunU-Boot has to carry out minimal configration before standard code is run. 33*4882a593Smuzhiyun 34*4882a593SmuzhiyunIn case c) it may be necessary for U-Boot to perform CM dependent initialization. 35*4882a593Smuzhiyun 36*4882a593SmuzhiyunConfiguring U-Boot : 37*4882a593Smuzhiyun------------------ 38*4882a593Smuzhiyun The makefile contains targets for Integrator platforms of both types 39*4882a593Smuzhiyunfitted with all current variants of CM. If these targets are to be used with 40*4882a593Smuzhiyunboot process c) above then CONFIG_INIT_CRITICAL may need to be defined to ensure 41*4882a593Smuzhiyunthat the CM is correctly configured. 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun There are also targets independent of CM. These may not be suitable for 44*4882a593Smuzhiyunboot process c) above. They have been preserved for backward compatibility with 45*4882a593Smuzhiyunexisting build processes. 46*4882a593Smuzhiyun 47*4882a593SmuzhiyunCode Hierarchy Applied : 48*4882a593Smuzhiyun---------------------- 49*4882a593SmuzhiyunCode specific to initialization of a particular ARM processor has been placed in 50*4882a593Smuzhiyuncpu/arm<>/start.S so that it may be used by other boards. 51*4882a593Smuzhiyun 52*4882a593SmuzhiyunHowever, to avoid duplicating code through all processor files, a generic core 53*4882a593Smuzhiyunfor ARM Integrator CMs has been added 54*4882a593Smuzhiyun 55*4882a593Smuzhiyun arch/arm/cpu/arm_intcm 56*4882a593Smuzhiyun 57*4882a593SmuzhiyunOtherwise. for example, the standard CM reset via the CM control register would 58*4882a593Smuzhiyunneed placing in each CM processor file...... 59*4882a593Smuzhiyun 60*4882a593SmuzhiyunCode specific to the initialization of the CM, rather than the cpu, and initialization 61*4882a593Smuzhiyunof the Integrator board itself, has been placed in 62*4882a593Smuzhiyun 63*4882a593Smuzhiyun board/integrator<>/platform.S 64*4882a593Smuzhiyun board/integrator<>/integrator<>.c 65*4882a593Smuzhiyun 66*4882a593SmuzhiyunTargets 67*4882a593Smuzhiyun======= 68*4882a593SmuzhiyunThe U-Boot make targets map to the available core modules as below. 69*4882a593Smuzhiyun 70*4882a593SmuzhiyunIntegrator/AP is no longer available from ARM. 71*4882a593SmuzhiyunCore modules marked ** are also no longer available. 72*4882a593Smuzhiyun 73*4882a593Smuzhiyunap720t_config ** CM720T 74*4882a593Smuzhiyunap920t_config ** CM920T 75*4882a593Smuzhiyunap926ejs_config Integrator Core Module for ARM926EJ-STM 76*4882a593Smuzhiyunap946es_config Integrator Core Module for ARM946E-STM 77*4882a593Smuzhiyuncp920t_config ** CM920T 78*4882a593Smuzhiyuncp926ejs_config Integrator Core Module for ARM926EJ-STM 79*4882a593Smuzhiyuncp946es_config Integrator Core Module for ARM946E-STM 80*4882a593Smuzhiyuncp1136_config Integrator Core Module ARM1136JF-S TM 81*4882a593Smuzhiyun 82*4882a593SmuzhiyunThe final groups of targets are for core modules where no explicit cpu 83*4882a593Smuzhiyuncode has yet been added to U-Boot i.e. they all use the same U-Boot binary 84*4882a593Smuzhiyunusing the generic "arm_intcm" core: 85*4882a593Smuzhiyun 86*4882a593Smuzhiyunap966_config Integrator Core Module for ARM966E-S TM 87*4882a593Smuzhiyunap922_config Integrator Core Module for ARM922T TM with ETM 88*4882a593Smuzhiyunap922_XA10_config Integrator Core Module for ARM922T using Altera Excalibur 89*4882a593Smuzhiyunap7_config ** CM7TDMI 90*4882a593Smuzhiyunintegratorap_config 91*4882a593Smuzhiyunap_config 92*4882a593Smuzhiyun 93*4882a593Smuzhiyun 94*4882a593Smuzhiyuncp966_config Integrator Core Module for ARM966E-S TM 95*4882a593Smuzhiyuncp922_config Integrator Core Module for ARM922T TM with ETM 96*4882a593Smuzhiyuncp922_XA10_config Integrator Core Module for ARM922T using Altera Excalibur 97*4882a593Smuzhiyuncp1026_config Integrator Core Module ARM1026EJ-S TM 98*4882a593Smuzhiyunintegratorcp_config 99*4882a593Smuzhiyuncp_config 100*4882a593Smuzhiyun 101*4882a593SmuzhiyunThe Makefile targets call board/integrator<>/split_by_variant.sh 102*4882a593Smuzhiyunto configure various defines in include/configs/integrator<>.h 103*4882a593Smuzhiyunto indicate the core module & core configuration and ensure that 104*4882a593Smuzhiyunboard/integrator<>/u-boot.lds loads the cpu object first in the U-Boot image. 105*4882a593Smuzhiyun 106*4882a593Smuzhiyun********************************* 107*4882a593SmuzhiyunBecause of this mechanism 108*4882a593Smuzhiyun> make clean 109*4882a593Smuzhiyunmust be run before each change in configuration 110*4882a593Smuzhiyun********************************* 111