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diff --git a/doc/README-integrator b/doc/README-integrator new file mode 100644 index 0000000..ce8a9d2 --- /dev/null +++ b/doc/README-integrator @@ -0,0 +1,110 @@ + + U-Boot for ARM Integrator Development Platforms + + Peter Pearse, ARM Ltd. + peter.pearse@arm.com + www.arm.com + +Manuals available from :- +http://www.arm.com/products/DevTools/Hardware_Platforms.html + +Overview : +-------- +There are two Integrator variants - Integrator/AP and Integrator/CP. +Each may be fitted with a variety of core modules (CMs). +Each CM consists of a ARM processor core and associated hardware e.g + FPGA implementing various controllers and/or register + SSRAM + SDRAM + RAM controllers + clock generators etc. +CMs may be fitted with varying amounts of SDRAM using a DIMM socket. + +Boot Methods : +------------ +Integrator platforms can be configured to use U-Boot in at least three ways :- +a) Run ARM boot monitor, manually run U-Boot image from flash +b) Run ARM boot monitor, automatically run U-Boot image from flash +c) Run U-Boot image direct from flash. + +In cases a) and b) the ARM boot monitor will have configured the CM and mapped +writeable memory to 0x00000000 in the Integrator address space. +U-Boot has to carry out minimal configration before standard code is run. + +In case c) it may be necessary for U-Boot to perform CM dependent initialization. + +Configuring U-Boot : +------------------ + The makefile contains targets for Integrator platforms of both types +fitted with all current variants of CM. If these targets are to be used with +boot process c) above then CONFIG_INIT_CRITICAL may need to be defined to ensure +that the CM is correctly configured. + + There are also targets independent of CM. These may not be suitable for +boot process c) above. They have been preserved for backward compatibility with +existing build processes. + +Code Hierarchy Applied : +---------------------- +Code specific to initialization of a particular ARM processor has been placed in +cpu/arm<>/start.S so that it may be used by other boards. + +However, to avoid duplicating code through all processor files, a generic core +for ARM Integrator CMs has been added + + cpu/arm_intcm + +Otherwise. for example, the standard CM reset via the CM control register would +need placing in each CM processor file...... + +Code specific to the initialization of the CM, rather than the cpu, and initialization +of the Integrator board itself, has been placed in + + board/integrator<>/platform.S + board/integrator<>/integrator<>.c + +Targets +======= +The U-Boot make targets map to the available core modules as below. + +Integrator/AP is no longer available from ARM. +Core modules marked ** are also no longer available. + +ap720t_config ** CM720T +ap920t_config ** CM920T +ap926ejs_config Integrator Core Module for ARM926EJ-STM +ap946es_config Integrator Core Module for ARM946E-STM +cp920t_config ** CM920T +cp926ejs_config Integrator Core Module for ARM926EJ-STM +cp946es_config Integrator Core Module for ARM946E-STM +cp1136_config Integrator Core Module ARM1136JF-S TM + +The final groups of targets are for core modules where no explicit cpu +code has yet been added to U-Boot i.e. they all use the same U-Boot binary +using the generic "arm_intcm" core: + +ap966_config Integrator Core Module for ARM966E-S TM +ap922_config Integrator Core Module for ARM922T TM with ETM +ap922_XA10_config Integrator Core Module for ARM922T using Altera Excalibur +ap7_config ** CM7TDMI +integratorap_config +ap_config + + +cp966_config Integrator Core Module for ARM966E-S TM +cp922_config Integrator Core Module for ARM922T TM with ETM +cp922_XA10_config Integrator Core Module for ARM922T using Altera Excalibur +cp1026_config Integrator Core Module ARM1026EJ-S TM +integratorcp_config +cp_config + +The Makefile targets call board/integrator<>/split_by_variant.sh +to configure various defines in include/configs/integrator<>.h +to indicate the core module & core configuration and ensure that +board/integrator<>/u-boot.lds loads the cpu object first in the U-Boot image. + +********************************* +Because of this mechanism +> make clean +must be run before each change in configuration +********************************* |