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diff --git a/doc/README-integrator b/doc/README-integrator new file mode 100644 index 0000000..93d7688 --- /dev/null +++ b/doc/README-integrator @@ -0,0 +1,66 @@ + + 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. + +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 + + + |