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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
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