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arm: Set up global data before board_init_f() 

At present arm defines CONFIG_SYS_GENERIC_GLOBAL_DATA, meaning that
the global_data pointer is set up in board_init_f(). However it is
actually set up before this, it just isn't zeroed.

If we zero the global data before calling board_init_f() then we
don't need to define CONFIG_SYS_GENERIC_GLOBAL_DATA.

Make this change (on arm32 only) to simplify the init process. I
don't have the ability to test aarch64 yet.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Tom Rini <trini@ti.com>
This commit is contained in:
Simon Glass 2014-07-10 22:23:26 -06:00
parent 25b4adbba0
commit aae2aef9c8
2 changed files with 11 additions and 0 deletions
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2
arch/arm/include/asm/config.h
View File

@ -7,7 +7,9 @@
#ifndef _ASM_CONFIG_H_
#define _ASM_CONFIG_H_
#ifdef __aarch64__
#define CONFIG_SYS_GENERIC_GLOBAL_DATA
#endif
#define CONFIG_LMB
#define CONFIG_SYS_BOOT_RAMDISK_HIGH

9
arch/arm/lib/crt0.S
View File

@ -67,10 +67,19 @@ ENTRY(_main)
ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
#endif
bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
mov r2, sp
sub sp, sp, #GD_SIZE /* allocate one GD above SP */
bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
mov r9, sp /* GD is above SP */
mov r1, sp
mov r0, #0
clr_gd:
cmp r1, r2 /* while not at end of GD */
strlo r0, [r1] /* clear 32-bit GD word */
addlo r1, r1, #4 /* move to next */
blo clr_gd
/* mov r0, #0 not needed due to above code */
bl board_init_f
#if ! defined(CONFIG_SPL_BUILD)