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https://github.com/brain-hackers/u-boot-brain
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22a402f00c
The SPL and U-Boot proper may use different initial stack locations, which are configured via CONFIG_SPL_STACK and CONFIG_SYS_INIT_SP_ADDR defines. The lowlevel_init.S code needs to handle this in the same way as crt0.S Without this fix, setting the U-Boot stack location to some place, which is not safely accessible by the SPL (such as the DRAM), causes a very early SPL deadlock. Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com> Reviewed-by: Tom Rini <trini@konsulko.com> Reviewed-by: Simon Glass <sjg@chromium.org>
64 lines
1.3 KiB
ArmAsm
64 lines
1.3 KiB
ArmAsm
/*
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* A lowlevel_init function that sets up the stack to call a C function to
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* perform further init.
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*
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* (C) Copyright 2010
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* Texas Instruments, <www.ti.com>
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*
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* Author :
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* Aneesh V <aneesh@ti.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <asm-offsets.h>
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#include <config.h>
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#include <linux/linkage.h>
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ENTRY(lowlevel_init)
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/*
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* Setup a temporary stack. Global data is not available yet.
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*/
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#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_STACK)
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ldr sp, =CONFIG_SPL_STACK
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#else
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ldr sp, =CONFIG_SYS_INIT_SP_ADDR
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#endif
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bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
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#ifdef CONFIG_SPL_DM
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mov r9, #0
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#else
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/*
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* Set up global data for boards that still need it. This will be
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* removed soon.
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*/
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#ifdef CONFIG_SPL_BUILD
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ldr r9, =gdata
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#else
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sub sp, sp, #GD_SIZE
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bic sp, sp, #7
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mov r9, sp
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#endif
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#endif
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/*
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* Save the old lr(passed in ip) and the current lr to stack
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*/
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push {ip, lr}
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/*
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* Call the very early init function. This should do only the
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* absolute bare minimum to get started. It should not:
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*
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* - set up DRAM
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* - use global_data
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* - clear BSS
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* - try to start a console
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*
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* For boards with SPL this should be empty since SPL can do all of
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* this init in the SPL board_init_f() function which is called
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* immediately after this.
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*/
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bl s_init
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pop {ip, pc}
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ENDPROC(lowlevel_init)
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