u-boot/arch/arm/cpu/armv7/lowlevel_init.S
Tom Rini ffb5656862 armv7: Mark the default lowlevel_init function as weak
Rather than have a long and if check in the Makefile, mark the default
lowlevel_init function as weak (as we do on armv8) so that SoCs can
override it if needed, and it will still be discarded if unused.
Provide a weak s_init as well to allow for this to link and be
discarded.

Signed-off-by: Tom Rini <trini@konsulko.com>
2017-06-05 11:02:23 -04:00

71 lines
1.5 KiB
ArmAsm

/*
* A lowlevel_init function that sets up the stack to call a C function to
* perform further init.
*
* (C) Copyright 2010
* Texas Instruments, <www.ti.com>
*
* Author :
* Aneesh V <aneesh@ti.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <asm-offsets.h>
#include <config.h>
#include <linux/linkage.h>
.pushsection .text.s_init, "ax"
WEAK(s_init)
bx lr
ENDPROC(s_init)
.popsection
.pushsection .text.lowlevel_init, "ax"
WEAK(lowlevel_init)
/*
* Setup a temporary stack. Global data is not available yet.
*/
#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_STACK)
ldr sp, =CONFIG_SPL_STACK
#else
ldr sp, =CONFIG_SYS_INIT_SP_ADDR
#endif
bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
#ifdef CONFIG_SPL_DM
mov r9, #0
#else
/*
* Set up global data for boards that still need it. This will be
* removed soon.
*/
#ifdef CONFIG_SPL_BUILD
ldr r9, =gdata
#else
sub sp, sp, #GD_SIZE
bic sp, sp, #7
mov r9, sp
#endif
#endif
/*
* Save the old lr(passed in ip) and the current lr to stack
*/
push {ip, lr}
/*
* Call the very early init function. This should do only the
* absolute bare minimum to get started. It should not:
*
* - set up DRAM
* - use global_data
* - clear BSS
* - try to start a console
*
* For boards with SPL this should be empty since SPL can do all of
* this init in the SPL board_init_f() function which is called
* immediately after this.
*/
bl s_init
pop {ip, pc}
ENDPROC(lowlevel_init)
.popsection