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https://github.com/u-boot/u-boot.git
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0e72ac7150
At present we call spl_init() before identifying the CPU. This is not a good idea - e.g. if bootstage is enabled then it will try to set up the timer which works better if the CPU is identified. Put explicit code at each entry pointer to identify the CPU. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
74 lines
1.8 KiB
ArmAsm
74 lines
1.8 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* 32-bit x86 Startup Code when running from SPL. This is the startup code in
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* U-Boot proper, when SPL is used.
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* Copyright 2018 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#include <config.h>
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.section .text.start
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.code32
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.globl _start
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.type _start, @function
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_start:
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/* Set up memory using the existing stack */
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movl $(CONFIG_SYS_CAR_ADDR + CONFIG_SYS_CAR_SIZE - 4), %eax
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#ifdef CONFIG_DCACHE_RAM_MRC_VAR_SIZE
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subl $CONFIG_DCACHE_RAM_MRC_VAR_SIZE, %eax
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#endif
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/*
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* We don't subject CONFIG_DCACHE_RAM_MRC_VAR_SIZE since memory is
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* already set up. This has the happy side-effect of putting gd in a
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* new place separate from SPL, so the memset() in
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* board_init_f_init_reserve() does not cause any problems (otherwise
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* it would zero out the gd and crash)
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*/
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call board_init_f_alloc_reserve
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mov %eax, %esp
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call board_init_f_init_reserve
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call x86_cpu_reinit_f
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xorl %eax, %eax
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call board_init_f
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call board_init_f_r
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/* Should not return here */
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jmp .
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.globl board_init_f_r_trampoline
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.type board_init_f_r_trampoline, @function
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board_init_f_r_trampoline:
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/*
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* SPL has been executed and SDRAM has been initialised, U-Boot code
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* has been copied into RAM, BSS has been cleared and relocation
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* adjustments have been made. It is now time to jump into the in-RAM
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* copy of U-Boot
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*
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* %eax = Address of top of new stack
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*/
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/* Stack grows down from top of SDRAM */
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movl %eax, %esp
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/* Re-enter U-Boot by calling board_init_f_r() */
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call board_init_f_r
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die:
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hlt
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jmp die
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hlt
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.align 4
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_dt_ucode_base_size:
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/* These next two fields are filled in by binman */
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.globl ucode_base
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ucode_base: /* Declared in microcode.h */
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.long 0 /* microcode base */
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.globl ucode_size
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ucode_size: /* Declared in microcode.h */
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.long 0 /* microcode size */
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