mirror of
https://github.com/brain-hackers/u-boot-brain
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49d5ff439c
At present in arch_setup_gd() it calls printch(' ') at the end which
has been a mystery for a long time as without such call the 64-bit
U-Boot just does not boot at all.
In fact this is due to the bug that board_init_f() was called with
boot_flags not being set. Hence whatever value being there in the
rdi register becomes the boot_flags if without such magic call.
With a printch(' ') call the rdi register is initialized as 0x20
and this value seems to be sane enough for the whole boot process.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
29 lines
491 B
ArmAsm
29 lines
491 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* 64-bit x86 Startup Code
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*
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* (C) Copyright 216 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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.code64
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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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mov %rsp, %rdi
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call board_init_f_alloc_reserve
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mov %rax, %rsp
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call board_init_f_init_reserve
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xor %rdi, %rdi
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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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