upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/arch/x86/cpu/start64.S

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/*
* 64-bit x86 Startup Code
*
* (C) Copyright 216 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <config.h>
.section .text
.code64
.globl _start
.type _start, @function
_start:
/* Set up memory using the existing stack */
mov %rsp, %rdi
call board_init_f_alloc_reserve
mov %rax, %rsp
call board_init_f_init_reserve
call board_init_f
call board_init_f_r
/* Should not return here */
jmp .