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/include/configs/x86-chromebook.h

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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (c) 2015 Google, Inc
*/
#ifndef _X86_CHROMEBOOK_H
#define _X86_CHROMEBOOK_H
#define CONFIG_SYS_MONITOR_LEN (1 << 20)
#define CONFIG_MISC_INIT_R
#define CONFIG_X86_MRC_ADDR 0xfffa0000
#define CONFIG_X86_REFCODE_ADDR 0xffea0000
#define CONFIG_X86_REFCODE_RUN_ADDR 0
#define CONFIG_PCI_MEM_BUS 0xe0000000
#define CONFIG_PCI_MEM_PHYS CONFIG_PCI_MEM_BUS
#define CONFIG_PCI_MEM_SIZE 0x10000000
#define CONFIG_PCI_PREF_BUS 0xd0000000
#define CONFIG_PCI_PREF_PHYS CONFIG_PCI_PREF_BUS
#define CONFIG_PCI_PREF_SIZE 0x10000000
#define CONFIG_PCI_IO_BUS 0x1000
#define CONFIG_PCI_IO_PHYS CONFIG_PCI_IO_BUS
#define CONFIG_PCI_IO_SIZE 0xefff
#define CONFIG_BIOSEMU
#define VIDEO_IO_OFFSET 0
#define CONFIG_X86EMU_RAW_IO
#undef CONFIG_ENV_SIZE
#define CONFIG_ENV_SIZE 0x1000
#define CONFIG_ENV_SECT_SIZE 0x1000
#define CONFIG_ENV_OFFSET 0x003f8000
#define CONFIG_STD_DEVICES_SETTINGS "stdin=usbkbd,i8042-kbd,serial\0" \
"stdout=vidconsole,serial\0" \
"stderr=vidconsole,serial\0"
#endif