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/arm/cpu/at91-common/spl.c

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/*
* Copyright (C) 2013 Atmel Corporation
* Bo Shen <voice.shen@atmel.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/at91_common.h>
#include <asm/arch/at91_wdt.h>
#include <asm/arch/clk.h>
#include <spl.h>
void at91_disable_wdt(void)
{
struct at91_wdt *wdt = (struct at91_wdt *)ATMEL_BASE_WDT;
writel(AT91_WDT_MR_WDDIS, &wdt->mr);
}
u32 spl_boot_device(void)
{
#ifdef CONFIG_SYS_USE_MMC
return BOOT_DEVICE_MMC1;
#elif CONFIG_SYS_USE_NANDFLASH
return BOOT_DEVICE_NAND;
#elif CONFIG_SYS_USE_SERIALFLASH
return BOOT_DEVICE_SPI;
#endif
return BOOT_DEVICE_NONE;
}
u32 spl_boot_mode(void)
{
switch (spl_boot_device()) {
#ifdef CONFIG_SYS_USE_MMC
case BOOT_DEVICE_MMC1:
return MMCSD_MODE_FS;
break;
#endif
case BOOT_DEVICE_NONE:
default:
hang();
}
}