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/common/spl/spl_bootrom.c

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/*
* Copyright (C) 2017 Theobroma Systems Design und Consulting GmH
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <spl.h>
__weak void board_return_to_bootrom(void)
{
}
static int spl_return_to_bootrom(struct spl_image_info *spl_image,
struct spl_boot_device *bootdev)
{
/*
* If the board implements a way to return to its ROM (with
* the expectation that the next stage of will be booted by
* the ROM), it will implement board_return_to_bootrom() and
* should not return from it.
*/
board_return_to_bootrom();
return false;
}
SPL_LOAD_IMAGE_METHOD("BOOTROM", 0, BOOT_DEVICE_BOOTROM, spl_return_to_bootrom);