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/mach-uniphier/sbc/sbc-ld4.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2011-2015 Panasonic Corporation
* Copyright (C) 2015-2017 Socionext Inc.
*/
#include <linux/io.h>
#include "../init.h"
#include "sbc-regs.h"
void uniphier_ld4_sbc_init(void)
{
u32 tmp;
uniphier_sbc_init_savepin();
/* system bus output enable */
tmp = readl(PC0CTRL);
tmp &= 0xfffffcff;
writel(tmp, PC0CTRL);
}