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-imx/sip.c

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/*
* Copyright 2017 NXP
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/arch/sys_proto.h>
unsigned long call_imx_sip(unsigned long id, unsigned long reg0,
unsigned long reg1, unsigned long reg2)
{
struct pt_regs regs;
regs.regs[0] = id;
regs.regs[1] = reg0;
regs.regs[2] = reg1;
regs.regs[3] = reg2;
smc_call(&regs);
return regs.regs[0];
}