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/board/freescale/ls1021aqds/psci.S

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/*
* Copyright 2016 NXP Semiconductor.
* Author: Wang Dongsheng <dongsheng.wang@freescale.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <config.h>
#include <linux/linkage.h>
#include <asm/armv7.h>
#include <asm/psci.h>
.pushsection ._secure.text, "ax"
.arch_extension sec
.align 5
.globl psci_system_off
psci_system_off:
@ Get QIXIS base address
movw r1, #(QIXIS_BASE & 0xffff)
movt r1, #(QIXIS_BASE >> 16)
ldrb r2, [r1, #QIXIS_PWR_CTL]
orr r2, r2, #QIXIS_PWR_CTL_POWEROFF
strb r2, [r1, #QIXIS_PWR_CTL]
1: wfi
b 1b
.popsection