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diff --git a/roms/u-boot/board/freescale/ls1021atwr/psci.S b/roms/u-boot/board/freescale/ls1021atwr/psci.S
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+++ b/roms/u-boot/board/freescale/ls1021atwr/psci.S
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+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2016 NXP Semiconductor.
+ * Author: Wang Dongsheng <dongsheng.wang@freescale.com>
+ */
+
+#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:
+1: wfi
+ b 1b
+
+ .popsection