u-boot/arch/arm/mach-tegra/lowlevel_init.S

/*
 * SoC-specific setup info
 *
 * (C) Copyright 2010,2011
 * NVIDIA Corporation <www.nvidia.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <config.h>
#include <linux/linkage.h>

#ifdef CONFIG_ARM64
	.align	5
ENTRY(reset_cpu)
	/* get address for global reset register */
	ldr	x1, =PRM_RSTCTRL
	ldr	w3, [x1]
	/* force reset */
	orr	w3, w3, #0x10
	str	w3, [x1]
	mov	w0, w0
1:
	b	1b
ENDPROC(reset_cpu)
#else
	.align	5
ENTRY(reset_cpu)
	ldr	r1, rstctl			@ get addr for global reset
						@ reg
	ldr	r3, [r1]
	orr	r3, r3, #0x10
	str	r3, [r1]			@ force reset
	mov	r0, r0
_loop_forever:
	b	_loop_forever
rstctl:
	.word	PRM_RSTCTRL
ENDPROC(reset_cpu)
#endif