u-boot/arch/arm/include/asm/arch-sunxi/boot0.h

/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Configuration settings for the Allwinner A64 (sun50i) CPU
 */

#if defined(CONFIG_RESERVE_ALLWINNER_BOOT0_HEADER) && !defined(CONFIG_SPL_BUILD)
/* reserve space for BOOT0 header information */
	b	reset
	.space	1532
#elif defined(CONFIG_ARM_BOOT_HOOK_RMR)
/*
 * Switch into AArch64 if needed.
 * Refer to arch/arm/mach-sunxi/rmr_switch.S for the original source.
 */
	tst     x0, x0                  // this is "b #0x84" in ARM
	b       reset
	.space  0x7c
	.word	0xe59f1024	// ldr     r1, [pc, #36] ; 0x170000a0
	.word	0xe59f0024	// ldr     r0, [pc, #36] ; CONFIG_*_TEXT_BASE
	.word	0xe5810000	// str     r0, [r1]
	.word	0xf57ff04f	// dsb     sy
	.word	0xf57ff06f	// isb     sy
	.word	0xee1c0f50	// mrc     15, 0, r0, cr12, cr0, {2} ; RMR
	.word	0xe3800003	// orr     r0, r0, #3
	.word	0xee0c0f50	// mcr     15, 0, r0, cr12, cr0, {2} ; RMR
	.word	0xf57ff06f	// isb     sy
	.word	0xe320f003	// wfi
	.word	0xeafffffd	// b       @wfi
#ifndef CONFIG_MACH_SUN50I_H6
	.word	0x017000a0	// writeable RVBAR mapping address
#else
	.word	0x09010040	// writeable RVBAR mapping address
#endif
#ifdef CONFIG_SPL_BUILD
	.word	CONFIG_SPL_TEXT_BASE
#else
	.word   CONFIG_SYS_TEXT_BASE
#endif
#else
/* normal execution */
	b	reset
#endif