u-boot/board/raspberrypi/rpi/lowlevel_init.S

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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* (C) Copyright 2016
* Cédric Schieli <cschieli@gmail.com>
*/
#include <config.h>
/*
* Routine: save_boot_params (called after reset from start.S)
* Description: save ATAG/FDT address provided by the firmware at boot time
*/
.global save_boot_params
save_boot_params:
/* The firmware provided ATAG/FDT address can be found in r2/x0 */
#ifdef CONFIG_ARM64
adr x8, fw_dtb_pointer
str x0, [x8]
#else
ldr r8, =fw_dtb_pointer
str r2, [r8]
#endif
/* Returns */
b save_boot_params_ret