1 // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
2 /*
3  * Copyright (C) 2019, STMicroelectronics - All Rights Reserved
4  */
5 
6 #define LOG_CATEGORY LOGC_ARCH
7 
8 #include <common.h>
9 #include <log.h>
10 #include <linux/libfdt.h>
11 #include <asm/arch/sys_proto.h>
12 #include <asm/sections.h>
13 #include <asm/system.h>
14 
15 /*
16  * Use the saved FDT address provided by TF-A at boot time (NT_FW_CONFIG =
17  * Non Trusted Firmware configuration file) when the pointer is valid
18  */
board_fdt_blob_setup(int * err)19 void *board_fdt_blob_setup(int *err)
20 {
21 	unsigned long nt_fw_dtb = get_stm32mp_bl2_dtb();
22 
23 	log_debug("%s: nt_fw_dtb=%lx\n", __func__, nt_fw_dtb);
24 
25 	*err = 0;
26 	/* use external device tree only if address is valid */
27 	if (nt_fw_dtb >= STM32_DDR_BASE) {
28 		if (fdt_magic(nt_fw_dtb) == FDT_MAGIC)
29 			return (void *)nt_fw_dtb;
30 		log_debug("%s: DTB not found.\n", __func__);
31 	}
32 	log_debug("%s: fall back to builtin DTB, %p\n", __func__, &_end);
33 
34 	return (void *)&_end;
35 }
36