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 <config.h>
9 #include <errno.h>
10 #include <log.h>
11 #include <linux/libfdt.h>
12 #include <asm/arch/sys_proto.h>
13 #include <asm/sections.h>
14 #include <asm/system.h>
15 
16 /*
17  * Use the saved FDT address provided by TF-A at boot time (NT_FW_CONFIG =
18  * Non Trusted Firmware configuration file) when the pointer is valid
19  */
board_fdt_blob_setup(void ** fdtp)20 int board_fdt_blob_setup(void **fdtp)
21 {
22 	unsigned long nt_fw_dtb = get_stm32mp_bl2_dtb();
23 
24 	log_debug("%s: nt_fw_dtb=%lx\n", __func__, nt_fw_dtb);
25 
26 	/* use external device tree only if address is valid */
27 	if (nt_fw_dtb < STM32_DDR_BASE ||
28 	    fdt_magic(nt_fw_dtb) != FDT_MAGIC) {
29 		log_debug("DTB not found.\n");
30 		log_debug("fall back to builtin DTB, %p\n", _end);
31 
32 		return -EEXIST;
33 	}
34 
35 	*fdtp = (void *)nt_fw_dtb;
36 
37 	return 0;
38 }
39