1 /*
2 * Copyright (c) 2021, ARM Limited. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <libfdt.h>
8
9 #include <common/debug.h>
10 #include <common/fdt_fixup.h>
11 #include <common/fdt_wrappers.h>
12
13 #include <sunxi_private.h>
14
sunxi_prepare_dtb(void * fdt)15 void sunxi_prepare_dtb(void *fdt)
16 {
17 int ret;
18
19 if (fdt == NULL || fdt_check_header(fdt) != 0) {
20 return;
21 }
22 ret = fdt_open_into(fdt, fdt, 0x100000);
23 if (ret < 0) {
24 ERROR("Preparing devicetree at %p: error %d\n", fdt, ret);
25 return;
26 }
27
28 /* Reserve memory used by Trusted Firmware. */
29 if (fdt_add_reserved_memory(fdt, "tf-a@40000000", BL31_BASE,
30 BL31_LIMIT - BL31_BASE)) {
31 WARN("Failed to add reserved memory nodes to DT.\n");
32 return;
33 }
34
35 ret = fdt_pack(fdt);
36 if (ret < 0) {
37 ERROR("Failed to pack devicetree at %p: error %d\n",
38 fdt, ret);
39 } else {
40 clean_dcache_range((uintptr_t)fdt, fdt_blob_size(fdt));
41 INFO("Changed devicetree to reserve BL31 memory.\n");
42 }
43 }
44