1 // SPDX-License-Identifier: LGPL-2.1-or-later
2 /*
3 * libfdt - Flat Device Tree manipulation
4 * Testcase for DT overlays()
5 * Copyright (C) 2016 Free Electrons
6 * Copyright (C) 2016 NextThing Co.
7 */
8
9 #include <stdio.h>
10
11 #include <libfdt.h>
12
13 #include "tests.h"
14
15 #define CHECK(code, expected) \
16 { \
17 err = (code); \
18 if (err != expected) \
19 FAIL(#code ": %s", fdt_strerror(err)); \
20 }
21
22 /* 4k ought to be enough for anybody */
23 #define FDT_COPY_SIZE (4 * 1024)
24
open_dt(char * path)25 static void *open_dt(char *path)
26 {
27 void *dt, *copy;
28 int err;
29
30 dt = load_blob(path);
31 copy = xmalloc(FDT_COPY_SIZE);
32
33 /*
34 * Resize our DTs to 4k so that we have room to operate on
35 */
36 CHECK(fdt_open_into(dt, copy, FDT_COPY_SIZE), 0);
37
38 return copy;
39 }
40
main(int argc,char * argv[])41 int main(int argc, char *argv[])
42 {
43 void *fdt_base, *fdt_overlay;
44 int err;
45
46 test_init(argc, argv);
47 if (argc != 3)
48 CONFIG("Usage: %s <base dtb> <overlay dtb>", argv[0]);
49
50 fdt_base = open_dt(argv[1]);
51 fdt_overlay = open_dt(argv[2]);
52
53 /* Apply the overlay */
54 CHECK(fdt_overlay_apply(fdt_base, fdt_overlay), -FDT_ERR_BADOVERLAY);
55
56 PASS();
57 }
58