fdt: Provide debug info when a device tree cannot be found

It can be quite confusing with a new platform to figure out why the device
tree cannot be located. Add some debug information for this case.

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index f6c2b19..232ca74 100644 (file)
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -568,6 +568,13 @@ int fdtdec_prepare_fdt(void)
                puts("Missing DTB\n");
 #else
                puts("No valid device tree binary found - please append one to U-Boot binary, use u-boot-dtb.bin or define CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n");
+# ifdef DEBUG
+               if (gd->fdt_blob) {
+                       printf("fdt_blob=%p\n", gd->fdt_blob);
+                       print_buffer((ulong)gd->fdt_blob, gd->fdt_blob, 4,
+                                    32, 0);
+               }
+# endif
 #endif
                return -1;
        }