fdt: Skip checking FDT if the pointer is NULL

If we have no FDT, don't attempt to read from it. This allows sandbox to
run without an FDT if required.

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

diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 60369fb..ac1fe0b 100644 (file)
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -354,7 +354,8 @@ int fdtdec_check_fdt(void)
  */
 int fdtdec_prepare_fdt(void)
 {
-       if (((uintptr_t)gd->fdt_blob & 3) || fdt_check_header(gd->fdt_blob)) {
+       if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) ||
+           fdt_check_header(gd->fdt_blob)) {
                printf("No valid FDT 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");