+int mmap_fdt(struct mkimage_params *params, const char *fname, void **blobp,
+ struct stat *sbuf)
+{
+ void *ptr;
+ int fd;
+
+ /* Load FIT blob into memory (we need to write hashes/signatures) */
+ fd = open(fname, O_RDWR | O_BINARY);
+
+ if (fd < 0) {
+ fprintf(stderr, "%s: Can't open %s: %s\n",
+ params->cmdname, fname, strerror(errno));
+ unlink(fname);
+ return -1;
+ }
+
+ if (fstat(fd, sbuf) < 0) {
+ fprintf(stderr, "%s: Can't stat %s: %s\n",
+ params->cmdname, fname, strerror(errno));
+ unlink(fname);
+ return -1;
+ }
+
+ ptr = mmap(0, sbuf->st_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
+ if (ptr == MAP_FAILED) {
+ fprintf(stderr, "%s: Can't read %s: %s\n",
+ params->cmdname, fname, strerror(errno));
+ unlink(fname);
+ return -1;
+ }
+
+ /* check if ptr has a valid blob */
+ if (fdt_check_header(ptr)) {
+ fprintf(stderr, "%s: Invalid FIT blob\n", params->cmdname);
+ unlink(fname);
+ return -1;
+ }
+
+ *blobp = ptr;
+ return fd;
+}
+