fix

Signed-off-by: surenyi <surenyi82@163.com>

arch/arm/mach-rockchip/boot_rkimg.c

@@ -491,21 +491,23 @@ static int rockchip_read_distro_dtb(void *fdt_addr)
 	if (!rockchip_get_bootdev() || !fdt_addr)
 		return -ENODEV;
 
+    part_id = get_boot_part_num();
+	if (part_id > 0)
+		goto next;
+
 	if (run_command_list(cmd, -1, 0)) {
 		printf("Failed to find -bootable\n");
 		return -EINVAL;
 	}
 
-    part_id = get_boot_part_num();
-    if (part_id <= 0) {
 	devplist = env_get("devplist");
 	if (!devplist) {
 		part_id = 1;
 	} else {
 		part_id = strtoul(devplist, NULL, 16);
 	}
-    }
 
+next:
 	devtype = env_get("devtype");
 	devnum = env_get("devnum");
     sprintf(devnum_part, "%s:%d", devnum, part_id);