-@@ -1172,7 +1186,7 @@ main (int argc, char *argv[])
- setup (arguments.dir ? : DEFAULT_DIRECTORY,
- arguments.boot_file ? : DEFAULT_BOOT_FILE,
- arguments.core_file ? : DEFAULT_CORE_FILE,
-- dest_dev, arguments.force,
-+ arguments.root_dev, dest_dev, arguments.force,
- arguments.fs_probe, arguments.allow_floppy);
+@@ -313,7 +323,7 @@ main (int argc, char *argv[])
+ GRUB_SETUP_FUNC (arguments.dir ? : DEFAULT_DIRECTORY,
+ arguments.boot_file ? : DEFAULT_BOOT_FILE,
+ arguments.core_file ? : DEFAULT_CORE_FILE,
+- dest_dev, arguments.force,
++ arguments.root_dev, dest_dev, arguments.force,
+ arguments.fs_probe, arguments.allow_floppy,
+ arguments.add_rs_codes);
+
+--- a/util/setup.c
++++ b/util/setup.c
+@@ -247,13 +247,12 @@ identify_partmap (grub_disk_t disk __att
+ void
+ SETUP (const char *dir,
+ const char *boot_file, const char *core_file,
+- const char *dest, int force,
++ const char *root, const char *dest, int force,
+ int fs_probe, int allow_floppy,
+ int add_rs_codes __attribute__ ((unused))) /* unused on sparc64 */
+ {
+ char *core_path;
+ char *boot_img, *core_img, *boot_path;
+- char *root = 0;
+ size_t boot_size, core_size;
+ #ifdef GRUB_SETUP_BIOS
+ grub_uint16_t core_sectors;
+@@ -307,7 +306,10 @@ SETUP (const char *dir,
+
+ core_dev = dest_dev;
+
+- {
++ if (root)
++ root_dev = grub_device_open(root);
++
++ if (!root_dev) {
+ char **root_devices = grub_guess_root_devices (dir);
+ char **cur;
+ int found = 0;
+@@ -317,6 +319,8 @@ SETUP (const char *dir,
+ char *drive;
+ grub_device_t try_dev;
+
++ if (root_dev)
++ break;
+ drive = grub_util_get_grub_dev (*cur);
+ if (!drive)
+ continue;
+--- a/include/grub/util/install.h
++++ b/include/grub/util/install.h
+@@ -182,13 +182,13 @@ grub_install_get_image_target (const cha
+ void
+ grub_util_bios_setup (const char *dir,
+ const char *boot_file, const char *core_file,
+- const char *dest, int force,
++ const char *root, const char *dest, int force,
+ int fs_probe, int allow_floppy,
+ int add_rs_codes);
+ void
+ grub_util_sparc_setup (const char *dir,
+ const char *boot_file, const char *core_file,
+- const char *dest, int force,
++ const char *root, const char *dest, int force,
+ int fs_probe, int allow_floppy,
+ int add_rs_codes);