diff --git a/target/linux/x86/image/grub-iso.cfg b/target/linux/x86/image/grub-iso.cfg
index 9c59bdf6d4..4bef492a41 100644
--- a/target/linux/x86/image/grub-iso.cfg
+++ b/target/linux/x86/image/grub-iso.cfg
@@ -3,8 +3,13 @@
 
 set default="0"
 set timeout="@TIMEOUT@"
-set root='(cd)'
+
+if [ "${grub_platform}" = "efi" ]; then
+    set root='(cd0)'
+else
+    set root='(cd)'
+fi
 
 menuentry "@TITLE@" {
-	linux /boot/vmlinuz @CMDLINE@ noinitrd
+	linux /boot/vmlinuz root=/dev/sr0 rootfstype=iso9660 rootwait @CMDLINE@ noinitrd
 }
diff --git a/target/linux/x86/image/grub.cfg b/target/linux/x86/image/grub.cfg
index dedfa0a636..75605bcabf 100644
--- a/target/linux/x86/image/grub.cfg
+++ b/target/linux/x86/image/grub.cfg
@@ -3,11 +3,11 @@
 
 set default="0"
 set timeout="@TIMEOUT@"
-set root='(@ROOT@)'
+set root='(hd0,msdos1)'
 
 menuentry "@TITLE@" {
-	linux /boot/vmlinuz @CMDLINE@ noinitrd
+	linux /boot/vmlinuz @ROOTPART@ @CMDLINE@ noinitrd
 }
 menuentry "@TITLE@ (failsafe)" {
-	linux /boot/vmlinuz failsafe=true @CMDLINE@ noinitrd
+	linux /boot/vmlinuz failsafe=true @ROOTPART@ @CMDLINE@ noinitrd
 }