diff --git a/tools-image/prepare_arm_images.sh b/tools-image/prepare_arm_images.sh
index 6528b86..d96eea6 100755
--- a/tools-image/prepare_arm_images.sh
+++ b/tools-image/prepare_arm_images.sh
@@ -33,6 +33,14 @@ ensure_dir_structure() {
     done
 }
 
+mkdir -p $WORKDIR/tmpefi
+
+# Create the EFI partition FAT16 and include the EFI image and a basic grub.cfg
+truncate -s $((20*1024*1024)) bootloader/efi.img
+cp -rfv /arm/grub/efi/* $WORKDIR/tmpefi
+mkfs.fat -F16 -n COS_GRUB bootloader/efi.img
+mcopy -s -i bootloader/efi.img $WORKDIR/tmpefi/EFI ::EFI
+
 mkdir -p ${STATEDIR}/cOS
 
 dd if=/dev/zero of=${STATEDIR}/cOS/active.img bs=1M count=$default_active_size