Some scripts to manage OpenWrt EFI images on x86_64.
gen-efi-image.sh
$ ./gen-efi-image.sh SOURCE_IMG EFI_IMG DEST_IMG
Generates an EFI-compatible x86-64 disk image for OpenWrt by combining the rootfs and kernel from the latest stable release with the EFI image available in snapshot since @a6b7c3e.
Requires qemu-utils package.
Tested with versions 19.07 through 21.02.0-rc4 (r16256-2d5ee43dc6).
Download the latest stable release from OpenWrt:
$ OPENWRT_VER=19.07.5
$ wget https://downloads.openwrt.org/releases/${OPENWRT_VER}/targets/x86/64/openwrt-${OPENWRT_VER}-x86-64-combined-ext4.img.gz
Download the EFI snapshot image:
$ wget https://downloads.openwrt.org/snapshots/targets/x86/64/openwrt-x86-64-generic-ext4-combined-efi.img.gz
Generate the latest stable image:
$ ./gen-efi-image.sh \
openwrt-${OPENWRT_VER}-x86-64-combined-ext4.img.gz \
openwrt-x86-64-generic-ext4-combined-efi.img.gz \
openwrt-${OPENWRT_VER}-x86-64-combined-ext4-efi.img
-
resize-image.sh[size]and[disk path]is optional, defaults to 2G Resize to a specified size:
# ./resize-image.sh -i openwrt-${OPENWRT_VER}-x86-64-combined-ext4-efi.img -s 16G
or to resize to a disk size:
# ./resize-image.sh -i openwrt-${OPENWRT_VER}-x86-64-combined-ext4-efi.img -d /dev/sda
Change the output file path with -o.
Generate a resized image with a larger root partition. Online resize from within OpenWrt is not possible with such a small disk and results in errors.
qemu.sh
$ ./qemu.sh IMAGE
Runs the image in QEMU in EFI mode.
On Debian / Ubuntu, the packages qemu-kvm and ovmf must be installed. The path to the OVMF
firmware on Debian / Ubuntu should be changed to /usr/share/OVMF/OVMF_CODE.fd.