[meta-intel] [Patch v4 4/6] image-ucode.bbclass: a new bbclass for initramfs images

[Burton, Ross]

On 19 July 2014 01:18,  <nitin.a.kamble at intel.com> wrote:
> +IMAGE_TYPES += "cpio.gz.ucode"
> +COMPRESSIONTYPES += "gz.ucode"
> +COMPRESS_CMD_gz.ucode = "${COMPRESS_CMD_gz}; cat ${EARLY_UCODE_CPIO} ${IMAGE_NAME}.rootfs.${type}.gz > ${IMAGE_NAME}.rootfs.${type}.gz.ucode"
> +COMPRESS_DEPENDS_gz.ucode = "${COMPRESS_DEPENDS_gz} intel-microcode"

Something about this has always bugged me and I just realised what it
is.  As I understand it the kernel allows an arbitrary number of cpio
archives to be appended to the kernel, but our image creation code
expects one.  This class is basically working around that limitation
by being a specialised image type that appends another hard-coded
file.

If the image creation code was changed to expect a list, then we
wouldn't need this class at all but could simply do INITRD +=
$(EARLY_UCODE_CPIO).

Ross