sys-kernel/coreos-kernel: include microcode

Include microcode via the CONFIG_EXTRA_FIRMWARE option since prepending
a cpio archive to bootengine.cpio doesn't work (needs to be a seperate
initrd).

sdk_container/src/third_party/coreos-overlay/sys-kernel/coreos-kernel/coreos-kernel-4.14.14-r1.ebuild

@@ -26,10 +26,11 @@ DEPEND="${RDEPEND}
 	sys-fs/e2fsprogs
 	sys-fs/mdadm
 	sys-fs/xfsprogs
-	>=sys-kernel/coreos-firmware-20160331-r1:=
+	>=sys-kernel/coreos-firmware-20180103-r1:=
 	>=sys-kernel/bootengine-0.0.4:=
 	sys-kernel/dracut
-	virtual/udev"
+	virtual/udev
+	amd64? ( sys-firmware/intel-microcode )"
 
 # We are bad, we want to get around the sandbox.  So do the creation of the
 # cpio image in pkg_setup() where we are free to mount filesystems, chroot,
@@ -60,6 +61,12 @@ src_prepare() {
 	# Symlink to bootengine.cpio so we can stick with relative paths in .config
 	ln -sv "${ROOT}"/usr/share/bootengine/bootengine.cpio build/ || die
 	config_update 'CONFIG_INITRAMFS_SOURCE="bootengine.cpio"'
+
+	# include all intel and amd microcode files, avoiding the signatures
+	local fw_dir="${ROOT}lib/firmware"
+	use amd64 && config_update "CONFIG_EXTRA_FIRMWARE=\"$(find ${fw_dir} -type f \
+		\( -path ${fw_dir}'/intel-ucode/*' -o -path ${fw_dir}'/amd-ucode/*' \) -printf '%P ')\""
+	use amd64 && config_update "CONFIG_EXTRA_FIRMWARE_DIR=\"${fw_dir}\""
 }
 
 src_compile() {