intel-sof-firmware

#!/bin/sh
#
# intel-sof-firmware initramfs-tools hoook script
# Copyright(C) 2022 Johan Thelin <hello@e8johan.se>
# Released under the GPL v2 or later license
#
# Builds a cpio image containing the intel-sof-signed firmware files needed for
# the Dell XPS13 Plus (9320) and installs it to the early initramfs.
#
# Requires intel-sof-signed to be installed

PREREQ=""
prereqs()
{
	echo "$PREREQ"
}

case $1 in
prereqs)
	prereqs
        exit 0
        ;;
esac

. /usr/share/initramfs-tools/hook-functions

# Create temporary working space
EFW=$(mktemp -d "${TMPDIR:-/var/tmp}/mkinitramfs-EFW_XXXXXXXXXX") || {
    echo "E: intel-sof-firmware: cannot create temporary directory" >&2
    exit 1
}

# Populate file system tree with firmware files
EFWCD="${EFW}/d/usr/lib/firmware/intel"
mkdir -p "${EFWCD}/sof"
cp /usr/lib/firmware/intel/sof/sof-adl.ri "${EFWCD}/sof/"
mkdir -p "${EFWCD}/sof-tplg"
cp /usr/lib/firmware/intel/sof-tplg/sof-adl-rt1316-l12-rt714-l0.tplg "${EFWCD}/sof-tplg/"

# Create cpio image
EFWF="${EFS}/early-initramfs.cpio"
cd "${EFW}/d" ; find . -print0 | LC_ALL=C sort -z | cpio --null --reproducible -R 0:0 -H newc -o --quiet > "${EFWF}"

# Prepend cpio image to initramfs
prepend_earlyinitramfs "${EFWF}" || {
	[ -d "${EFW}" ] && rm -rf "${EFW}"
	echo "E: intel-sof-firmware: failed to create of prepend the early initramfs to the initramfs" >&2
	exit 0
}


# Clean up
[ -d "${EFW}" ] && rm -rf "${EFW}"

L41: s/EFS/EFW/ ?