1 files changed, 69 insertions, 0 deletions
diff --git a/include/fw/mrc.sh b/include/fw/mrc.sh
new file mode 100644
index 00000000..19003af7
--- /dev/null
+++ b/include/fw/mrc.sh
@@ -0,0 +1,69 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+# Logic based on util/chromeos/crosfirmware.sh in coreboot cfc26ce278.
+# Modifications in this version are Copyright 2021,2023-2025 Leah Rowe.
+# Original copyright detailed in repo: https://review.coreboot.org/coreboot/
+
+eval "`newvar MRC_board MRC_hash MRC_url MRC_url_bkup SHELLBALL`"
+
+extract_refcode()
+{
+	extract_mrc
+
+	# cbfstool after coreboot 4.13 changed the stage file attribute scheme,
+	# and refcode is extracted from an image using the old scheme. we use
+	# cbfstool from coreboot 4.11_branch, the tree used by ASUS KGPE-D16:
+
+	[ -z "$cbfstoolref" ] && \
+		err "cbfstoolref not set" "extract_refcode" "$@"
+
+	x_ mkdir -p "${_pre_dest%/*}"
+
+	x_ "$cbfstoolref" "$appdir/bios.bin" extract \
+	    -m x86 -n fallback/refcode -f "$appdir/ref" -r RO_SECTION
+
+	# enable the Intel GbE device, if told by offset MRC_refcode_gbe
+	[ -n "$MRC_refcode_gbe" ] && \
+		x_ dd if="config/snippet/1" of="$appdir/ref" bs=1 \
+		    seek=$MRC_refcode_gbe count=1 conv=notrunc; :
+
+	x_ mv "$appdir/ref" "$_pre_dest"
+}
+
+extract_mrc()
+{
+	[ -z "$MRC_board" ] && \
+		err "MRC_board unset" "extract_mrc" "$@"
+	[ -z "$CONFIG_MRC_FILE" ] && \
+		err "CONFIG_MRC_FILE unset" "extract_mrc" "$@"
+
+	SHELLBALL="chromeos-firmwareupdate-$MRC_board"
+
+	(
+		x_ cd "$appdir"
+		extract_partition "${MRC_url##*/}"
+		extract_archive "$SHELLBALL" .
+
+	) || err "mrc download/extract failure" "extract_mrc" "$@"
+
+	x_ "$cbfstool" "$appdir/"bios.bin extract -n mrc.bin \
+	    -f "${_pre_dest%/*}/mrc.bin" -r RO_SECTION
+}
+
+extract_partition()
+{
+	printf "Extracting ROOT-A partition\n"
+
+	ROOTP=$( printf "unit\nB\nprint\nquit\n" | \
+	    parted "${1%.zip}" 2>/dev/null | grep "ROOT-A" )
+
+	START=$(( $( echo $ROOTP | cut -f2 -d\ | tr -d "B" ) ))
+	SIZE=$(( $( echo $ROOTP | cut -f4 -d\ | tr -d "B" ) ))
+
+	x_ dd if="${1%.zip}" of="root-a.ext2" bs=1024 \
+	    skip=$(( $START / 1024 )) count=$(( $SIZE / 1024 ))
+
+	printf "cd /usr/sbin\ndump chromeos-firmwareupdate %s\nquit" \
+	    "$SHELLBALL" | debugfs "root-a.ext2" || \
+	    err "!extract shellball" "extract_partition" "$@"
+}