--- zzzz-none-000/linux-3.10.107/scripts/gen_initramfs_list.sh	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/scripts/gen_initramfs_list.sh	2021-02-04 17:41:59.000000000 +0000
@@ -59,6 +59,18 @@
 	EOF
 }
 
+list_openwrt_initramfs() {
+	:
+}
+
+openwrt_initramfs() {
+	# make sure that /dev/console exists
+	cat <<-EOF >> ${output}
+		dir /dev 0755 0 0
+		nod /dev/console 0600 0 0 c 5 1
+	EOF
+}
+
 filetype() {
 	local argv1="$1"
 
@@ -177,6 +189,8 @@
 	if [  "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then
 		${dep_list}print_mtime "$1"
 
+		${dep_list}openwrt_initramfs
+
 		echo "${dirlist}" | \
 		while read x; do
 			${dep_list}parse ${x}
@@ -226,7 +240,7 @@
 output="/dev/stdout"
 output_file=""
 is_cpio_compressed=
-compr="gzip -n -9 -f"
+compr="gzip -n -9 -f -"
 
 arg="$1"
 case "$arg" in
@@ -240,12 +254,24 @@
 		output_file="$1"
 		cpio_list="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)"
 		output=${cpio_list}
-		echo "$output_file" | grep -q "\.gz$" && compr="gzip -n -9 -f"
-		echo "$output_file" | grep -q "\.bz2$" && compr="bzip2 -9 -f"
-		echo "$output_file" | grep -q "\.lzma$" && compr="lzma -9 -f"
-		echo "$output_file" | grep -q "\.xz$" && \
-				compr="xz --check=crc32 --lzma2=dict=1MiB"
-		echo "$output_file" | grep -q "\.lzo$" && compr="lzop -9 -f"
+		echo "$output_file" | grep -q "\.gz$" \
+                && [ -x "`which gzip 2> /dev/null`" ] \
+                && compr="gzip -n -9 -f -"
+		echo "$output_file" | grep -q "\.bz2$" \
+                && [ -x "`which bzip2 2> /dev/null`" ] \
+                && compr="bzip2 -9 -f -"
+		echo "$output_file" | grep -q "\.lzma$" \
+                && [ -x "`which lzma 2> /dev/null`" ] \
+                && compr="lzma e -d20 -lc1 -lp2 -pb2 -eos -si -so"
+		echo "$output_file" | grep -q "\.xz$" \
+                && [ -x "`which xz 2> /dev/null`" ] \
+                && compr="xz --check=crc32 --lzma2=dict=1MiB"
+		echo "$output_file" | grep -q "\.lzo$" \
+                && [ -x "`which lzop 2> /dev/null`" ] \
+                && compr="lzop -9 -f"
+		echo "$output_file" | grep -q "\.lz4$" \
+                && [ -x "`which lz4 2> /dev/null`" ] \
+                && compr="lz4 -l -9 -f"
 		echo "$output_file" | grep -q "\.cpio$" && compr="cat"
 		shift
 		;;
@@ -303,7 +329,7 @@
 	if [ "${is_cpio_compressed}" = "compressed" ]; then
 		cat ${cpio_tfile} > ${output_file}
 	else
-		(cat ${cpio_tfile} | ${compr}  - > ${output_file}) \
+		(cat ${cpio_tfile} | ${compr} > ${output_file}) \
 		|| (rm -f ${output_file} ; false)
 	fi
 	[ -z ${cpio_file} ] && rm ${cpio_tfile}