diff --git a/main/postmarketos-mkinitfs/APKBUILD b/main/postmarketos-mkinitfs/APKBUILD
index 574205701..5e108ee67 100644
--- a/main/postmarketos-mkinitfs/APKBUILD
+++ b/main/postmarketos-mkinitfs/APKBUILD
@@ -1,5 +1,5 @@
 pkgname=postmarketos-mkinitfs
-pkgver=0.7.21
+pkgver=0.8.0
 pkgrel=1
 pkgdesc="Tool to generate initramfs images for postmarketOS"
 url="https://postmarketos.org"
@@ -24,5 +24,5 @@ package() {
 	mkdir -p "$pkgdir/etc/postmarketos-mkinitfs/hooks/"
 }
 sha512sums="8be7f29394f8cd4e1c4b93f018f6314350f7e37e20d242c97284c1b112a106f882318a101bc0c70b391590b969023901580c677ee9f869850e90e69171a44e80  init.sh.in
-8b8c304c6962cfd1284e5631e32102d49da835bebf6d9d599c20e50849e16783aa1ade9f8d721160877e9bc1ae8d10da5e4588338d487eca5c4bfef62b7833fc  init_functions.sh
+44571b62e4d326355fa7d96add9a9115a89db3b6ce12c17aa4b0d5bd02d63d5b5d3152305af18795938bc9479d37b44e9a14268efa28a8c114c77ed498a7d65b  init_functions.sh
 3f918f8b5967b73e507c2ddf36dccc24fee98298f05ca23e22605400de95137f8877e09769616e7db388557c645fb45c03e1e6b5bab815ec9f853c318f0431f1  mkinitfs.sh"
diff --git a/main/postmarketos-mkinitfs/init_functions.sh b/main/postmarketos-mkinitfs/init_functions.sh
index 09dd9b3fe..a39c83952 100644
--- a/main/postmarketos-mkinitfs/init_functions.sh
+++ b/main/postmarketos-mkinitfs/init_functions.sh
@@ -102,19 +102,30 @@ find_root_partition() {
 	# mount_subpartitions() must get executed before calling
 	# find_root_partition(), so partitions from b) also get found.
 
-	# Try partitions in /dev/mapper and /dev/dm-* first
-	for id in pmOS_root crypto_LUKS; do
-		for path in /dev/mapper /dev/dm; do
-			DEVICE="$(blkid | grep "$path" | grep "$id" \
-				| cut -d ":" -f 1)"
-			[ -z "$DEVICE" ] || break 2
-		done
+	# Short circuit all autodetection logic if pmos_root= is supplied
+	# on the kernel cmdline
+	# shellcheck disable=SC2013
+	for x in $(cat /proc/cmdline); do
+		[ "$x" = "${x#pmos_root=}" ] && continue
+		DEVICE="${x#pmos_root=}"
 	done
 
+	# Try partitions in /dev/mapper and /dev/dm-* first
+	if [ -z "$DEVICE" ]; then
+		for id in pmOS_root crypto_LUKS; do
+			for path in /dev/mapper /dev/dm; do
+				DEVICE="$(blkid | grep "$path" | grep "$id" \
+					| cut -d ":" -f 1 | head -n 1)"
+				[ -z "$DEVICE" ] || break 2
+			done
+		done
+	fi
+
 	# Then try all devices
 	if [ -z "$DEVICE" ]; then
 		for id in pmOS_root crypto_LUKS; do
-			DEVICE="$(blkid | grep "$id" | cut -d ":" -f 1)"
+			DEVICE="$(blkid | grep "$id" | cut -d ":" -f 1 \
+				| head -n 1)"
 			[ -z "$DEVICE" ] || break
 		done
 	fi
@@ -122,6 +133,12 @@ find_root_partition() {
 }
 
 find_boot_partition() {
+	# shellcheck disable=SC2013
+	for x in $(cat /proc/cmdline); do
+		[ "$x" = "${x#pmos_boot=}" ] && continue
+		echo "${x#pmos_boot=}"
+		return
+	done
 	findfs LABEL="pmOS_boot"
 }