--- a/defaults/initrd.defaults
+++ b/defaults/initrd.defaults
@@ -101,9 +101,11 @@ GK_UDEV_TIMEOUT=120
 GK_USERINTERACTION_DISABLED_STATEFILE='/tmp/user-interaction.disabled'
 
 CRYPT_ENV_FILE='/etc/CRYPT_ENV.conf'
-CRYPT_KEYFILE_ROOT='/tmp/root.key'
-CRYPT_KEYFILE_SWAP='/tmp/swap.key'
+CRYPT_ROOT_KEYDEV_FSTYPE='auto'
+CRYPT_ROOT_KEYFILE='/tmp/root.key'
 CRYPT_ROOT_OPENED_LOCKFILE='/tmp/ROOT.opened'
+CRYPT_SWAP_KEYDEV_FSTYPE='auto'
+CRYPT_SWAP_KEYFILE='/tmp/swap.key'
 CRYPT_SWAP_OPENED_LOCKFILE='/tmp/SWAP.opened'
 
 ZFS_ENC_ENV_FILE='/etc/ZFS_ENC_ENV.conf'
--- a/defaults/initrd.scripts
+++ b/defaults/initrd.scripts
@@ -1780,7 +1780,7 @@ openLUKS() {
 		exit 1
 	fi
 
-	case $1 in
+	case ${1} in
 		root)
 			local TYPE=ROOT
 			;;
@@ -1789,8 +1789,12 @@ openLUKS() {
 			;;
 	esac
 
-	eval local LUKS_DEVICE='"${CRYPT_'${TYPE}'}"' LUKS_NAME="$1" LUKS_KEY='"${CRYPT_'${TYPE}'_KEY}"'
-	eval local LUKS_KEYDEV='"${CRYPT_'${TYPE}'_KEYDEV}"' LUKS_TRIM='"${CRYPT_'${TYPE}'_TRIM}"'
+	local LUKS_NAME="${1}"
+	eval local LUKS_DEVICE='"${CRYPT_'${TYPE}'}"'
+	eval local LUKS_KEY='"${CRYPT_'${TYPE}'_KEY}"'
+	eval local LUKS_KEYDEV='"${CRYPT_'${TYPE}'_KEYDEV}"'
+	eval local LUKS_KEYDEV_FSTYPE='"${CRYPT_'${TYPE}'_KEYDEV_FSTYPE}"'
+	eval local LUKS_TRIM='"${CRYPT_'${TYPE}'_TRIM}"'
 	eval local OPENED_LOCKFILE='"${CRYPT_'${TYPE}'_OPENED_LOCKFILE}"'
 	local DEV_ERROR=0 KEY_ERROR=0 KEYDEV_ERROR=0
 	local mntkey="/mnt/key/" crypt_filter_ret=
@@ -1886,7 +1890,10 @@ openLUKS() {
 						# At this point a device was recognized, now let's see if the key is there
 						[ ! -d "${mntkey}" ] && mkdir -p "${mntkey}" >/dev/null 2>&1
 
-						if ! run mount -n -o ro ${REAL_LUKS_KEYDEV} ${mntkey} >/dev/null 2>&1
+						# determine fs -- 'auto' will not trigger module loading!
+						LUKS_KEYDEV_FSTYPE=$(determine_fs "${REAL_LUKS_KEYDEV}" "${LUKS_KEYDEV_FSTYPE}")
+
+						if ! run mount -n -t ${LUKS_KEYDEV_FSTYPE} -o ro ${REAL_LUKS_KEYDEV} ${mntkey} >/dev/null 2>&1
 						then
 							KEYDEV_ERROR=1
 							bad_msg "Mounting of device ${REAL_LUKS_KEYDEV} failed." ${CRYPT_SILENT}
--- a/defaults/linuxrc
+++ b/defaults/linuxrc
@@ -2,7 +2,7 @@
 
 # shellcheck source=initrd.defaults
 . /etc/initrd.defaults
-# shellche2ck source=initrd.scripts
+# shellcheck source=initrd.scripts
 . /etc/initrd.scripts
 
 # shellcheck source=/dev/null
@@ -257,6 +257,9 @@ do
 		root_keydev=*)
 			CRYPT_ROOT_KEYDEV=${x#*=}
 		;;
+		root_keydev_fstype=*)
+			CRYPT_ROOT_KEYDEV_FSTYPE=${x#*=}
+		;;
 		root_trim=*)
 			CRYPT_ROOT_TRIM=${x#*=}
 		;;
@@ -266,6 +269,9 @@ do
 		swap_keydev=*)
 			CRYPT_SWAP_KEYDEV=${x#*=}
 		;;
+		swap_keydev_fstype=*)
+			CRYPT_SWAP_KEYDEV_FSTYPE=${x#*=}
+		;;
 		real_resume=*|resume=*)
 			REAL_RESUME=${x#*=}
 		;;
--- a/defaults/login-remote.sh
+++ b/defaults/login-remote.sh
@@ -24,10 +24,10 @@ fi
 receivefile() {
 	case ${1} in
 		root)
-			file=${CRYPT_KEYFILE_ROOT}
+			file=${CRYPT_ROOT_KEYFILE}
 			;;
 		swap)
-			file=${CRYPT_KEYFILE_SWAP}
+			file=${CRYPT_SWAP_KEYFILE}
 			;;
 		'')
 			bad_msg "No keyfile specified." "${CRYPT_SILENT}"
--- a/defaults/unlock-luks.sh
+++ b/defaults/unlock-luks.sh
@@ -43,8 +43,11 @@ main() {
 		exit 1
 	fi
 
-	eval local LUKS_DEVICE='"${CRYPT_'${TYPE}'}"' LUKS_NAME="${NAME}" LUKS_KEY='"${CRYPT_KEYFILE_'${TYPE}'}"'
-	eval local LUKS_TRIM='"${CRYPT_'${TYPE}'_TRIM}"' OPENED_LOCKFILE='"${CRYPT_'${TYPE}'_OPENED_LOCKFILE}"'
+	local LUKS_NAME="${NAME}"
+	eval local LUKS_DEVICE='"${CRYPT_'${TYPE}'}"'
+	eval local LUKS_KEY='"${CRYPT_'${TYPE}'_KEYFILE}"'
+	eval local LUKS_TRIM='"${CRYPT_'${TYPE}'_TRIM}"'
+	eval local OPENED_LOCKFILE='"${CRYPT_'${TYPE}'_OPENED_LOCKFILE}"'
 
 	while true
 	do
--- a/doc/genkernel.8.txt
+++ b/doc/genkernel.8.txt
@@ -646,6 +646,9 @@ recognized by the kernel itself.
     root_key.   If unset while using root_key, it will automatically
     look for the device in every boot.
 
+*root_keydev_fstype*=<...>::
+    Used filesystem for *root_keydev*. See *rootfstype* for more details.
+
 *root_trim*=(yes|no)::
     Enables TRIM support for a LUKS-based root device.  Only useful
     with SSD setups.  Have a look at 'https://en.wikipedia.org/wiki/TRIM'
@@ -657,6 +660,9 @@ recognized by the kernel itself.
 *swap_keydev*=<...>::
     Same as root_keydev for swap.
 
+*swap_keydev_fstype*=<...>::
+    Used filesystem for *swap_keydev*. See *rootfstype* for more details.
+
 *crypt_silent*::
     Set this to silent all the output related to the cryptographic
     software,  and in case your encrypted device isn't open with the
@@ -790,7 +796,8 @@ when not set. This will allow remote user to provide answer through
 *rootfstype*=<...>::
     Specify the file system type to mount the real root filesystem as.
     This can be useful when support for ext2/ext3/ext4 are
-    in competition.  Default is "auto".
+    in competition or used filesystem was not built into kernel.
+    Default is "auto".
 
 *docache*::
 *nocache*::
--- a/gen_determineargs.sh
+++ b/gen_determineargs.sh
@@ -415,7 +415,6 @@ determine_real_args() {
 	set_config_with_override BOOL   GENZIMAGE                             CMD_GENZIMAGE                             "no"
 	set_config_with_override BOOL   KEYMAP                                CMD_KEYMAP                                "yes"
 	set_config_with_override BOOL   DOKEYMAPAUTO                          CMD_DOKEYMAPAUTO                          "no"
-	set_config_with_override STRING BUSYBOX_CONFIG                        CMD_BUSYBOX_CONFIG
 	set_config_with_override STRING STRIP_TYPE                            CMD_STRIP_TYPE                            "modules"
 	set_config_with_override BOOL   INSTALL                               CMD_INSTALL                               "yes"
 	set_config_with_override BOOL   CLEANUP                               CMD_CLEANUP                               "yes"
--- a/gen_funcs.sh
+++ b/gen_funcs.sh
@@ -1853,7 +1853,7 @@ check_disk_space_requirements() {
 			gen_die "--check-free-disk-space-bootdir value '${CHECK_FREE_DISK_SPACE_BOOTDIR}' is not a valid number!"
 		fi
 
-		available_free_disk_space=$(unset POSIXLY_CORRECT && df -BM "${BOOTDIR}" | awk '$3 ~ /[0-9]+/ { print $4 }')
+		available_free_disk_space=$(unset POSIXLY_CORRECT && LC_ALL="C" df -BM "${BOOTDIR}" | awk '$3 ~ /[0-9]+/ { print $4 }')
 		if [ -n "${available_free_disk_space}" ]
 		then
 			print_info 2 '' 1 0
@@ -1890,7 +1890,7 @@ check_disk_space_requirements() {
 			gen_die "--check-free-disk-space-kerneloutputdir value '${CHECK_FREE_DISK_SPACE_KERNELOUTPUTDIR}' is not a valid number!"
 		fi
 
-		available_free_disk_space=$(unset POSIXLY_CORRECT && df -BM "${KERNEL_OUTPUTDIR}" | awk '$3 ~ /[0-9]+/ { print $4 }')
+		available_free_disk_space=$(unset POSIXLY_CORRECT && LC_ALL="C" df -BM "${KERNEL_OUTPUTDIR}" | awk '$3 ~ /[0-9]+/ { print $4 }')
 		if [ -n "${available_free_disk_space}" ]
 		then
 			print_info 2 '' 1 0
--- a/genkernel.conf
+++ b/genkernel.conf
@@ -378,7 +378,7 @@ DEFAULT_KERNEL_SOURCE="/usr/src/linux"
 # Compress generated initramfs
 #COMPRESS_INITRD="yes"
 
-# Types of compression: best, xz, lzma, bzip2, gzip, lzop, fastest
+# Types of compression: best, xz, lzma, bzip2, gzip, lzop, lz4, zstd, fastest
 # "best" selects the best available compression method
 # "fastest" selects the fastest available compression method
 #COMPRESS_INITRD_TYPE="best"