diff --git a/.github/workflows/crossdev.yml b/.github/workflows/crossdev.yml
index 044beba..e0b05b9 100644
--- a/.github/workflows/crossdev.yml
+++ b/.github/workflows/crossdev.yml
@@ -184,11 +184,125 @@ jobs:
           - target: x86_64-unknown-linux-musl
             gcc: true
             llvm: true
-          # Embedded or otherwise special targets
+          # Arm multilib target
           - target: arm-none-eabi
             args: --skip-system
             gcc: true
             llvm: false
+          # Cortex-M / ARMv6-M → ARMv8.1-M non-multilib targets
+          - target: armv6m-none-eabi
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv6s-m --with-mode=thumb --with-float=soft"'
+            gcc: true
+            llvm: false
+          - target: armv7m-none-eabi
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv7-m --with-mode=thumb --with-float=soft"'
+            gcc: true
+            llvm: false
+          - target: armv7em-none-eabi
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv7e-m --with-mode=thumb --with-float=soft"'
+            gcc: true
+            llvm: false
+          - target: armv7em-none-eabihf
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv7e-m --with-mode=thumb --with-fpu=fpv4-sp-d16 --with-float=hard"'
+            gcc: true
+            llvm: false
+          - target: armv7em-none-eabisf
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv7e-m --with-mode=thumb --with-fpu=fpv4-sp-d16 --with-float=softfp"'
+            gcc: true
+            llvm: false
+          - target: armv8m.base-none-eabi
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv8-m.base --with-mode=thumb --with-float=soft"'
+            gcc: true
+            llvm: false
+          - target: armv8m.main-none-eabi
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv8-m.main --with-mode=thumb --with-float=soft"'
+            gcc: true
+            llvm: false
+          - target: armv8m.main-none-eabihf
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv8-m.main --with-mode=thumb --with-fpu=fpv5-sp-d16 --with-float=hard"'
+            gcc: true
+            llvm: false
+          - target: armv8m.main-none-eabisf
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv8-m.main --with-mode=thumb --with-fpu=fpv5-sp-d16 --with-float=softfp"'
+            gcc: true
+            llvm: false
+          - target: armv8.1m.main-none-eabi
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv8.1-m.main+pacbti --with-mode=thumb --with-float=soft"'
+            gcc: true
+            llvm: false
+          - target: armv8.1m.main-none-eabihf
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv8.1-m.main+mve --with-mode=thumb --with-float=hard"'
+            gcc: true
+            llvm: false
+          - target: armv8.1m.main-none-eabisf
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv8.1-m.main+pacbti+fp --with-mode=thumb --with-float=softfp"'
+            gcc: true
+            llvm: false
+          ## Cortex-A / ARMv7-A, ARMv7-R, ARMv8-A non-multilib targets
+          - target: armv7a-none-eabi
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv7-a --with-mode=thumb --with-float=soft"'
+            gcc: true
+            llvm: false
+          - target: armv7a-none-eabihf
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv7-a --with-mode=thumb --with-fpu=vfpv3-d16 --with-float=hard"'
+            gcc: true
+            llvm: false
+          - target: armv7a-none-eabisf
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv7-a --with-mode=thumb --with-fpu=vfpv3-d16 --with-float=softfp"'
+            gcc: true
+            llvm: false
+          - target: armv7ve-none-eabihf
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv7ve --with-mode=thumb --with-fpu=neon-vfpv4 --with-float=hard"'
+            gcc: true
+            llvm: false
+          - target: armv7ve-none-eabisf
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv7ve --with-mode=thumb --with-fpu=neon-vfpv4 --with-float=softfp"'
+            gcc: true
+            llvm: false
+          - target: armv7r-none-eabihf
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv7-r --with-mode=thumb --with-fpu=vfpv3xd --with-float=hard"'
+            gcc: true
+            llvm: false
+          - target: armv7r-none-eabisf
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv7-r --with-mode=thumb --with-fpu=vfpv3xd --with-float=softfp"'
+            gcc: true
+            llvm: false
+          - target: armv8a-none-eabi
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv8-a --with-mode=thumb --with-float=soft"'
+            gcc: true
+            llvm: false
+          - target: armv8a-none-eabisf
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv8-a --with-mode=thumb --with-fpu=neon-fp-armv8 --with-float=softfp"'
+            gcc: true
+            llvm: false
+          - target: armv8a-none-eabihf
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv8-a --with-mode=thumb --with-fpu=neon-fp-armv8 --with-float=hard"'
+            gcc: true
+            llvm: false
+          ## Generic / ARMv5TE / ARMv7
+          # FIXME I should be able to build this, but we cant determine multilib from the tripple. It would require a 
+          #  flag like --no-multilib or mabye --env 'MULTILIB_USE="no"'?
+          #- target: arm-none-eabi
+          #  args: --skip-system --env 'EXTRA_ECONF="--disable-multilib --with-mode=thumb --with-float=soft"'
+          #  gcc: true
+          #  llvm: false
+          - target: armv7-none-eabi
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv7 --with-mode=thumb --with-float=soft"'
+            gcc: true
+            llvm: false
+          - target: armv7-none-eabihf
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv7 --with-mode=thumb --with-fpu=vfpv3-d16 --with-float=hard"'
+            gcc: true
+            llvm: false
+          - target: armv5te-none-eabi
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv5te --with-mode=arm --with-fpu=vfpv2 --with-float=softfp"'
+            gcc: true
+            llvm: false
+          - target: armv5te-none-eabihf
+            args: --skip-system --env 'EXTRA_ECONF="--with-arch=armv5te --with-mode=arm --with-fpu=vfpv2 --with-float=hard"'
+            gcc: true
+            llvm: false
+          # Embedded or otherwise special targets
           - target: avr
             args: --skip-system
             gcc: true
diff --git a/crossdev b/crossdev
index 25dea3f..fa29552 100755
--- a/crossdev
+++ b/crossdev
@@ -273,7 +273,7 @@ parse_target() {
 			KPKG="[none]"
 			LCAT="dev-embedded" LPKG="avr-libc"
 			GUSE+=" -openmp -fortran -go" # doesn't work
-			MULTILIB_USE="yes" #377039
+			MULTILIB_USE="yes" # avr requires multilib, that provides libgcc for all sub-architectures #378387, #377039
 			BUSE+=" cxx"
 			WITH_DEF_HEADERS="no"
 			;;
@@ -342,7 +342,8 @@ parse_target() {
 			# for that.
 			GUSE+=" zlib zstd"
 
-			# We need multilib for openmp to be built w/ -mgomp
+			# We need multilib for openmp to be built w/ -mgomp 
+			# https://gcc.gnu.org/legacy-ml/gcc-help/2020-01/msg00106.html
 			MULTILIB_USE="yes"
 			WITH_DEF_HEADERS="no"
 			;;
@@ -367,6 +368,7 @@ parse_target() {
 			GUSE+=" zlib zstd"
 
 			# We need multilib for openmp to be built w/ -mgomp
+			# https://gcc.gnu.org/legacy-ml/gcc-help/2020-01/msg00106.html
 			MULTILIB_USE="yes"
 			WITH_DEF_HEADERS="no"
 			;;
@@ -446,7 +448,7 @@ parse_target() {
 			;;
 
 		# Bare metal targets
-		*-newlib|*-elf|*-eabi|*-rtems*)
+		*-newlib|*-elf|*-eabi*|*-rtems*)
 			LPKG="newlib"
 			KPKG="[none]"
 			GMASK+=" default-stack-clash-protection hardened ssp"
@@ -454,7 +456,9 @@ parse_target() {
 			GUSE+=" -fortran" #589672, needs syscalls
 			GUSE+=" -hardened" #687598, needs -fstack-check=specific support
 			GUSE+=" -default-stack-clash-protection -ssp" # SSP isn't supported for freestanding anyway
-			MULTILIB_USE="yes" #407275
+			
+			[[ "$CTARGET" != armv*-eabi* ]] \
+				&& MULTILIB_USE="yes" #868636, #407275
 			WITH_DEF_HEADERS="no"
 			;;
 
@@ -546,7 +550,7 @@ parse_target() {
 		mingw*|*-mingw*) pie_support=no
 			;;
 		# Many bare-metal targets don't work with pie as-is
-		*-elf|*-eabi)
+		*-elf|*-eabi*)
 			# mips can't generate freestanding PIC:
 			#   cc1: error: position-independent code requires ‘-mabicalls’
 			# arm firmware packages don't expect pie-by-default:
@@ -1528,27 +1532,12 @@ set_portage() {
 
 	[[ ${pkg} == "[none]" ]] && return 0
 
-	case ${CTARGET} in
-		# avr requires multilib, that provides
-		# libgcc for all sub-architectures #378387
-		avr*)
-			mask+=" -multilib"
-			force+=" multilib"
-			;;
-		accel-nvptx*|nvptx*|*-newlib|*-elf|*-eabi)
-			# nvptx: needs multilib because of https://gcc.gnu.org/legacy-ml/gcc-help/2020-01/msg00106.html.
-			mask+=" -multilib"
-			force+=" multilib"
-			;;
-		*)
-			if [[ ${MULTILIB_USE} == "yes" ]] ; then
-				mask+=" -multilib"
-				force+=" multilib"
-			else
-				mask+=" multilib"
-			fi
-			;;
-	esac
+	if [[ ${MULTILIB_USE} == "yes" ]]; then
+		mask+=" -multilib"
+		force+=" multilib"
+	else
+		mask+=" multilib"
+	fi
 
 	set_use_mask ${pkg} "${mask}"
 	set_use_force ${pkg} "${force}"
@@ -1840,6 +1829,7 @@ doemerge() {
 
 	[[ ${pn} == "[none]" ]] && return 0
 
+	# MULTILIB_USE could be overriden at runtime
 	set_use ${pn} ${USE} $( [[ ${MULTILIB_USE} == "no" ]] && echo - )multilib
 
 	[[ ${INIT_TARGET_ONLY} == "yes" ]] && return 0
diff --git a/scripts/container_test.sh b/scripts/container_test.sh
index 4941a50..74af1c2 100755
--- a/scripts/container_test.sh
+++ b/scripts/container_test.sh
@@ -6,6 +6,7 @@ print_help() {
 	echo "Usage: $0 [OPTIONS]
 
 Options:
+  --env                 Specify env settings for binutils/gdb/gcc/kernel/libc. 
   --llvm                Use LLVM/Clang as a cross compiler
   --skip-system         Skip emerging the @system set after setting up crossdev.
   --tag <tag>           Specify the container tag to use. Default is 'latest'.
@@ -67,6 +68,10 @@ while [[ $# -gt 0 ]]; do
 			print_help
 			exit 0
 			;;
+		--env)
+			ENV_SETTINGS="$2"
+			shift 2
+			;;
 		--llvm)
 			USE_LLVM=1
 			shift 1
@@ -99,6 +104,9 @@ EXTRA_ARGS=()
 if [[ "${USE_LLVM}" -eq 1 ]]; then
 	EXTRA_ARGS+="--llvm"
 fi
+if [[ -v ENV_SETTINGS ]]; then
+	EXTRA_ARGS+=("--env" "${ENV_SETTINGS}")
+fi
 
 "${CONTAINER_ENGINE}" run -d \
 	--pull always \