diff --git a/scripts/xtensa-build-zephyr.sh b/scripts/xtensa-build-zephyr.sh
index ce27053d2873..79de0005b634 100755
--- a/scripts/xtensa-build-zephyr.sh
+++ b/scripts/xtensa-build-zephyr.sh
@@ -7,8 +7,8 @@ set -e
 
 SOF_TOP=$(cd "$(dirname "$0")" && cd .. && pwd)
 
-SUPPORTED_PLATFORMS=(apl cnl icl tgl-h)
-# Default value, can be overridden on the command line
+SUPPORTED_PLATFORMS=(apl cnl icl tgl-h imx)
+# Default value, can (and sometimes must) be overridden with -p
 WEST_TOP="${SOF_TOP}"/zephyrproject
 BUILD_JOBS=$(nproc --all)
 RIMAGE_KEY=modules/audio/sof/keys/otc_private_key.pem
@@ -38,9 +38,13 @@ usage: $0 [options] platform(s)
        -k Path to a non-default rimage signing key.
        -c recursively clones Zephyr inside sof before building.
           Incompatible with -p.
-       -p Existing Zephyr project directory. Incompatible with -c.
-          If modules/audio/sof is missing there then a symbolic
-          link pointing to ${SOF_TOP} will be added.
+       -p Existing Zephyr project directory. Incompatible with -c.  If
+          zephyr-project/modules/audio/sof is missing then a
+          symbolic link pointing to ${SOF_TOP} will automatically be
+          created and west will recognize it as a new sof module.
+          This -p option is always _required_ if the real (not symbolic)
+          sof/ and zephyr-project/ directories are not nested in one
+          another.
 
 Supported platforms ${SUPPORTED_PLATFORMS[*]}
 
@@ -77,6 +81,12 @@ install_opts()
 build()
 {
 	cd "$WEST_TOP"
+	west topdir || {
+	    printf 'SOF_TOP=%s\nWEST_TOP=%s\n' "$SOF_TOP" "$WEST_TOP"
+	    die 'try the -p option?'
+	    # Also note west can get confused by symbolic links, see
+	    # https://github.com/zephyrproject-rtos/west/issues/419
+	}
 
 	# Build rimage
 	RIMAGE_DIR=build-rimage
@@ -89,11 +99,16 @@ build()
 	local STAGING=build-sof-staging
 	mkdir -p ${STAGING}/sof/ # smex does not use 'install -D'
 
+        # Default RIMAGE_KEY defined at the top of this file
 	for platform in "${PLATFORMS[@]}"; do
 		case "$platform" in
 			apl)
 				PLAT_CONFIG='intel_adsp_cavs15'
 				;;
+			imx)
+				PLAT_CONFIG='intel_adsp_cavs15'
+				RIMAGE_KEY='None'
+				;;
 			cnl)
 				PLAT_CONFIG='intel_adsp_cavs18'
 				;;
@@ -130,10 +145,12 @@ build()
 			       -l "$STAGING"/sof/sof-"$platform".ldc \
 			       "$bdir"/zephyr/zephyr.elf
 
+                        test "$RIMAGE_KEY" = 'None' ||
 			west sign  --build-dir "$bdir" \
 				--tool rimage --tool-path "$RIMAGE_DIR"/rimage \
 				--tool-data modules/audio/sof/rimage/config -- -k "$RIMAGE_KEY"
 		)
+                test "$RIMAGE_KEY" = 'None' ||
 		install_opts -m 0644 "$bdir"/zephyr/zephyr.ri \
 			     "$STAGING"/sof/community/sof-"$platform".ri
 	done
@@ -206,7 +223,7 @@ main()
 	if [ "x$DO_CLONE" == "xyes" ]; then
 		clone
 	else
-		# Link to ourselves if no sof module yet
+		# Symlink zephyr-project to our SOF selves if no sof west module yet
 		test -e "${WEST_TOP}"/modules/audio/sof || {
 		    mkdir -p "${WEST_TOP}"/modules/audio
 		    ln -s "$SOF_TOP" "${WEST_TOP}"/modules/audio/sof