diff --git a/.github/workflows/llext.yml b/.github/workflows/llext.yml
index 24b48312501b..adc732a7417b 100644
--- a/.github/workflows/llext.yml
+++ b/.github/workflows/llext.yml
@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        platform: [mtl, lnl]
+        platform: [mtl]
 
     steps:
       - name: git clone sof
@@ -34,8 +34,10 @@ jobs:
       - name: llext build
         run: |
           cd workspace && ./sof/zephyr/docker-run.sh /bin/sh -c \
-             'ln -s  /opt/toolchains/zephyr-sdk-*  ~/;
-              west build --board intel_adsp_ace15_mtpm sof/app              \
-              -- -DEXTRA_CFLAGS=-Werror -DEXTRA_CXXFLAGS=-Werror     \
-              -DEXTRA_AFLAGS=-Werror \
-              -DOVERLAY_CONFIG=overlays/mtl/module_overlay.conf'
+             "ln -s  /opt/toolchains/zephyr-sdk-*  ~/;
+              python sof/scripts/xtensa-build-zephyr.py \
+              --cmake-args=-DEXTRA_CFLAGS=-Werror \
+              --cmake-args=-DEXTRA_CXXFLAGS=-Werror \
+              --cmake-args=-DEXTRA_AFLAGS='-Werror -Wa,--fatal-warnings' \
+              --cmake-args=--warn-uninitialized \
+              --overlay=sof/app/overlays/mtl/module_overlay.conf ${{ matrix.platform }}"
diff --git a/scripts/llext_link_helper.py b/scripts/llext_link_helper.py
index cfd3d5205fec..a739fc25ab96 100755
--- a/scripts/llext_link_helper.py
+++ b/scripts/llext_link_helper.py
@@ -58,7 +58,8 @@ def main():
 		try:
 			offset = elf.get_section_by_name(sections[i]).header.sh_offset
 			size = elf.get_section_by_name(sections[i]).header.sh_size
-		except:
+		except AttributeError:
+			print("section " + sections[i] + " not found in " + args.file)
 			continue
 
 		if last_increment == 0:
diff --git a/scripts/xtensa-build-zephyr.py b/scripts/xtensa-build-zephyr.py
index aab811fabc79..2b4ab65b4e6c 100755
--- a/scripts/xtensa-build-zephyr.py
+++ b/scripts/xtensa-build-zephyr.py
@@ -63,6 +63,8 @@
 
 sof_fw_version = None
 
+signing_key = None
+
 if py_platform.system() == "Windows":
 	xtensa_tools_version_postfix = "-win32"
 elif py_platform.system() == "Linux":
@@ -601,7 +603,7 @@ def clean_staging(platform):
 def rimage_west_configuration(platform_dict, dest_dir):
 	"""Configure rimage in a new file `dest_dir/westconfig.ini`, starting
 	from the workspace .west/config.
-	Returns the pathlib.Path to the new file.
+	Returns a tuple (west ConfigFile, pathlib.Path to that new file).
 	"""
 
 	saved_local_var = os.environ.get('WEST_CONFIG_LOCAL')
@@ -641,7 +643,7 @@ def rimage_west_configuration(platform_dict, dest_dir):
 
 	platform_wconfig.set("rimage.extra-args", shlex.join(extra_args))
 
-	return platform_west_config_path
+	return platform_wconfig, platform_west_config_path
 
 
 def build_rimage():
@@ -671,12 +673,12 @@ def rimage_options(platform_dict):
 	example: [ (-f, 2.5.0), (-b, 1), (-k, key.pem),... ]
 
 	"""
+	global signing_key
 	opts = []
 
 	if args.verbose > 0:
 		opts.append(("-v",) * args.verbose)
 
-	signing_key = None
 	if args.key:
 		key_path = pathlib.Path(args.key)
 		assert key_path.exists(), f"{key_path} not found"
@@ -831,10 +833,11 @@ def build_platforms():
 	see https://docs.zephyrproject.org/latest/guides/west/build-flash-debug.html#one-time-cmake-arguments
 	Try "west config build.cmake-args -- ..." instead.""")
 
-		platf_build_environ['WEST_CONFIG_LOCAL'] = str(rimage_west_configuration(
+		platform_wcfg, wcfg_path = rimage_west_configuration(
 			platform_dict,
 			STAGING_DIR / "sof-info" / platform
-		))
+		)
+		platf_build_environ['WEST_CONFIG_LOCAL'] = str(wcfg_path)
 
 		# Make sure the build logs don't leave anything hidden
 		execute_command(['west', 'config', '-l'], cwd=west_top,
@@ -869,7 +872,7 @@ def build_platforms():
 		if platform not in RI_INFO_UNSUPPORTED:
 			reproducible_checksum(platform, west_top / platform_build_dir_name / "zephyr" / "zephyr.ri")
 
-		install_platform(platform, sof_platform_output_dir, platf_build_environ)
+		install_platform(platform, sof_platform_output_dir, platf_build_environ, platform_wcfg)
 
 	src_dest_list = []
 	tools_output_dir = pathlib.Path(STAGING_DIR, "tools")
@@ -902,7 +905,69 @@ def build_platforms():
 			symlinks=True, ignore_dangling_symlinks=True, dirs_exist_ok=True)
 
 
-def install_platform(platform, sof_output_dir, platf_build_environ):
+def install_lib(sof_lib_dir, abs_build_dir, platform_wconfig):
+	"""[summary] Sign loadable llext modules, if any, copy them to the
+	deployment tree and create UUID links for the kernel to find and load
+	them."""
+
+	global signing_key
+
+	with os.scandir(str(abs_build_dir)) as iter:
+		if args.key_type_subdir != "none":
+			sof_lib_dir = sof_lib_dir / args.key_type_subdir
+
+		sof_lib_dir.mkdir(parents=True, exist_ok=True)
+
+		for entry in iter:
+			if (not entry.is_dir or
+			    not entry.name.endswith('_llext')):
+				continue
+
+			entry_path = pathlib.Path(entry.path)
+
+			uuids = entry_path / 'llext.uuid'
+			if not os.path.exists(uuids):
+				print(f"Directory {entry.name} has no llext.uuid file. Skipping.")
+				continue
+
+			# replace '_llext' with '.llext', e.g.
+			# eq_iir_llext/eq_iir.llext
+			llext_base = entry.name[:-6]
+			llext_file = llext_base + '.llext'
+
+			dst = sof_lib_dir / llext_file
+
+			rimage_cfg = entry_path / 'rimage_config.toml'
+			llext_input = entry_path / (llext_base + '.so')
+			llext_output = entry_path / llext_file
+
+			sign_cmd = [str(platform_wconfig.get("rimage.path")), "-o", str(llext_output),
+				    "-e", "-c", str(rimage_cfg),
+				    "-k", str(signing_key), "-l", "-r",
+				    str(llext_input)]
+			execute_command(sign_cmd, cwd=west_top)
+
+			# An intuitive way to make this multiline would be
+			# with (open(dst, 'wb') as fdst, open(llext_output, 'rb') as fllext,
+			#	open(llext_output.with_suffix('.llext.xman'), 'rb') as fman):
+			# but a Python version, used on Windows errored out on this.
+			# Thus we're left with a choice between a 150-character
+			# long line and an illogical split like this
+			with open(dst, 'wb') as fdst, open(llext_output, 'rb') as fllext, open(
+				  llext_output.with_suffix('.llext.xman'), 'rb') as fman:
+				# Concatenate the manifest and the llext
+				shutil.copyfileobj(fman, fdst)
+				shutil.copyfileobj(fllext, fdst)
+
+			# Create symbolic links for all UUIDs
+			with open(uuids, 'r') as uuids_f:
+				for uuid in uuids_f:
+					linkname = uuid.strip() + '.bin'
+					symlink_or_copy(sof_lib_dir, llext_file,
+							sof_lib_dir, linkname)
+
+
+def install_platform(platform, sof_output_dir, platf_build_environ, platform_wconfig):
 
 	# Keep in sync with caller
 	platform_build_dir_name = f"build-{platform}"
@@ -948,6 +1013,10 @@ def install_platform(platform, sof_output_dir, platf_build_environ):
 			for p_alias in platform_configs[platform].aliases:
 				symlink_or_copy(install_key_dir, output_fwname, install_key_dir, f"sof-{p_alias}.ri")
 
+	if args.deployable_build and platform_configs[platform].ipc4:
+		install_lib(sof_output_dir / '..' / 'sof-ipc4-lib' / platform, abs_build_dir,
+			    platform_wconfig)
+
 
 	# sof-info/ directory
 
@@ -1033,7 +1102,6 @@ class InstFile:
 		gzip_res.result() # throws exception if gzip unexpectedly failed
 	gzip_threads.shutdown()
 
-
 # Zephyr's CONFIG_KERNEL_BIN_NAME default value
 BIN_NAME = 'zephyr'
 
diff --git a/src/library_manager/llext_manager.c b/src/library_manager/llext_manager.c
index 6f41222348b6..9d32023b2aa5 100644
--- a/src/library_manager/llext_manager.c
+++ b/src/library_manager/llext_manager.c
@@ -37,6 +37,14 @@
 #include <stddef.h>
 #include <stdint.h>
 
+/*
+ * FIXME: this definition is copied from tools/rimage/src/include/rimage/manifest.h
+ * which we cannot easily include here, because it also pulls in
+ * tools/rimage/src/include/rimage/elf.h which then conflicts with
+ * zephyr/include/zephyr/llext/elf.h
+ */
+#define FILE_TEXT_OFFSET_V1_8		0x8000
+
 LOG_MODULE_DECLARE(lib_manager, CONFIG_SOF_LOG_LEVEL);
 
 extern struct tr_ctx lib_manager_tr;
@@ -172,11 +180,10 @@ static int llext_manager_link(struct sof_man_fw_desc *desc, struct sof_man_modul
 			      uint32_t module_id, struct module_data *md, const void **buildinfo,
 			      const struct sof_man_module_manifest **mod_manifest)
 {
-	size_t mod_size = desc->header.preload_page_count * PAGE_SZ - 0x8000;
-	/* FIXME: where does the module begin?? */
+	size_t mod_size = desc->header.preload_page_count * PAGE_SZ - FILE_TEXT_OFFSET_V1_8;
 	struct llext_buf_loader ebl = LLEXT_BUF_LOADER((uint8_t *)desc -
-						       SOF_MAN_ELF_TEXT_OFFSET + 0x8000,
-						       mod_size);
+						SOF_MAN_ELF_TEXT_OFFSET + FILE_TEXT_OFFSET_V1_8,
+						mod_size);
 	struct lib_manager_mod_ctx *ctx = lib_manager_get_mod_ctx(module_id);
 	/* Identify if this is the first time loading this module */
 	struct llext_load_param ldr_parm = {!ctx->segment_size[SOF_MAN_SEGMENT_TEXT]};
diff --git a/src/samples/audio/smart_amp_test.toml b/src/samples/audio/smart_amp_test.toml
index 3e02feac280d..5f6b53b45554 100644
--- a/src/samples/audio/smart_amp_test.toml
+++ b/src/samples/audio/smart_amp_test.toml
@@ -1,3 +1,7 @@
+#ifndef LOAD_TYPE
+#define LOAD_TYPE "0"
+#endif
+
 	REM # smart amp test module config
 	[[module.entry]]
 	name = "SMATEST"
@@ -5,7 +9,7 @@
 	affinity_mask = "0x1"
 	instance_count = "1"
 	domain_types = "0"
-	load_type = "0"
+	load_type = LOAD_TYPE
 	init_config = "1"
 	module_type = "0xD"
 	auto_start = "0"
diff --git a/src/samples/audio/smart_amp_llext/CMakeLists.txt b/src/samples/audio/smart_amp_test_llext/CMakeLists.txt
similarity index 67%
rename from src/samples/audio/smart_amp_llext/CMakeLists.txt
rename to src/samples/audio/smart_amp_test_llext/CMakeLists.txt
index 2e57380bf65b..265290e38a75 100644
--- a/src/samples/audio/smart_amp_llext/CMakeLists.txt
+++ b/src/samples/audio/smart_amp_test_llext/CMakeLists.txt
@@ -1,6 +1,10 @@
 # Copyright (c) 2023 Intel Corporation.
 # SPDX-License-Identifier: Apache-2.0
 
+# FIXME: This *WILL* be converted to add_llext_target() as long as that's
+# reasonably possible, and if it isn't, a *significant* effort will be made to
+# make that possible
+
 cmake_minimum_required(VERSION 3.20.0)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(smart_amp_test)
@@ -10,6 +14,16 @@ SET_PROPERTY(GLOBAL PROPERTY TARGET_SUPPORTS_SHARED_LIBS TRUE)
 set(MODULE "smart_amp_test")
 cmake_path(SET SOF_BASE NORMALIZE ${PROJECT_SOURCE_DIR}/../../../..)
 
+file(STRINGS ${CMAKE_CURRENT_LIST_DIR}/../${MODULE}.toml uuids REGEX "^[ \t]*uuid *=")
+
+file(WRITE ${PROJECT_BINARY_DIR}/llext.uuid "")
+
+foreach(line IN LISTS uuids)
+	# extract UUID value - drop the 'uuid = ' part of the assignment line
+	string(REGEX REPLACE "^[ \t]*uuid *= \"([0-9A-F\-]*)\"" "\\1" uuid ${line})
+	file(APPEND ${PROJECT_BINARY_DIR}/llext.uuid "${uuid}\n")
+endforeach()
+
 add_library(${MODULE} SHARED)
 
 target_sources(${MODULE} PRIVATE
@@ -55,12 +69,12 @@ target_compile_options(${MODULE} PRIVATE
 
 if("${ZEPHYR_TOOLCHAIN_VARIANT}" STREQUAL "zephyr")
 set(MODULE_LINKER_PARAMS -nostdlib -nodefaultlibs)
-set(EXTRA_LINKED_PARAMS -shared)
-set(COPY_CMD ${CMAKE_STRIP} -R .xt.* -o ${MODULE}_out.so ${MODULE}_llext.so)
+set(EXTRA_LINKER_PARAMS -shared)
+set(COPY_CMD ${CMAKE_STRIP} -R .xt.* -o ${MODULE}.so ${MODULE}_pre.so)
 else()
 set(MODULE_LINKER_PARAMS -nostdlib -nodefaultlibs -r)
-set(EXTRA_LINKED_PARAMS)
-set(COPY_CMD ${CMAKE_OBJCOPY} -R .xt.* ${MODULE}_llext.so ${MODULE}_out.so)
+set(EXTRA_LINKER_PARAMS)
+set(COPY_CMD ${CMAKE_OBJCOPY} -R .xt.* ${MODULE}_pre.so ${MODULE}.so)
 endif()
 
 target_link_options(${MODULE} PRIVATE
@@ -69,10 +83,14 @@ target_link_options(${MODULE} PRIVATE
 
 add_custom_command(OUTPUT lib${MODULE}_out.so
 	DEPENDS ${MODULE}
+	COMMAND ${CMAKE_C_COMPILER} -E ${CMAKE_CURRENT_LIST_DIR}/llext.toml.h -P -DREM=
+		-I${SOF_BASE} -I${SOF_BASE}src
+		-imacros ../include/generated/autoconf.h
+		-o rimage_config.toml
 	COMMAND ${SOF_BASE}scripts/llext_link_helper.py
 		-f lib${MODULE}.so -t "0xa06ca000" ${CMAKE_C_COMPILER} --
-		${MODULE_LINKER_PARAMS} ${EXTRA_LINKED_PARAMS} -fPIC
-		-o ${MODULE}_llext.so $<TARGET_OBJECTS:${MODULE}>
+		${MODULE_LINKER_PARAMS} ${EXTRA_LINKER_PARAMS} -fPIC
+		-o ${MODULE}_pre.so $<TARGET_OBJECTS:${MODULE}>
 	COMMAND ${COPY_CMD}
 	COMMAND_EXPAND_LISTS
 )
diff --git a/src/samples/audio/smart_amp_llext/llext.toml.h b/src/samples/audio/smart_amp_test_llext/llext.toml.h
similarity index 83%
rename from src/samples/audio/smart_amp_llext/llext.toml.h
rename to src/samples/audio/smart_amp_test_llext/llext.toml.h
index 350cdc076e06..eb6fcfac7d24 100644
--- a/src/samples/audio/smart_amp_llext/llext.toml.h
+++ b/src/samples/audio/smart_amp_test_llext/llext.toml.h
@@ -1,4 +1,5 @@
 #include <tools/rimage/config/platform.toml>
+#define LOAD_TYPE "2"
 #include "../smart_amp_test.toml"
 
 [module]
diff --git a/zephyr/CMakeLists.txt b/zephyr/CMakeLists.txt
index f58176df6695..e6889be1187b 100644
--- a/zephyr/CMakeLists.txt
+++ b/zephyr/CMakeLists.txt
@@ -794,8 +794,8 @@ if(CONFIG_IPC_MAJOR_3)
 	)
 elseif(CONFIG_IPC_MAJOR_4)
 	if(CONFIG_SAMPLE_SMART_AMP STREQUAL "m")
-		add_subdirectory(${SOF_SAMPLES_PATH}/audio/smart_amp_llext
-				 ${PROJECT_BINARY_DIR}/smart_amp_llext)
+		add_subdirectory(${SOF_SAMPLES_PATH}/audio/smart_amp_test_llext
+				 ${PROJECT_BINARY_DIR}/smart_amp_test_llext)
 		add_dependencies(app smart_amp_test_llext)
 	elseif(CONFIG_SAMPLE_SMART_AMP)
 		zephyr_library_sources(