diff --git a/src/audio/buffers/comp_buffer.c b/src/audio/buffers/comp_buffer.c
index 62f90bd2b5c9..f94260ecd42f 100644
--- a/src/audio/buffers/comp_buffer.c
+++ b/src/audio/buffers/comp_buffer.c
@@ -544,6 +544,10 @@ void buffer_attach(struct comp_buffer *buffer, struct list_item *head, int dir)
 {
 	struct list_item *list = buffer_comp_list(buffer, dir);
 	CORE_CHECK_STRUCT(&buffer->audio_buffer);
+	if (!head || !head->next)
+		printk("E: attach head=%p next=%p\n", head, head ? head->next : 0);
+	if (!list || !list->next)
+		printk("E: attach list=%p next=%p\n", list, list ? list->next : 0);
 	list_item_prepend(list, head);
 }
 
diff --git a/src/audio/copier/copier_ipcgtw.c b/src/audio/copier/copier_ipcgtw.c
index 20d20b864652..3491818fbe61 100644
--- a/src/audio/copier/copier_ipcgtw.c
+++ b/src/audio/copier/copier_ipcgtw.c
@@ -263,6 +263,7 @@ int copier_ipcgtw_create(struct comp_dev *dev, struct copier_data *cd,
 		goto e_ipcgtw;
 	}
 
+	printk("ipcgtwcreate: ep create %d\n", cd->endpoint_num);
 	if (cd->direction == SOF_IPC_STREAM_PLAYBACK) {
 		comp_buffer_connect(dev, config->core,
 				    cd->endpoint_buffer[cd->endpoint_num],
diff --git a/src/drivers/Kconfig b/src/drivers/Kconfig
index ad3be8d1a564..43fdc40023cd 100644
--- a/src/drivers/Kconfig
+++ b/src/drivers/Kconfig
@@ -2,8 +2,6 @@
 
 menu "Drivers"
 
-rsource "intel/Kconfig"
-
 rsource "dw/Kconfig"
 
 rsource "imx/Kconfig"
diff --git a/src/drivers/intel/Kconfig b/src/drivers/intel/Kconfig
deleted file mode 100644
index b7e465758ec2..000000000000
--- a/src/drivers/intel/Kconfig
+++ /dev/null
@@ -1,10 +0,0 @@
-# SPDX-License-Identifier: BSD-3-Clause
-
-# TODO: to be removed once Zephyr SSP driver has been updated
-#       not to depend on this
-config INTEL_MN
-	bool
-	depends on CAVS
-	default n
-	help
-	  Select this if the platform supports M/N dividers.
diff --git a/src/include/sof/drivers/mn.h b/src/include/sof/drivers/mn.h
deleted file mode 100644
index 004d907bfad9..000000000000
--- a/src/include/sof/drivers/mn.h
+++ /dev/null
@@ -1,87 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause
- *
- * Copyright(c) 2020 Intel Corporation. All rights reserved.
- *
- * Author: Janusz Jankowski <janusz.jankowski@linux.intel.com>
- */
-
-#ifndef __SOF_DRIVERS_MN_H__
-#define __SOF_DRIVERS_MN_H__
-
-#include <platform/drivers/mn.h>
-#include <rtos/sof.h>
-
-#include <stdbool.h>
-#include <stdint.h>
-
-/**
- * \brief Initializes MN driver.
- */
-void mn_init(struct sof *sof);
-
-/**
- * \brief Finds and sets valid combination of MCLK source and divider to
- *	  achieve requested MCLK rate.
- *	  User should release clock when it is no longer needed to allow
- *	  driver to change MCLK M/N source when user count drops to 0.
- *	  M value of M/N is not supported for MCLK, only divider can be used.
- * \param[in] mclk_id id of main clock for which rate should be set.
- * \param[in] mclk_rate main clock frequency.
- * \return 0 on success otherwise a negative error code.
- */
-int mn_set_mclk(uint16_t mclk_id, uint32_t mclk_rate);
-
-/**
- * \brief set mclk according to blob setting
- * \param[in] mdivc mclk control setting.
- * \param[in] mdivr mclk divider setting.
- * \return 0 on success otherwise a negative error code.
- */
-int mn_set_mclk_blob(uint32_t mdivc, uint32_t mdivr);
-
-/**
- * \brief Release previously requested MCLK for given MCLK ID.
- * \param[in] mclk_id id of main clock.
- */
-void mn_release_mclk(uint32_t mclk_id);
-
-#if CONFIG_INTEL_MN
-/**
- * \brief Finds and sets valid combination of BCLK source and M/N to
- *	  achieve requested BCLK rate.
- *	  User should release clock when it is no longer needed to allow
- *	  driver to change M/N source when user count drops to 0.
- * \param[in] dai_index DAI index (SSP port).
- * \param[in] bclk_rate Bit clock frequency.
- * \param[out] out_scr_div SCR divisor that should be set by caller to achieve
- *			   requested BCLK rate.
- * \param[out] out_need_ecs If set to true, the caller should configure ECS.
- * \return 0 on success otherwise a negative error code.
- * \see mn_release_bclk()
- */
-int mn_set_bclk(uint32_t dai_index, uint32_t bclk_rate,
-		uint32_t *out_scr_div, bool *out_need_ecs);
-
-/**
- * \brief Release previously requested BCLK for given DAI.
- * \param[in] dai_index DAI index (SSP port).
- */
-void mn_release_bclk(uint32_t dai_index);
-
-/**
- * \brief Resets M & N values of M/N divider for given DAI index.
- * \param[in] dai_index DAI index (SSP port).
- */
-void mn_reset_bclk_divider(uint32_t dai_index);
-#endif
-
-/**
- * \brief Retrieves M/N dividers structure.
- * \return Pointer to M/N dividers structure.
- */
-static inline struct mn *mn_get(void)
-{
-	return sof_get()->mn;
-}
-
-#endif /* __SOF_DRIVERS_MN_H__ */
diff --git a/src/platform/Kconfig b/src/platform/Kconfig
index c558d371806e..684f775049aa 100644
--- a/src/platform/Kconfig
+++ b/src/platform/Kconfig
@@ -339,7 +339,6 @@ config CAVS
 	bool
 	default n
 	select INTEL
-	select INTEL_MN
 	select SOF_ZEPHYR_NO_SOF_CLOCK
 
 config CAVS_VERSION_2_5
diff --git a/west.yml b/west.yml
index abe21291c4da..f7b669fc8fff 100644
--- a/west.yml
+++ b/west.yml
@@ -43,7 +43,7 @@ manifest:
 
     - name: zephyr
       repo-path: zephyr
-      revision: cbb6199e679c50c75d3ed090852b4993e8b06a8a
+      revision: a14ae39e7447321db35d8fd84b282fef4b098c49
       remote: zephyrproject
 
       # Import some projects listed in zephyr/west.yml@revision