diff --git a/.gitmodules b/.gitmodules
index 69ce0f77be28..85cb2cc46f0a 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -4,7 +4,7 @@
     branch = 202205
 [submodule "sonic-linux-kernel"]
 	path = src/sonic-linux-kernel
-	url = https://github.com/sonic-net/sonic-linux-kernel
+	url = https://github.com/Junchao-Mellanox/sonic-linux-kernel
     branch = 202205
 [submodule "sonic-sairedis"]
 	path = src/sonic-sairedis
diff --git a/platform/mellanox/hw-management.mk b/platform/mellanox/hw-management.mk
index 6270e43a8ccb..c3dca6fe6cdf 100644
--- a/platform/mellanox/hw-management.mk
+++ b/platform/mellanox/hw-management.mk
@@ -16,7 +16,7 @@
 #
 # Mellanox HW Management
 
-MLNX_HW_MANAGEMENT_VERSION = 7.0020.4301
+MLNX_HW_MANAGEMENT_VERSION = 7.0020.4303
 
 export MLNX_HW_MANAGEMENT_VERSION
 
diff --git a/platform/mellanox/hw-management/0002-Disable-hw-mgmt-on-SimX-platforms.patch b/platform/mellanox/hw-management/0002-Disable-hw-mgmt-on-SimX-platforms.patch
index 61aab18090a2..f3a2b87cc5ab 100644
--- a/platform/mellanox/hw-management/0002-Disable-hw-mgmt-on-SimX-platforms.patch
+++ b/platform/mellanox/hw-management/0002-Disable-hw-mgmt-on-SimX-platforms.patch
@@ -1,47 +1,85 @@
-From 422b64397f2f33b394d037820f0ceb4c09e3a725 Mon Sep 17 00:00:00 2001
-From: Alexander Allen <arallen@nvidia.com>
-Date: Fri, 21 Jan 2022 16:47:19 +0000
-Subject: [PATCH 2/4] Disable hw-mgmt on SimX platforms
+From 78c36dabc04236f54c6274b2faff42c2acf56c82 Mon Sep 17 00:00:00 2001
+From: Junchao-Mellanox <junchao@nvidia.com>
+Date: Mon, 28 Aug 2023 11:46:52 +0800
+Subject: [PATCH] [PATCH 2/4] Disable hw-mgmt on SimX platforms
 
 ---
- usr/usr/bin/hw-management-ready.sh | 11 +++++++----
- usr/usr/bin/hw-management.sh       |  9 +++++++++
- 2 files changed, 16 insertions(+), 4 deletions(-)
+ usr/usr/bin/hw-management-ready.sh |  6 ++++++
+ usr/usr/bin/hw-management.sh       | 23 ++++++++++++++++-------
+ 2 files changed, 22 insertions(+), 7 deletions(-)
 
 diff --git a/usr/usr/bin/hw-management-ready.sh b/usr/usr/bin/hw-management-ready.sh
-index 88672a8..7558c68 100755
+index 2b736d2..649c125 100755
 --- a/usr/usr/bin/hw-management-ready.sh
 +++ b/usr/usr/bin/hw-management-ready.sh
-@@ -51,17 +51,20 @@ if [ -d /var/run/hw-management ]; then
- 	rm -fr /var/run/hw-management
- fi
+@@ -39,6 +39,12 @@
+ #              Waits in loop until hw-management service can be started.
+ #              Report start of hw-management service to console and logger.
  
--case $board_type in
--VMOD0014)
-+if [ -z "$(lspci -vvv | grep SimX)" ]; then
-+    case $board_type in
-+    VMOD0014)
- 	if [ ! -d /sys/devices/pci0000:00/0000:00:1f.0/NVSN2201:00/mlxreg-hotplug/hwmon ]; then
- 		timeout 180 bash -c 'until [ -d /sys/devices/pci0000:00/0000:00:1f.0/NVSN2201:00/mlxreg-hotplug/hwmon ]; do sleep 0.2; done'
- 	fi
- 	;;
--*)
-+    *)
- 	if [ ! -d /sys/devices/platform/mlxplat/mlxreg-hotplug/hwmon ]; then
- 		timeout 180 bash -c 'until [ -d /sys/devices/platform/mlxplat/mlxreg-hotplug/hwmon ]; do sleep 0.2; done'
- 	fi
- 	;;
--esac
-+    esac
++if [ -n "$(lspci -vvv | grep SimX)" ]; then
++    echo "Start Chassis HW management service."
++    logger -t hw-management -p daemon.notice "Start Chassis HW management service."
++	exit 0
 +fi
 +
- echo "Start Chassis HW management service."
- logger -t hw-management -p daemon.notice "Start Chassis HW management service."
+ board_type=`cat /sys/devices/virtual/dmi/id/board_name`
+ 
+ if systemctl is-active --quiet hw-management; then
 diff --git a/usr/usr/bin/hw-management.sh b/usr/usr/bin/hw-management.sh
-index 1ee05b5..50d922b 100755
+index 1591665..aa8a2b5 100755
 --- a/usr/usr/bin/hw-management.sh
 +++ b/usr/usr/bin/hw-management.sh
-@@ -2310,6 +2310,13 @@ do_chip_down()
+@@ -505,7 +505,7 @@ function restore_i2c_bus_frequency_default()
+ function find_regio_sysfs_path_helper()
+ {
+ 	# Find hwmon{n} sysfs path for regio device
+-	case $board_type in 
++	case $board_type in
+ 	VMOD0014)
+ 		for path in /sys/devices/pci0000:00/*/NVSN2201:*/mlxreg-io/hwmon/hwmon*; do
+ 			if [ -d "$path" ]; then
+@@ -668,10 +668,10 @@ set_jtag_gpio()
+ 	gpio_tdi=$((gpiobase+jtag_tdi))
+ 	echo $gpio_tdi > /sys/class/gpio/"$export_unexport"
+ 
+-	# In SN2201 system. 
++	# In SN2201 system.
+ 	# GPIO0 for CPU request to reset the Main Board I2C Mux.
+-	# GPIO1 for CPU control the CPU Board MUX when doing the ISP programming. 
+-	# GPIO13 for CPU request Main Board JTAG control signal. 
++	# GPIO1 for CPU control the CPU Board MUX when doing the ISP programming.
++	# GPIO13 for CPU request Main Board JTAG control signal.
+ 	if [ "$board_type" == "VMOD0014" ]; then
+ 		mux_reset=27
+ 		jtag_mux_en=33
+@@ -1209,7 +1209,7 @@ connect_msn4700_msn4600_A1()
+ 		#  msn4600C with removed A2D
+ 		connect_table+=(${msn4600C_A1_base_connect_table[@]})
+ 	else
+-		# msn4700/msn4600 respin 
++		# msn4700/msn4600 respin
+ 		connect_table+=(${msn4700_msn4600_A1_base_connect_table[@]})
+ 	fi
+ 	add_cpu_board_to_connection_table
+@@ -1985,7 +1985,7 @@ create_symbolic_links()
+ 	fi
+ 	if [ ! -d $thermal_path ]; then
+ 		mkdir $thermal_path
+-	fi	
++	fi
+ 	if [ ! -d $config_path ]; then
+ 		mkdir $config_path
+ 	fi
+@@ -2169,7 +2169,7 @@ do_start()
+ 	check_system
+ 	set_asic_pci_id
+ 
+-	asic_control=$(< $config_path/asic_control) 
++	asic_control=$(< $config_path/asic_control)
+ 	if [[ $asic_control -ne 0 ]]; then
+ 		get_asic_bus
+ 		get_asic2_bus
+@@ -2344,6 +2344,13 @@ do_chip_down()
  	/usr/bin/hw-management-thermal-events.sh change hotplug_asic down %S %p
  }
  
@@ -55,8 +93,8 @@ index 1ee05b5..50d922b 100755
  __usage="
  Usage: $(basename "$0") [Options]
  
-@@ -2335,6 +2342,8 @@ Options:
- 	force-reload	Performs hw-management 'stop' and the 'start.
+@@ -2370,6 +2377,8 @@ Options:
+ 	reset-cause	Output system reset cause.
  "
  
 +check_simx
@@ -65,5 +103,5 @@ index 1ee05b5..50d922b 100755
  	start)
  		if [ -d /var/run/hw-management ]; then
 -- 
-2.20.1
+1.9.1
 
diff --git a/platform/mellanox/hw-management/hw-mgmt b/platform/mellanox/hw-management/hw-mgmt
index c036e38b3969..d33839d0682f 160000
--- a/platform/mellanox/hw-management/hw-mgmt
+++ b/platform/mellanox/hw-management/hw-mgmt
@@ -1 +1 @@
-Subproject commit c036e38b3969e1b0eebbf36ef367bb14cd52bcfb
+Subproject commit d33839d0682faf13783de41f0591c4cde494b374
diff --git a/platform/mellanox/mlnx-platform-api/sonic_platform/chassis.py b/platform/mellanox/mlnx-platform-api/sonic_platform/chassis.py
index e13b90d6c0ca..e97b04e80ef1 100644
--- a/platform/mellanox/mlnx-platform-api/sonic_platform/chassis.py
+++ b/platform/mellanox/mlnx-platform-api/sonic_platform/chassis.py
@@ -26,6 +26,7 @@
     from sonic_platform_base.chassis_base import ChassisBase
     from sonic_py_common.logger import Logger
     import os
+    import time
     from functools import reduce
     from .utils import extract_RJ45_ports_index
     from . import utils
@@ -753,6 +754,16 @@ def _parse_warmfast_reboot_from_proc_cmdline(self):
                 return 'fast-reboot'
         return None
 
+    def _wait_reboot_cause_ready(self):
+        max_wait_time = 45
+        while max_wait_time > 0:
+            if utils.read_int_from_file('/run/hw-management/config/reset_attr_ready', log_func=None) == 1:
+                return True
+            time.sleep(5)
+            max_wait_time -= 5
+
+        return False
+
     def get_reboot_cause(self):
         """
         Retrieves the cause of the previous reboot
@@ -773,6 +784,10 @@ def get_reboot_cause(self):
             if reboot_cause:
                 return self.REBOOT_CAUSE_NON_HARDWARE, ''
 
+        if not self._wait_reboot_cause_ready():
+            logger.log_error("Hardware reboot cause is not ready")
+            return self.REBOOT_CAUSE_NON_HARDWARE, ''
+
         if not self.reboot_cause_initialized:
             self.initialize_reboot_cause()
 
diff --git a/platform/mellanox/mlnx-platform-api/tests/test_chassis.py b/platform/mellanox/mlnx-platform-api/tests/test_chassis.py
index e71f75f0a954..749f8fa7c45f 100644
--- a/platform/mellanox/mlnx-platform-api/tests/test_chassis.py
+++ b/platform/mellanox/mlnx-platform-api/tests/test_chassis.py
@@ -194,6 +194,7 @@ def mock_check_sfp_status(self, port_dict, error_dict, timeout):
         assert status is True
         assert 'sfp' in event_dict and not event_dict['sfp']
 
+    @mock.patch('sonic_platform.chassis.Chassis._wait_reboot_cause_ready', MagicMock(return_value=True))
     def test_reboot_cause(self):
         from sonic_platform import utils
         from sonic_platform.chassis import REBOOT_CAUSE_ROOT
diff --git a/src/sonic-linux-kernel b/src/sonic-linux-kernel
index 836aedf1528b..717009b40423 160000
--- a/src/sonic-linux-kernel
+++ b/src/sonic-linux-kernel
@@ -1 +1 @@
-Subproject commit 836aedf1528b427b7856b072b45b6cc7aebe9790
+Subproject commit 717009b40423dad3d40328e9d844eaaca64450ed