diff --git a/examples/platform/silabs/BaseApplication.cpp b/examples/platform/silabs/BaseApplication.cpp
index 37efb09fe5c207..b7ce3e9fed8bdf 100644
--- a/examples/platform/silabs/BaseApplication.cpp
+++ b/examples/platform/silabs/BaseApplication.cpp
@@ -259,7 +259,7 @@ CHIP_ERROR BaseApplication::Init()
     ChipLogProgress(AppServer, "APP: Wait WiFi Init");
     while (!wfx_hw_ready())
     {
-        vTaskDelay(pdMS_TO_TICKS(10));
+        osDelay(pdMS_TO_TICKS(10));
     }
     ChipLogProgress(AppServer, "APP: Done WiFi Init");
     /* We will init server when we get IP */
diff --git a/examples/platform/silabs/SoftwareFaultReports.cpp b/examples/platform/silabs/SoftwareFaultReports.cpp
index 8245b1bf454307..37cbae17034f7f 100644
--- a/examples/platform/silabs/SoftwareFaultReports.cpp
+++ b/examples/platform/silabs/SoftwareFaultReports.cpp
@@ -17,10 +17,10 @@
  */
 
 #include "SoftwareFaultReports.h"
-#include "FreeRTOS.h"
 #include "silabs_utils.h"
 #include <app/clusters/software-diagnostics-server/software-diagnostics-server.h>
 #include <app/util/attribute-storage.h>
+#include <cmsis_os2.h>
 #include <lib/support/CHIPMemString.h>
 #include <lib/support/CodeUtils.h>
 #include <platform/CHIPDeviceLayer.h>
@@ -75,7 +75,7 @@ void OnSoftwareFaultEventHandler(const char * faultRecordString)
     // Allow some time for the Fault event to be sent as the next action after exiting this function
     // is typically an assert or reboot.
     // Depending on the task at fault, it is possible the event can't be transmitted.
-    vTaskDelay(pdMS_TO_TICKS(1000));
+    osDelay(pdMS_TO_TICKS(1000));
 #endif // MATTER_DM_PLUGIN_SOFTWARE_DIAGNOSTICS_SERVER
 }
 
diff --git a/src/platform/silabs/DiagnosticDataProviderImpl.cpp b/src/platform/silabs/DiagnosticDataProviderImpl.cpp
index 4be7113bb67b5b..0cb4c85d3dd10a 100644
--- a/src/platform/silabs/DiagnosticDataProviderImpl.cpp
+++ b/src/platform/silabs/DiagnosticDataProviderImpl.cpp
@@ -28,10 +28,11 @@
 #if CHIP_DEVICE_CONFIG_ENABLE_THREAD
 #include <platform/OpenThread/GenericThreadStackManagerImpl_OpenThread.h>
 #endif
-#include "FreeRTOS.h"
 #include "sl_memory_manager.h"
+#include <cmsis_os2.h>
 #include <inet/InetInterface.h>
 #include <lib/support/CHIPMemString.h>
+#include <sl_cmsis_os2_common.h>
 
 using namespace ::chip::app::Clusters::GeneralDiagnostics;
 
@@ -82,31 +83,24 @@ CHIP_ERROR DiagnosticDataProviderImpl::ResetWatermarks()
 
 CHIP_ERROR DiagnosticDataProviderImpl::GetThreadMetrics(ThreadMetrics ** threadMetricsOut)
 {
-    /* Obtain all available task information */
-    TaskStatus_t * taskStatusArray;
     ThreadMetrics * head = nullptr;
-    uint32_t arraySize, x, dummy;
 
-    arraySize = uxTaskGetNumberOfTasks();
+    uint32_t threadCount         = osThreadGetCount();
+    osThreadId_t * threadIdTable = static_cast<osThreadId_t *>(chip::Platform::MemoryCalloc(threadCount, sizeof(osThreadId_t)));
 
-    taskStatusArray = static_cast<TaskStatus_t *>(chip::Platform::MemoryCalloc(arraySize, sizeof(TaskStatus_t)));
-
-    if (taskStatusArray != NULL)
+    if (threadIdTable != nullptr)
     {
-        /* Generate raw status information about each task. */
-        arraySize = uxTaskGetSystemState(taskStatusArray, arraySize, &dummy);
-        /* For each populated position in the taskStatusArray array,
-           format the raw data as human readable ASCII data. */
-
-        for (x = 0; x < arraySize; x++)
+        osThreadEnumerate(threadIdTable, threadCount);
+        for (uint8_t tIdIndex = 0; tIdIndex < threadCount; tIdIndex++)
         {
+            osThreadId_t tId       = threadIdTable[tIdIndex];
             ThreadMetrics * thread = new ThreadMetrics();
             if (thread)
             {
-                Platform::CopyString(thread->NameBuf, taskStatusArray[x].pcTaskName);
+                thread->id = tIdIndex;
+                thread->stackFreeMinimum.Emplace(osThreadGetStackSpace(tId));
+                Platform::CopyString(thread->NameBuf, osThreadGetName(tId));
                 thread->name.Emplace(CharSpan::fromCharString(thread->NameBuf));
-                thread->id = taskStatusArray[x].xTaskNumber;
-                thread->stackFreeMinimum.Emplace(taskStatusArray[x].usStackHighWaterMark);
 
                 /* Unsupported metrics */
                 // thread->stackSize
@@ -119,7 +113,7 @@ CHIP_ERROR DiagnosticDataProviderImpl::GetThreadMetrics(ThreadMetrics ** threadM
 
         *threadMetricsOut = head;
         /* The array is no longer needed, free the memory it consumes. */
-        chip::Platform::MemoryFree(taskStatusArray);
+        chip::Platform::MemoryFree(threadIdTable);
     }
 
     return CHIP_NO_ERROR;
diff --git a/src/test_driver/efr32/src/main.cpp b/src/test_driver/efr32/src/main.cpp
index 088dc4e8703664..a2a078c4692271 100644
--- a/src/test_driver/efr32/src/main.cpp
+++ b/src/test_driver/efr32/src/main.cpp
@@ -19,10 +19,10 @@
 #include <pw_unit_test/unit_test_service.h>
 
 #include <AppConfig.h>
-#include <FreeRTOS.h>
 #include <PigweedLogger.h>
 #include <PigweedLoggerMutex.h>
 #include <ProvisionManager.h>
+#include <cmsis_os2.h>
 #include <credentials/DeviceAttestationCredsProvider.h>
 #include <cstring>
 #include <lib/support/CHIPMem.h>
@@ -34,9 +34,9 @@
 #include <platform/CHIPDeviceLayer.h>
 #include <platform/KeyValueStoreManager.h>
 #include <platform/silabs/platformAbstraction/SilabsPlatform.h>
+#include <sl_cmsis_os2_common.h>
 #include <sl_system_init.h>
 #include <sl_system_kernel.h>
-#include <task.h>
 
 using namespace chip;
 using namespace chip::DeviceLayer;
@@ -66,13 +66,17 @@ class NlTest : public pw_rpc::nanopb::NlTest::Service<NlTest>
 } // namespace chip::rpc
 
 namespace {
-
-#define TEST_TASK_STACK_SIZE 16 * 1024
-#define TEST_TASK_PRIORITY 1
-
-static TaskHandle_t sTestTaskHandle;
-StaticTask_t sTestTaskBuffer;
-StackType_t sTestTaskStack[TEST_TASK_STACK_SIZE];
+osThreadId_t sTestTaskHandle;
+osThread_t testTaskControlBlock;
+constexpr uint32_t kTestTaskStackSize = 16 * 1024;
+uint8_t testTaskStack[kTestTaskStackSize];
+constexpr osThreadAttr_t kTestTaskAttr = { .name       = "TestDriver",
+                                           .attr_bits  = osThreadDetached,
+                                           .cb_mem     = &testTaskControlBlock,
+                                           .cb_size    = osThreadCbSize,
+                                           .stack_mem  = testTaskStack,
+                                           .stack_size = kTestTaskStackSize,
+                                           .priority   = osPriorityNormal };
 
 chip::rpc::NlTest nl_test_service;
 pw::unit_test::UnitTestService unit_test_service;
@@ -105,15 +109,14 @@ int main(void)
     SetDeviceInstanceInfoProvider(&provision.GetStorage());
     SetCommissionableDataProvider(&provision.GetStorage());
 
-    SILABS_LOG("***** CHIP EFR32 device tests *****\r\n");
+    ChipLogProgress(AppServer, "***** CHIP EFR32 device tests *****\r\n");
 
     // Start RPC service which runs the tests.
-    sTestTaskHandle = xTaskCreateStatic(RunRpcService, "RPC_TEST_TASK", ArraySize(sTestTaskStack), nullptr, TEST_TASK_PRIORITY,
-                                        sTestTaskStack, &sTestTaskBuffer);
-    SILABS_LOG("Starting FreeRTOS scheduler");
+    sTestTaskHandle = osThreadNew(RunRpcService, nullptr, &kTestTaskAttr);
+    ChipLogProgress(AppServer, "Starting Kernel");
     sl_system_kernel_start();
 
     // Should never get here.
-    SILABS_LOG("vTaskStartScheduler() failed");
+    ChipLogProgress(AppServer, "sl_system_kernel_start() failed");
     return -1;
 }