diff --git a/app/rev3/Makefile b/app/rev3/Makefile
index b312589a..6527ede1 100644
--- a/app/rev3/Makefile
+++ b/app/rev3/Makefile
@@ -20,10 +20,11 @@ TARGET = STM32H733VGTx
 # building variables
 ######################################
 # debug build?
-DEBUG = 1
+DEBUG ?= 1
 # optimization
 OPT = -Og
-
+# run validation?
+VALIDATION ?= 0
 
 #######################################
 # paths
@@ -51,6 +52,7 @@ $(DRIVER_DIR)/usb/USB_DEVICE/App/usbd_desc.c \
 $(DRIVER_DIR)/usb/USB_DEVICE/App/usbd_cdc_if.c \
 $(DRIVER_DIR)/usb/USB_DEVICE/Target/usbd_conf.c \
 $(DRIVER_DIR)/usb/usb.c 						\
+$(DRIVER_DIR)/flash/MX25L51245GZ2I-08G.c						\
 $(LIB_DIR)/Drivers/STM32H7xx_HAL_Driver/Src/stm32h7xx_hal_pcd.c \
 $(LIB_DIR)/Drivers/STM32H7xx_HAL_Driver/Src/stm32h7xx_hal_pcd_ex.c \
 $(LIB_DIR)/Drivers/STM32H7xx_HAL_Driver/Src/stm32h7xx_ll_usb.c \
@@ -152,6 +154,7 @@ C_INCLUDES =  \
 -I$(MOD_DIR)/error_sdr   			\
 -I$(MOD_DIR)/math_sdr   			\
 -I$(DRIVER_DIR)/led					\
+-I$(DRIVER_DIR)/flash				\
 -I$(DRIVER_DIR)/usb/USB_DEVICE/App \
 -I$(DRIVER_DIR)/usb/USB_DEVICE/Target \
 -I$(INIT_DIR)/config/Inc \
@@ -173,6 +176,11 @@ ifeq ($(DEBUG), 1)
 CFLAGS += -g -gdwarf-2
 endif
 
+ifeq ($(VALIDATION), 1)
+C_SOURCES += hardware_validation.c
+CFLAGS += -DDO_HARDWARE_VALIDATION
+endif
+
 
 # Generate dependency information
 CFLAGS += -MMD -MP -MF"$(@:%.o=%.d)"
diff --git a/app/rev3/hardware_validation.c b/app/rev3/hardware_validation.c
new file mode 100644
index 00000000..96a35a2e
--- /dev/null
+++ b/app/rev3/hardware_validation.c
@@ -0,0 +1,141 @@
+/**
+  ******************************************************************************
+  * @file           : hardware_validation.c
+  * @brief          : Routines to validate components on the FC.
+  ******************************************************************************
+  * @attention
+  *
+  * Copyright (c) 2026 Sun Devil Rocketry.
+  * All rights reserved.
+  *
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is covered under the   
+  * BSD-3-Clause.                                                          
+  *                                                                              
+  * https://opensource.org/license/bsd-3-clause
+  *
+  ******************************************************************************
+  */
+
+/* Includes ------------------------------------------------------------------*/
+#include "main.h"
+#include "usb_device.h"
+#include "led.h"
+#include "flash.h"
+#include "error_sdr.h"
+
+/* Global Variables ----------------------------------------------------------*/
+
+
+
+/* Private function prototypes -----------------------------------------------*/
+
+
+
+/* Procedures ----------------------------------------------------------------*/
+
+static void flash_validation_routine
+    (
+    void
+    )
+{
+/* Flash */
+// Begin Performance Timer
+volatile uint32_t start_time = HAL_GetTick();
+
+// Init
+HFLASH_BUFFER flash_handle;
+memset(&flash_handle, 0, sizeof(HFLASH_BUFFER));
+FLASH_STATUS flash_status = flash_init(&flash_handle);
+uint8_t flash_buf[FLASH_PAGE_SIZE];
+memset(flash_buf, 0, FLASH_PAGE_SIZE);
+flash_handle.pbuffer = flash_buf;
+
+assert_fail_fast( flash_status == FLASH_OK, ERROR_FLASH_INIT_ERROR );
+
+// Set up HW validation routine
+flash_status = flash_erase(&flash_handle);
+
+assert_fail_fast( flash_status == FLASH_OK, ERROR_FLASH_CMD_ERROR );
+
+// Run write sequence (once per page)
+flash_buf[0] = 127;
+for ( uint32_t i = 0; i < FLASH_MAX_ADDR; i+=FLASH_PAGE_SIZE ) {
+  flash_handle.address = i;
+  flash_status = flash_write(&flash_handle);
+  assert_fail_fast( flash_status == FLASH_OK, ERROR_FLASH_CMD_ERROR );
+}
+
+// Run read sequence and verify (once per page)
+memset(flash_buf, 0, FLASH_PAGE_SIZE);
+for ( uint32_t i = 0; i < FLASH_MAX_ADDR; i+=FLASH_PAGE_SIZE ) {
+  flash_handle.address = i;
+  flash_status = flash_read(&flash_handle, 2);
+  assert_fail_fast( flash_status == FLASH_OK, ERROR_FLASH_CMD_ERROR );
+  assert_fail_fast( flash_buf[0] == 127, ERROR_FLASH_CMD_ERROR );
+  assert_fail_fast( flash_buf[1] == 0xFF, ERROR_FLASH_CMD_ERROR );
+}
+
+// Test Block Erasures
+// 4K
+flash_status = flash_block_erase(0, FLASH_BLOCK_4K);
+assert_fail_fast( flash_status == FLASH_OK, ERROR_FLASH_CMD_ERROR );
+for ( uint32_t i = 0; i < 0x1000 - 1; i+=FLASH_PAGE_SIZE ) {
+    flash_handle.address = i;
+    flash_status = flash_read(&flash_handle, 2);
+    assert_fail_fast( flash_status == FLASH_OK, ERROR_FLASH_CMD_ERROR );
+    assert_fail_fast( flash_buf[0] == 0xFF, ERROR_FLASH_CMD_ERROR );
+}
+
+// 32K
+flash_status = flash_block_erase(0, FLASH_BLOCK_32K);
+assert_fail_fast( flash_status == FLASH_OK, ERROR_FLASH_CMD_ERROR );
+for (uint32_t i = 0; i < 0x8000 - 1; i+=FLASH_PAGE_SIZE ) {
+    flash_handle.address = i;
+    flash_status = flash_read(&flash_handle, 2);
+    assert_fail_fast( flash_status == FLASH_OK, ERROR_FLASH_CMD_ERROR );
+    assert_fail_fast( flash_buf[0] == 0xFF, ERROR_FLASH_CMD_ERROR );
+}
+
+// 64K
+flash_status = flash_block_erase(0, FLASH_BLOCK_64K);
+assert_fail_fast( flash_status == FLASH_OK, ERROR_FLASH_CMD_ERROR );
+for ( uint32_t i = 0; i < 0x10000 - 1; i+=FLASH_PAGE_SIZE ) {
+    flash_handle.address = i;
+    flash_status = flash_read(&flash_handle, 2);
+    assert_fail_fast( flash_status == FLASH_OK, ERROR_FLASH_CMD_ERROR );
+    assert_fail_fast( flash_buf[0] == 0xFF, ERROR_FLASH_CMD_ERROR );
+}
+
+// End Performance Timer
+volatile uint32_t tdelta = HAL_GetTick() - start_time;
+(void)tdelta; // suppress unused
+
+} /* flash_validation_routine */
+
+
+void run_hardware_validation
+    (
+    void
+    ) 
+{
+/* LED */
+led_set_color(LED_WHITE);
+HAL_Delay(1000);
+led_set_color(LED_RED);
+HAL_Delay(1000);
+led_set_color(LED_BLUE);
+HAL_Delay(1000);
+led_set_color(LED_GREEN);
+HAL_Delay(1000);
+
+/* flash */
+flash_validation_routine();
+
+led_set_color(LED_WHITE);
+//buzzer_num_beeps(/*2 beeps when buzzer is implemented to signal the end*/);
+led_set_color(LED_GREEN);
+
+
+} /* run_hardware_validation */
\ No newline at end of file
diff --git a/app/rev3/main.c b/app/rev3/main.c
index 983e9904..50068386 100644
--- a/app/rev3/main.c
+++ b/app/rev3/main.c
@@ -22,7 +22,7 @@
 
 /* Private includes ----------------------------------------------------------*/
 /* USER CODE BEGIN Includes */
-
+#include "flash.h"
 /* USER CODE END Includes */
 
 /* Private typedef -----------------------------------------------------------*/
@@ -78,7 +78,6 @@ static void MX_USART3_UART_Init(void);
 
 /* Private user code ---------------------------------------------------------*/
 /* USER CODE BEGIN 0 */
-
 /* USER CODE END 0 */
 
 /**
@@ -125,8 +124,17 @@ int main(void)
   MX_SPI4_Init();
   MX_USART3_UART_Init();
   MX_USB_DEVICE_Init();
+  
   /* USER CODE BEGIN 2 */
-
+  #ifdef DO_HARDWARE_VALIDATION
+  run_hardware_validation();
+  while (1);
+  #endif
+  
+  /* Flash */
+  HFLASH_BUFFER flash_handle;
+  memset(&flash_handle, 0, sizeof(HFLASH_BUFFER));
+  FLASH_STATUS flash_status = flash_init(&flash_handle);
   /* USER CODE END 2 */
 
   /* Infinite loop */
diff --git a/app/rev3/main.h b/app/rev3/main.h
index f9c59f73..86498f83 100644
--- a/app/rev3/main.h
+++ b/app/rev3/main.h
@@ -28,6 +28,7 @@ extern "C" {
 
 /* Includes ------------------------------------------------------------------*/
 #include "stm32h7xx_hal.h"
+#include "sdr_pin_defines_A0010.h"
 
 /* Private includes ----------------------------------------------------------*/
 /* USER CODE BEGIN Includes */
@@ -53,7 +54,12 @@ extern "C" {
 void Error_Handler(void);
 
 /* USER CODE BEGIN EFP */
-
+#ifdef DO_HARDWARE_VALIDATION
+void run_hardware_validation
+    (
+    void
+    );
+#endif
 /* USER CODE END EFP */
 
 /* Private defines -----------------------------------------------------------*/
diff --git a/driver b/driver
index b9ea32f9..5fa30566 160000
--- a/driver
+++ b/driver
@@ -1 +1 @@
-Subproject commit b9ea32f981191e7533b32ee10bb9ee5b14df6feb
+Subproject commit 5fa3056657ebad17f813df8174ab0938107601fa
diff --git a/mod b/mod
index 38035936..1e904bb2 160000
--- a/mod
+++ b/mod
@@ -1 +1 @@
-Subproject commit 38035936260eaa8a1702054d58337c43cc705798
+Subproject commit 1e904bb257750c47b09303a95f6b9ad4e6a7e5e1
diff --git a/test/app/rev2/error_int/Makefile b/test/app/rev2/error_int/Makefile
index 72dc3a99..32e33e24 100644
--- a/test/app/rev2/error_int/Makefile
+++ b/test/app/rev2/error_int/Makefile
@@ -15,7 +15,7 @@ TARGET = error_int
 ################################################################
 
 # Debug build?
-DEBUG = 1
+DEBUG ?= 0
 # Optimization
 OPT   = -Og
 
@@ -112,6 +112,13 @@ C_DEFS =         \
 -DUSE_CALLBACK_TABLE \
 -DUNIT_TEST
 
+# Add debug/release flags
+ifeq ($(DEBUG), 1); then
+	C_DEFS += -DDEBUG
+else
+	C_DEFS += -DRELBLD
+endif
+
 CFLAGS = $(C_INCLUDES) $(C_DEFS) $(OPT) -Wall -g
 
 # Disable some warnings
diff --git a/test/app/rev2/error_int/test_error_int.c b/test/app/rev2/error_int/test_error_int.c
index f34039de..09115c9b 100644
--- a/test/app/rev2/error_int/test_error_int.c
+++ b/test/app/rev2/error_int/test_error_int.c
@@ -294,6 +294,62 @@ TEST_ASSERT_FALSE( "Robustness: Test that attempting to get a message from an em
 } /* test_warning_messages */
 
 
+/*******************************************************************************
+*                                                                              *
+* PROCEDURE:                                                                   * 
+*       test_assert_constructs			                                   	   *
+*                                                                              *
+* DESCRIPTION:                                                                 * 
+*       Test the assert macros (no coverage provided).						   *
+*                                                                              *
+*******************************************************************************/
+void test_assert_constructs
+	(
+	void
+	)
+{
+/*------------------------------------------------------------------------------
+ Case 1: Assert Fail
+------------------------------------------------------------------------------*/
+default_error_handler.error_callback = TEST_CALLBACK_dflt_handler; // can't be reset
+default_handler_hit = false;
+assert_fail_fast( 1 == 0, ERROR_COMMON_CLOCK_CONFIG_ERROR );
+TEST_ASSERT_EQ_UINT( "Test whether the default handler was hit.", default_handler_hit, true );
+
+/*------------------------------------------------------------------------------
+ Case 2: Assert Pass
+------------------------------------------------------------------------------*/
+default_handler_hit = false;
+assert_fail_fast( 1 == 1, ERROR_COMMON_CLOCK_CONFIG_ERROR );
+TEST_ASSERT_EQ_UINT( "Test whether the default handler was hit.", default_handler_hit, false );
+
+/*------------------------------------------------------------------------------
+ Case 3: Debug Assert in Release Mode
+------------------------------------------------------------------------------*/
+#ifndef DEBUG
+default_handler_hit = false;
+debug_assert( 0 == 1, ERROR_COMMON_CLOCK_CONFIG_ERROR );
+TEST_ASSERT_EQ_UINT( "Test whether the default handler was hit.", default_handler_hit, false );
+#else
+
+/*------------------------------------------------------------------------------
+ Case 4: Debug Assert Fail in Debug Mode
+------------------------------------------------------------------------------*/
+default_handler_hit = false;
+debug_assert( 0 == 1, ERROR_COMMON_CLOCK_CONFIG_ERROR );
+TEST_ASSERT_EQ_UINT( "Test whether the default handler was hit.", default_handler_hit, true );
+
+/*------------------------------------------------------------------------------
+ Case 5: Debug Assert Pass in Debug Mode
+------------------------------------------------------------------------------*/
+default_handler_hit = false;
+debug_assert( 1 == 1, ERROR_COMMON_CLOCK_CONFIG_ERROR );
+TEST_ASSERT_EQ_UINT( "Test whether the default handler was hit.", default_handler_hit, false );
+#endif
+
+} /* test_assert_constructs */
+
+
 /*******************************************************************************
 *                                                                              *
 * PROCEDURE:                                                                   * 
@@ -317,7 +373,8 @@ unit_test tests[] =
 	{ "error_fail_fast: I2C (IMU and Baro) initialization callbacks.", test_i2c_init_errors },
 	{ "error_fail_fast: Test callback table miss.", test_callback_table_miss }, /* ensure you're done with the default handler! cannot reset. */
 	{ "Test log-severity messages.", test_log_messages },
-	{ "Test warning-severity messages.", test_warning_messages }
+	{ "Test warning-severity messages.", test_warning_messages },
+	{ "Test assertion macros.", test_assert_constructs }
 	};
 
 /*------------------------------------------------------------------------------