diff --git a/core/embed/trezorhal/mpu.h b/core/embed/trezorhal/mpu.h
index dfe887b147..3d72cc14b9 100644
--- a/core/embed/trezorhal/mpu.h
+++ b/core/embed/trezorhal/mpu.h
@@ -43,7 +43,6 @@ typedef enum {
   MPU_MODE_STORAGE,       // + both storage areas (privileged RW)
   MPU_MODE_ASSETS,        // + assets (privileged RW)
   MPU_MODE_SAES,          // + unprivileged SAES code
-  MPU_MODE_KERNEL_SRAM,   // + extra kernel SRAM (STM32F4 Only) (privileged RW)
   MPU_MODE_UNUSED_FLASH,  // + unused flash areas (privileged RW)
   MPU_MODE_APP,           // + unprivileged DMA2D (RW) & Assets (RO)
 } mpu_mode_t;
diff --git a/core/embed/trezorhal/stm32f4/consumption_mask.c b/core/embed/trezorhal/stm32f4/consumption_mask.c
index 085961eeb3..911502b2b8 100644
--- a/core/embed/trezorhal/stm32f4/consumption_mask.c
+++ b/core/embed/trezorhal/stm32f4/consumption_mask.c
@@ -35,13 +35,9 @@
 __attribute__((section(".buf"))) uint32_t pwm_data[SAMPLES] = {0};
 
 void consumption_mask_randomize() {
-  mpu_mode_t mpu_mode = mpu_reconfig(MPU_MODE_KERNEL_SRAM);
-
   for (int i = 0; i < SAMPLES; i++) {
     pwm_data[i] = rng_get() % TIMER_PERIOD;
   }
-
-  mpu_restore(mpu_mode);
 }
 
 void consumption_mask_init(void) {
diff --git a/core/embed/trezorhal/stm32f4/mpu.c b/core/embed/trezorhal/stm32f4/mpu.c
index 6fb954a01c..ddcd756087 100644
--- a/core/embed/trezorhal/stm32f4/mpu.c
+++ b/core/embed/trezorhal/stm32f4/mpu.c
@@ -281,13 +281,6 @@ mpu_mode_t mpu_reconfig(mpu_mode_t mode) {
       SET_REGION( 6, FLASH_BASE + 0x110000, SIZE_64KB, 0x00, FLASH_DATA, PRIV_RW );
       break;
 
-    case MPU_MODE_KERNEL_SRAM:
-      DIS_REGION( 5 );
-      // Kernel data in DMA accessible SRAM (Privileged, Read-Write, Non-Executable)
-      // (overlaps with unprivileged SRAM region)
-      SET_REGION( 6, SRAM_BASE,             SIZE_1KB,  0x00, SRAM, PRIV_RW );
-      break;
-
     case MPU_MODE_UNUSED_FLASH:
       // Unused Flash Area #1 (Privileged, Read-Write, Non-Executable)
       SET_REGION( 5, FLASH_BASE + 0x00C000, SIZE_16KB, 0x00, FLASH_DATA, PRIV_RW );