diff --git a/core/embed/lib/image_hash_conf.h b/core/embed/lib/image_hash_conf.h
index 62756e84c9..e8108070c7 100644
--- a/core/embed/lib/image_hash_conf.h
+++ b/core/embed/lib/image_hash_conf.h
@@ -7,7 +7,7 @@
 #ifdef IMAGE_HASH_SHA256
 #include "sha2.h"
 #define IMAGE_HASH_DIGEST_LENGTH SHA256_DIGEST_LENGTH
-#ifdef USE_HASH_PROCESSOR
+#if defined(USE_HASH_PROCESSOR) && defined(KERNEL_MODE)
 #include "hash_processor.h"
 #define IMAGE_HASH_CTX hash_sha256_context_t
 #define IMAGE_HASH_INIT(ctx) hash_processor_sha256_init(ctx)
diff --git a/core/embed/trezorhal/hash_processor.h b/core/embed/trezorhal/hash_processor.h
index 59b6194b45..c7a84a4e68 100644
--- a/core/embed/trezorhal/hash_processor.h
+++ b/core/embed/trezorhal/hash_processor.h
@@ -3,6 +3,8 @@
 
 #include <stdint.h>
 
+#ifdef KERNEL_MODE
+
 #define HASH_SHA256_BUFFER_SIZE 4
 
 typedef struct {
@@ -34,4 +36,6 @@ void hash_processor_sha256_update(hash_sha256_context_t *ctx,
 // Finalize the hash calculation, retrieve the digest
 void hash_processor_sha256_final(hash_sha256_context_t *ctx, uint8_t *output);
 
+#endif  // KERNEL_MODE
+
 #endif
diff --git a/core/embed/trezorhal/stm32f4/syscall_dispatch.c b/core/embed/trezorhal/stm32f4/syscall_dispatch.c
index a6fd697ec2..abd2839595 100644
--- a/core/embed/trezorhal/stm32f4/syscall_dispatch.c
+++ b/core/embed/trezorhal/stm32f4/syscall_dispatch.c
@@ -29,7 +29,6 @@
 #include "entropy.h"
 #include "fwutils.h"
 #include "haptic.h"
-#include "hash_processor.h"
 #include "irq.h"
 #include "mpu.h"
 #include "optiga.h"
@@ -130,33 +129,6 @@ __attribute((no_stack_protector)) void syscall_handler(uint32_t *args,
       reboot_and_upgrade(hash);
     } break;
 
-#ifdef STM32U5
-    case SYSCALL_SHA256_INIT: {
-      hash_sha256_context_t *ctx = (hash_sha256_context_t *)args[0];
-      hash_processor_sha256_init(ctx);
-    } break;
-
-    case SYSCALL_SHA256_UPDATE: {
-      hash_sha256_context_t *ctx = (hash_sha256_context_t *)args[0];
-      const uint8_t *data = (const uint8_t *)args[1];
-      uint32_t len = args[2];
-      hash_processor_sha256_update(ctx, data, len);
-    } break;
-
-    case SYSCALL_SHA256_FINAL: {
-      hash_sha256_context_t *ctx = (hash_sha256_context_t *)args[0];
-      uint8_t *output = (uint8_t *)args[1];
-      hash_processor_sha256_final(ctx, output);
-    } break;
-
-    case SYSCALL_SHA256_CALC: {
-      const uint8_t *data = (const uint8_t *)args[0];
-      uint32_t len = args[1];
-      uint8_t *hash = (uint8_t *)args[2];
-      hash_processor_sha256_calc(data, len, hash);
-    } break;
-#endif  // STM32U5
-
     case SYSCALL_DISPLAY_SET_BACKLIGHT: {
       int level = (int)args[0];
       args[0] = display_set_backlight(level);
diff --git a/core/embed/trezorhal/stm32f4/syscall_numbers.h b/core/embed/trezorhal/stm32f4/syscall_numbers.h
index 0e6138bc9d..17da29be1a 100644
--- a/core/embed/trezorhal/stm32f4/syscall_numbers.h
+++ b/core/embed/trezorhal/stm32f4/syscall_numbers.h
@@ -37,11 +37,6 @@ typedef enum {
   SYSCALL_REBOOT_TO_BOOTLOADER,
   SYSCALL_REBOOT_AND_UPGRADE,
 
-  SYSCALL_SHA256_INIT,
-  SYSCALL_SHA256_UPDATE,
-  SYSCALL_SHA256_FINAL,
-  SYSCALL_SHA256_CALC,
-
   SYSCALL_DISPLAY_SET_BACKLIGHT,
   SYSCALL_DISPLAY_GET_BACKLIGHT,
   SYSCALL_DISPLAY_SET_ORIENTATION,
diff --git a/core/embed/trezorhal/stm32f4/syscall_stubs.c b/core/embed/trezorhal/stm32f4/syscall_stubs.c
index 792523f6df..5c756247e4 100644
--- a/core/embed/trezorhal/stm32f4/syscall_stubs.c
+++ b/core/embed/trezorhal/stm32f4/syscall_stubs.c
@@ -98,32 +98,6 @@ void reboot_device(void) {
     ;
 }
 
-// =============================================================================
-// hash_processor.h
-// =============================================================================
-
-#include "hash_processor.h"
-
-void hash_processor_sha256_init(hash_sha256_context_t *ctx) {
-  syscall_invoke1((uint32_t)ctx, SYSCALL_SHA256_INIT);
-}
-
-// Feed the hash next chunk of data
-void hash_processor_sha256_update(hash_sha256_context_t *ctx,
-                                  const uint8_t *data, uint32_t len) {
-  syscall_invoke3((uint32_t)ctx, (uint32_t)data, len, SYSCALL_SHA256_UPDATE);
-}
-
-// Finalize the hash calculation, retrieve the digest
-void hash_processor_sha256_final(hash_sha256_context_t *ctx, uint8_t *output) {
-  syscall_invoke2((uint32_t)ctx, (uint32_t)output, SYSCALL_SHA256_FINAL);
-}
-
-void hash_processor_sha256_calc(const uint8_t *data, uint32_t len,
-                                uint8_t *hash) {
-  syscall_invoke3((uint32_t)data, len, (uint32_t)hash, SYSCALL_SHA256_CALC);
-}
-
 // =============================================================================
 // xdisplay.h
 // =============================================================================