diff --git a/extmod/modtrezordebug/modtrezordebug.c b/extmod/modtrezordebug/modtrezordebug.c
index b492d3a985..b0de3d8779 100644
--- a/extmod/modtrezordebug/modtrezordebug.c
+++ b/extmod/modtrezordebug/modtrezordebug.c
@@ -27,7 +27,7 @@ STATIC mp_obj_t mod_TrezorDebug_Debug_make_new(const mp_obj_type_t *type, size_t
     return MP_OBJ_FROM_PTR(o);
 }
 
-/// def trezor.utils.memaccess(address: int, length: int) -> bytes
+/// def trezor.debug.memaccess(address: int, length: int) -> bytes
 ///     '''
 ///     Creates a bytes object that can be used to access certain memory location.
 ///     '''
diff --git a/src/trezor/debug.py b/src/trezor/debug.py
index 783e321047..2217e614f2 100644
--- a/src/trezor/debug.py
+++ b/src/trezor/debug.py
@@ -5,5 +5,15 @@ from TrezorDebug import Debug
 
 _utils = Debug()
 
+MEM_FLASH_BASE = const(0x08000000)
+MEM_FLASH_SIZE = const(1024 * 1024)
+MEM_FLASH_END = const(MEM_FLASH_BASE + MEM_FLASH_SIZE - 1)
+MEM_CCM_BASE = const(0x10000000)
+MEM_CCM_SIZE = const(64 * 1024)
+MEM_CCM_END = const(MEM_CCM_BASE + MEM_CCM_SIZE - 1)
+MEM_SRAM_BASE = const(0x20000000)
+MEM_SRAM_SIZE = const(128 * 1024)
+MEM_SRAM_END = const(MEM_SRAM_BASE + MEM_SRAM_SIZE - 1)
+
 def memaccess(address, length):
     return _utils.memaccess(address, length)