diff --git a/src/flash/nand/tcl.c b/src/flash/nand/tcl.c
index 29d4e1e1d..638937790 100644
--- a/src/flash/nand/tcl.c
+++ b/src/flash/nand/tcl.c
@@ -581,7 +581,6 @@ static COMMAND_HELPER(create_nand_device, const char *bank_name,
 	retval = CALL_COMMAND_HANDLER(controller->nand_device_command, c);
 	if (ERROR_OK != retval)
 	{
-		assert(controller->usage != NULL);
 		LOG_ERROR("'%s' driver rejected nand flash. Usage: %s",
 			controller->name,
 			controller->usage);
@@ -589,6 +588,9 @@ static COMMAND_HELPER(create_nand_device, const char *bank_name,
 		return retval;
 	}
 
+	if (controller->usage == NULL)
+		LOG_DEBUG("'%s' driver usage field missing", controller->name);
+
 	nand_device_add(c);
 
 	return ERROR_OK;
diff --git a/src/flash/nor/tcl.c b/src/flash/nor/tcl.c
index 4ba5f47ca..735caa8ec 100644
--- a/src/flash/nor/tcl.c
+++ b/src/flash/nor/tcl.c
@@ -834,12 +834,15 @@ COMMAND_HANDLER(handle_flash_bank_command)
 	retval = CALL_COMMAND_HANDLER(driver->flash_bank_command, c);
 	if (ERROR_OK != retval)
 	{
-		LOG_ERROR("'%s' driver rejected flash bank at 0x%8.8" PRIx32,
-				driver_name, c->base);
+		LOG_ERROR("'%s' driver rejected flash bank at 0x%8.8" PRIx32 "Usage %s",
+				driver_name, c->base, driver->usage);
 		free(c);
 		return retval;
 	}
 
+	if (driver->usage == NULL)
+		LOG_DEBUG("'%s' driver usage field missing", driver_name);
+
 	flash_bank_add(c);
 
 	return ERROR_OK;