diff --git a/src/device/flash.c b/src/device/flash.c
index 9729bf1dd..c988ed9be 100644
--- a/src/device/flash.c
+++ b/src/device/flash.c
@@ -38,8 +38,8 @@ void load_flash_contents(const char *flash_img) {
   }
 
   if (!flash_img || !(fp = fopen(flash_img, "r"))) {
-    Log("Can not find flash image: %s", flash_img);
-    Log("Use built-in image instead");
+    // Log("Can not find flash image: %s", flash_img);
+    // Log("Use built-in image instead");
     uint32_t *p = (uint32_t *)flash_base;
     sscanf(CONFIG_FLASH_PRESET_CONTENT, "%x,%x,%x", p, p + 1, p + 2);
   } else {
diff --git a/src/device/io/mmio.c b/src/device/io/mmio.c
index 42a622c05..26444279e 100644
--- a/src/device/io/mmio.c
+++ b/src/device/io/mmio.c
@@ -35,9 +35,9 @@ void add_mmio_map(const char *name, paddr_t addr, void *space, uint32_t len, io_
   assert(nr_map < NR_MAP);
   maps[nr_map] = (IOMap){ .name = name, .low = addr, .high = addr + len - 1,
     .space = space, .callback = callback };
-  Log("Add mmio map '%s' at [" FMT_PADDR ", " FMT_PADDR "]",
-      maps[nr_map].name, maps[nr_map].low, maps[nr_map].high);
-  fflush(stdout);
+  // Log("Add mmio map '%s' at [" FMT_PADDR ", " FMT_PADDR "]",
+  //     maps[nr_map].name, maps[nr_map].low, maps[nr_map].high);
+  // fflush(stdout);
 
   nr_map ++;
 }