diff --git a/Titanix-rootfs b/Titanix-rootfs
index a079840..a884b42 160000
--- a/Titanix-rootfs
+++ b/Titanix-rootfs
@@ -1 +1 @@
-Subproject commit a079840f8e0347f48e5e4b09a58bc821281aefa7
+Subproject commit a884b42b77b7ce2902c35c3bc9075693256c4def
diff --git a/kernel/src/fs/devfs/tty.rs b/kernel/src/fs/devfs/tty.rs
index ef0141b..5749efc 100644
--- a/kernel/src/fs/devfs/tty.rs
+++ b/kernel/src/fs/devfs/tty.rs
@@ -350,7 +350,7 @@ impl File for TtyFile {
         }
         #[cfg(all(not(feature = "submit"), feature = "board_u740"))]
         {
-            if self.buf.load(Ordering::Acquire) != 255 {
+            if self.buf.lock().top() != 255 {
                 return Ok(true);
             }
             let _sum_guard = SumGuard::new();
@@ -371,7 +371,7 @@ impl File for TtyFile {
                 }
                 return Ok(false);
             } else {
-                self.buf.store(c as u8, Ordering::Release);
+                self.buf.lock().push(c as u8);
                 return Ok(true);
             }
         }