diff --git a/kernel/src/arch/mipsel/board/thinpad/serial.rs b/kernel/src/arch/mipsel/board/thinpad/serial.rs
index 95c693d..7407139 100644
--- a/kernel/src/arch/mipsel/board/thinpad/serial.rs
+++ b/kernel/src/arch/mipsel/board/thinpad/serial.rs
@@ -8,8 +8,8 @@ pub struct SerialPort {
     base: usize
 }
 
-const UART_STATUS: usize = 0;
-const UART_DATA: usize = 0;
+const UART_STATUS: usize = 0x0;
+const UART_DATA: usize = 0x4;
 
 const UART_STATUS_CTS: u8 = 0x1; // clear to send signal
 const UART_STATUS_DR: u8 = 0x2; // data ready signal