diff --git a/arch/mips/mach-xburst/include/mach/debug_ll_jz4750d.h b/arch/mips/mach-xburst/include/mach/debug_ll_jz4750d.h
index 7bf66b1..2a55dea 100644
--- a/arch/mips/mach-xburst/include/mach/debug_ll_jz4750d.h
+++ b/arch/mips/mach-xburst/include/mach/debug_ll_jz4750d.h
@@ -34,4 +34,8 @@
 
 #define DEBUG_LL_UART_SHIFT	2
 
+#define DEBUG_LL_UART_CLK	(12000000 / 16)
+#define DEBUG_LL_UART_BPS	CONFIG_BAUDRATE
+#define DEBUG_LL_UART_DIVISOR	(DEBUG_LL_UART_CLK / DEBUG_LL_UART_BPS)
+
 #endif /* __INCLUDE_DEBUG_LL_JZ4750D_H__ */