diff --git a/target/linux/ramips/image/lzma-loader/src/board.c b/target/linux/ramips/image/lzma-loader/src/board.c
index ae9da38073..050ef695f9 100644
--- a/target/linux/ramips/image/lzma-loader/src/board.c
+++ b/target/linux/ramips/image/lzma-loader/src/board.c
@@ -11,19 +11,33 @@
  */
 
 #include <stdint.h>
+#include <stddef.h>
+
+#define KSEG0			0x80000000
+#define KSEG1			0xa0000000
+
+#define _ATYPE_ 		__PTRDIFF_TYPE__
+#define _ATYPE32_		int
+
+#define _ACAST32_		(_ATYPE_)(_ATYPE32_)
+
+#define CPHYSADDR(a)		((_ACAST32_(a)) & 0x1fffffff)
+
+#define KSEG0ADDR(a)		(CPHYSADDR(a) | KSEG0)
+#define KSEG1ADDR(a)		(CPHYSADDR(a) | KSEG1)
 
 #if defined(SOC_MT7620) || defined(SOC_RT3883)
-#define UART_BASE			0xb0000c00
+#define UART_BASE			KSEG1ADDR(0x10000c00)
 #define UART_THR			(UART_BASE + 0x04)
 #define UART_LSR			(UART_BASE + 0x1c)
 #define UART_LSR_THRE_MASK	0x40
 #elif defined(SOC_MT7621)
-#define UART_BASE			0xbe000c00
+#define UART_BASE			KSEG1ADDR(0x1e000c00)
 #define UART_THR			(UART_BASE + 0x00)
 #define UART_LSR			(UART_BASE + 0x14)
 #define UART_LSR_THRE_MASK	0x20
 #elif defined(SOC_RT305X)
-#define UART_BASE			0x10000500
+#define UART_BASE			KSEG1ADDR(0x10000500)
 #define UART_THR			(UART_BASE + 0x04)
 #define UART_LSR			(UART_BASE + 0x1c)
 #define UART_LSR_THRE_MASK	0x20