diff --git a/target/linux/atheros/Makefile b/target/linux/atheros/Makefile
index b1a2f570ae..453f896b51 100644
--- a/target/linux/atheros/Makefile
+++ b/target/linux/atheros/Makefile
@@ -11,7 +11,7 @@ BOARD:=atheros
 BOARDNAME:=Atheros
 FEATURES:=squashfs jffs2
 
-LINUX_VERSION:=2.6.22.4
+LINUX_VERSION:=2.6.23
 
 include $(INCLUDE_DIR)/target.mk
 
diff --git a/target/linux/atheros/config-2.6.22 b/target/linux/atheros/config-2.6.23
similarity index 100%
rename from target/linux/atheros/config-2.6.22
rename to target/linux/atheros/config-2.6.23
diff --git a/target/linux/atheros/files/arch/mips/atheros/board.c b/target/linux/atheros/files/arch/mips/atheros/board.c
index 1ea66c0c19..ebb4a5afef 100644
--- a/target/linux/atheros/files/arch/mips/atheros/board.c
+++ b/target/linux/atheros/files/arch/mips/atheros/board.c
@@ -29,6 +29,8 @@
 
 char *board_config, *radio_config;
 
+extern int early_serial_setup(struct uart_port *port);
+
 static u8 *find_board_config(char *flash_limit)
 {
 	char *addr;