openwrtv4/target/linux/ar71xx/patches-3.7/509-MIPS-ath79-process-board-kernel-option.patch

--- a/arch/mips/ath79/setup.c
+++ b/arch/mips/ath79/setup.c
@@ -231,6 +231,8 @@ void __init plat_time_init(void)
 	mips_hpt_frequency = clk_get_rate(clk) / 2;
 }
 
+__setup("board=", mips_machtype_setup);
+
 static int __init ath79_setup(void)
 {
 	ath79_gpio_init();