openwrt/target/linux/ar71xx/patches-4.4/509-MIPS-ath79-process-board-kernel-option.patch

--- a/arch/mips/ath79/setup.c
+++ b/arch/mips/ath79/setup.c
@@ -253,6 +253,8 @@ void __init plat_time_init(void)
 	mips_hpt_frequency = cpu_clk_rate / 2;
 }
 
+__setup("board=", mips_machtype_setup);
+
 static int __init ath79_setup(void)
 {
 	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);