Board supports

HI, just trying to figure out how platform drivers works:

why in /openwrt/target/linux/ar71xx/files/arch/mips/ath79/mach-gl-ar300.c

I find:

#include <asm/mach-ath79/ar71xx_regs.h>
#include <asm/mach-ath79/ath79.h>

while in /openwrt/target/linux/*ar71xx/files/arch/mips/ath79/mach-gl-ar150.c

I find only:

#include <asm/mach-ath79/ath79.h>

Thanks

P.