ioreg8_write
#define LEDSTEP_P() ioreg8_write(G42XXEB_PLDREG_BASE+G42XXEB_LED, led_data++)
#define pldreg8_write(off,v) ioreg8_write(G42XXEB_PLDREG_VBASE+(off),v)
ioreg8_write(LUBBOCK_OBIO_VBASE+(offset), (value))