rum_write_multi
rum_write_multi(sc, reg, &tmp, sizeof tmp);
void rum_write_multi(struct rum_softc *, uint16_t, void *, size_t);
rum_write_multi(sc, RT2573_HW_BEACON_BASE0, (uint8_t *)&desc, 24);
rum_write_multi(sc, RT2573_HW_BEACON_BASE0 + 24, mtod(m0, uint8_t *),