RTW_MAR0
RTW_WRITE(regs, RTW_MAR0, hashes[0]);
RTW_SYNC(regs, RTW_MAR0, RTW_RCR); /* RTW_MAR0 < RTW_MAR1 < RTW_RCR */
sc->sc_dev.dv_xname, RTW_READ(regs, RTW_MAR0),