RTW_MAR1
RTW_WRITE(regs, RTW_MAR1, 0xffffffff);
RTW_READ(regs, RTW_MAR1), RTW_READ(regs, RTW_RCR));
PRINTREG32(regs, RTW_MAR1);
RTW_WRITE(regs, RTW_MAR1, ntohl(t));
RTW_WRITE(regs, RTW_MAR1, 0);