RT2573_TXRX_CSR4
uerror = rum_setbits(sc, RT2573_TXRX_CSR4, RT2573_ACKCTS_PWRMGT);
rum_setbits(sc, RT2573_TXRX_CSR4,
rum_modbits(sc, RT2573_TXRX_CSR4,
rum_setbits(sc, RT2573_TXRX_CSR4, RT2573_SHORT_PREAMBLE);
rum_clrbits(sc, RT2573_TXRX_CSR4, RT2573_SHORT_PREAMBLE);
rum_modbits(sc, RT2573_TXRX_CSR4, RT2573_SHORT_RETRY(rvp->maxretry) |
rum_clrbits(sc, RT2573_TXRX_CSR4, RT2573_ACKCTS_PWRMGT);