RT2573_TXRX_CSR9
tmp = rum_read(sc, RT2573_TXRX_CSR9) & 0xff000000;
rum_write(sc, RT2573_TXRX_CSR9, tmp);
tmp = rum_read(sc, RT2573_TXRX_CSR9);
rum_write(sc, RT2573_TXRX_CSR9, tmp & ~0x00ffffff);