RGE_CPLUSCMD
RGE_SETBIT_2(sc, RGE_CPLUSCMD, RGE_CPLUSCMD_RXCSUM);
RGE_CLRBIT_2(sc, RGE_CPLUSCMD, RGE_CPLUSCMD_RXCSUM);
RGE_READ_2(sc, RGE_CPLUSCMD);