BGE_MODE_CTL
mode_ctl |= CSR_READ_4(sc, BGE_MODE_CTL) &
CSR_WRITE_4(sc, BGE_MODE_CTL, mode_ctl);
BGE_CLRBIT(sc, BGE_MODE_CTL, BGE_MODECTL_STACKUP);
BGE_SETBIT(sc, BGE_MODE_CTL, BGE_MODECTL_STACKUP);
CSR_WRITE_4(sc, BGE_MODE_CTL, bge_dma_swap_options(sc));
BGE_SETBIT(sc, BGE_MODE_CTL, BGE_MODECTL_STACKUP);
BGE_SETBIT(sc, BGE_MODE_CTL, BGE_MODECTL_STACKUP);
BGE_CLRBIT(sc, BGE_MODE_CTL, BGE_MODECTL_STACKUP);