ATACH_DMA_BEFORE_CMD
chp->ch_flags |= ATACH_DMA_BEFORE_CMD;
if ((chp->ch_flags & ATACH_DMA_BEFORE_CMD) != 0)
if ((chp->ch_flags & ATACH_DMA_BEFORE_CMD) == 0)
cp->ata_channel.ch_flags |= ATACH_DMA_BEFORE_CMD;