COMC_BPS
data = COMC_BPS(sp->baudrate) & 0xff;
data = COMC_BPS(sp->baudrate) >> 8;
outb(sp->ioaddr + com_dlbl, COMC_BPS(sp->speed) & 0xff);
outb(sp->ioaddr + com_dlbh, COMC_BPS(sp->speed) >> 8);