com_dlbl
sp->ioaddr + com_dlbl, 1, &data);
EFI_ISA_ACPI_MEMORY_WIDTH_8_BIT, sp->ioaddr + com_dlbl, 1, &dlbl);
outb(sp->ioaddr + com_dlbl, COMC_BPS(sp->speed) & 0xff);
dlbl = inb(ioaddr + com_dlbl);