com_scr
sp->ioaddr + com_scr, 1, &test);
EFI_ISA_ACPI_MEMORY_WIDTH_8_BIT, sp->ioaddr + com_scr,
outb(ioaddr + com_scr, COMC_TEST);
return (inb(ioaddr + com_scr) == COMC_TEST);
#define com_spr com_scr /* scratch pad (and index) register (R/W) */
#define REG_SPR com_scr
#define REG_SCR com_scr