CB710_MMC_IRQ_ENABLE_PORT
irqen = cb710_read_port_32(slot, CB710_MMC_IRQ_ENABLE_PORT);
enable = (cb710_read_port_16(slot, CB710_MMC_IRQ_ENABLE_PORT)
cb710_write_port_16(slot, CB710_MMC_IRQ_ENABLE_PORT, enable);