Use PIO instead of MMIO

configname: CONFIG_8139TOO_PIO

Linux Kernel Configuration
└─> Device Drivers
└─> Network device support
└─> Ethernet driver support
└─> Use PIO instead of MMIO

This instructs the driver to use programmed I/O ports (PIO) instead
of PCI shared memory (MMIO). This can possibly solve some problems
in case your mainboard has memory consistency issues. If unsure,
say N.