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
In linux kernel since version 2.6.12  
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.