This is the driver for the Ethernet IPs are built around a Synopsys IP Core and only tested on the STMicroelectronics platforms.
Selecting this option, rx has priority over Tx (only for Giga Ethernet device). By default, the DMA arbitration scheme is based on Round-robin (rx:tx priority is 1:1).
Some ST SoCs (for example the stx7141 and stx7200c2) have two Ethernet Controllers. This option turns on the second Ethernet device on this kind of platforms.
Use an external timer for mitigating the number of network interrupts. Currently, for SH architectures, it is possible to use the TMU channel 2 and the SH-RTC device.