linux driver polling mode not init

[Chgavilana]

Hi:
When you use liteeth without interruption pin, linux driver use platform_get_irq and if this doesn't exits, set polling mode. With last updates, liteeth set a IRQ, and then polling mode still inactive and devices can get network (board that use Ethernet interface without interruption pin). I set by code use_polling flag over linux driver and network works again.

Over linux driver you need to update the condition to set polling mode or define a register, but this need to be discussed over #60

[rdolbeau]

@enjoy-digital I re-discovered the same issue; setting polling mode in Linux solved my ethernet problem as well - I can connect via SSH, do a NFS mount and so on whereas without polling mode Linux never received any packet.