My custom board have Microblaze/uClinux system with EthernetLite core/driver.
Ethernet PHY not have MDC/MDI connection.
Have next trouble, if try ping my board before it boot finished, Ethernet will stop.
If try ping board (or RJ-45 cable connecting) after uClinux successful loaded, Ethernet fine work.
Any body can confirm like behaviour of EthernetLite core/driver ?