The custom interface board design we've used for 4 years (with Rev A1 6710 Rabbits) boots and connects via DHCP (or fixed IP) within seconds, using either Dynamic C 10.64, or 10.72 (with patched serial libs), as it does on the Digi RCM7600 board as well of course.
The new Rev B 6710 Rabbit also starts and connects within seconds on the same RCM6700 Interface Board, but fails to bring up the network interface at all, 90% of the time when plugged into our interface board - no Ethernet LEDs, no DHCP assigned, no ping response etc.
Given that there have been no software or other hardware changes, the only remaining difference is the Rev B of the 6710, which is not specifically documented other than the serial lib patch note.
We did numerous tests swapping hardware and looking at scope traces:
The only common factor is Rev B, which does have circuit/trace difference(s):
So, does anyone have new, reliable code fix (special settings?) or documented changes?