Ethernet issue on NanoPi Neo

[John Klos <john%ziaspace.com@localhost>]

Hi,

I've been running NetBSD for a while on various NanoPi NEO devices. For a 
long time, they weren't stable - they'd lock up for no straightforward 
reason after some hours or days and I couldn't get to the ddb, even on 
serial. Nowdays, they run perfectly for months, no matter the activity.

https://dmesgd.nycbug.org/index.cgi?do=view&id=7203

However, I have one issue: a non-trivial fraction of the time, emac0 
doesn't work at boot. For warm reboots, this is close to half the time 
that nothing comes in and nothing goes out. tcpdump shows nothing, 
ifconfig down and up does nothing. Trying to generate network activity 
doesn't even get the ethernet blinky light going.

Does anyone have any thoughts on other things to try when the system is in 
this state? Or any thoughts about what might make emac0 properly 
initialize?

Thanks!
John Klos