I have a Rock64, purchased in 2019, that has been running happily for 4 years. I was recently experimenting with hooking it up to a relay board and now I am unable to connect to the internet. I am unsure whether something is fried on the board itself or if this is a software problem I can fix, and unsure how to figure that out.
Details
I have learned more about relay boards now, so I'll do a few things differently and more carefully next attempt, but I had the 5v pin powering the relay board and the 3v pin, GPIO3_A4, and GPIO3_A5 connected to the control side to control two of the board's relays. When connected the Rock's power leds were still on, but either the OS or the internet was down, not sure which. When I then disconnected the relay board, everything worked as normal for a few iterations, but then it remained down even with the relay board disconnected. At this point I logged in over a serial console and found the OS working just fine, but no sign of the ethernet port. This is the current state and I'd like to figure out if it's a fixable one! I have ordered a wifi dongle, but I'd also like to get back ethernet if possible.
I believe the only thing I've done intentionally that may have changed the state of the filesystem was that I ran `dpkg-reconfigure network-manager`. Not sure if that changed anything.
The orange light on the ethernet port is lit constantly when the board is on. The green light is always off (now).
`lspci` produces no output.
`ip a` lists only the `lo` interface:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
`/etc/network/interfaces`:
#source /etc/network/interfaces.d/*
# Network is managed by Network manager
auto eth0
iface eth0 inet dhcp
# address 192.168.70.70
# netmask 255.255.255.0
# gateway 192.168.1.1
# dns-nameservers 8.8.8.8 8.8.4.4
USB, emmc, and sd still work
Boot output
The only thing I note here is the line `Net: No ethernet found.` and, at the bottom, several `EXT4-fs error`s. The first makes sense, that's what I'm seeing after bootup. Not sure what to do about the second, if anything.
