PCEngines APUx - upgrading to latest TC release?

[sbrunthaler]

Hi,

after I learned that the bootable USB/SD image from pcengines is outdated (6.4) as well as a little inconsistent (kernel from 7), I would like to give 11.1 a try.

I have a booting USB stick wich opens the serial console and produces that:

--------------------------------------------------8<----------------------------------------------
SYSLINUX 6.03 EDD 2014-10-06 Copyright (C) 1994-2014 H. Peter Anvin et al
do_IRQ: 1.55 No irq handler for vector
do_IRQ: 2.55 No irq handler for vector
do_IRQ: 3.55 No irq handler for vector
intel_powerclamp: CPU does not support MWAIT
tmpfs: Too few inodes for current use
mount: mounting rootfs on / failed: Invalid argument
init started: BusyBox v1.31.1 (2020-03-21 16:01:05 UTC)
Booting Core 11.1
Running Linux Kernel 5.4.3-tinycore.
Checking boot options... Done.
Starting udev daemon for hotplug support... Done.
Waiting as requested... 3 sd 2:0:0:0: [sdb] No Caching mode page found
Waiting as requested... 3
Scanning hard disk partitions to create /etc/fstab
Setting Language to de Done.
Ignoring swap partition(s) seek as requested.
Loading extensions...
openssl-1.1.1 openssh libssh2 ncursesw readline bash  Done.
Restoring backup files from /mnt/sdb1/tce/mydata.tgz /
Done.
Setting hostname to box Done.

login[809]: root login on 'tty1'
--------------------------------------------------8<----------------------------------------------

That's it. On my old Sony notebook, without console=/dev/ttyS0 in the extlinux.conf,
it boots fine and "ifconfig eth0 ..." works. On the pcengines APU2 it does not even have
a LAN device file /dev/eth<x> (had an "ls /dev" in the bootlocal.sh to check this).

So I can not access it, nor by console neither by LAN/ssh.

What would be the best way to find out what is missing? Drivers, parameters or whatever?
BTW, it has 3 LAN ports, and mybe this is interesting:

 do_IRQ: 1.55 No irq handler for vector
 do_IRQ: 2.55 No irq handler for vector
 do_IRQ: 3.55 No irq handler for vector

Thanks a lot,
Stefan B.