HP Chromebox G1 Zako - no ethernet

I have a Zako box that I installed Linux on, but I’m only seeing the wifi adapter. Nothing showing with either lspci or lsusb related to it. Is there something I should be looking into that could be causing this or should I just go for a USB ethernet adapter?

the ethernet adapter is a PCIe-attached device. Post a cbmem and dmesg log at least

Also useful info like firmware type/version, linux distro/version, etc

Using the Full ROM UEFI 2408.1 for HP Zako. Currently has Debian 12, but attempted with Arch as well.

cbmem.log

CBMEM table of contents:
    NAME                  ID        START     LENGTH  
 0. CONSOLE               434f4e53  77fde000  00020000
 1. RO MCACHE             524d5346  77fdd000  00000330
 2. TIME STAMP            54494d45  77fdc000  00000910
 3. MEM INFO              494d454d  77fdb000  00000f48
 4. AFTER CAR             c4787a93  77fce000  0000d000
 5. RAMSTAGE              9a357a9e  77e8a000  00144000
 6. SMM BACKUP            07e9acee  77e7a000  00010000
 7. SMM COMBUFFER         53534d32  77e6a000  00010000
 8. IGD OPREGION          4f444749  77e66000  00003130
 9. COREBOOT              43425442  77e5e000  00008000
10. ACPI                  41435049  77e3a000  00024000
11. TCPA TCGLOG           54445041  77e2a000  00010000
12. SMBIOS                534d4254  77e22000  00008000
13. VPD                   56504420  77ffeae0  00000105
14. FMAP                  464d4150  77ffe9a0  00000134
15. ROMSTAGE              47545352  77ffe980  00000004
16. ROMSTG STCK           90357ac4  77ffe8c0  000000a8
17. ACPI GNVS             474e5653  77ffe800  000000b0
18. TPM PPI               54505049  77ffe6a0  0000015a

dmesg.log: dmesg.log - Pastebin.com

need cbmem -1 not the table list

FWIW, I have a 2955U Zako here running 2408.1 and no issues with the built-in ethernet port - works fine here w/ChromeOS Flex and Pop_OS! 20.04

cbmem -1 log found here: cbmem.log with -1 - Pastebin.com

Yeah, I was sure it was working before, but I don’t know if something somehow changed on my hardware or if it just failed. Or if it just wasn’t and I was imagining things…

the Ethernet module isn’t being detected when the PCI bus is being scanned. I’m fairly confident this isn’t a firmware issue as I have 3 other same/similar devices here with no problem, but you can always revert to stock to check if you want

Sure thing. Appreciate the second set of eyes as well as all of the work you’ve done on these devices!