Qotom Q20331G9-S10 (Intel Denverton C3758R) — Two Issues Remaining (VGA + Console Drop)

Dear all,

I’ve been working on porting coreboot to the Qotom Q20331G9-S10, which uses
the Intel Atom C3758R (Denverton). So far:

System boots
All onboard devices are detected properly
Payload (EDK II) loads fine

Issues:

1. VGA Not Working Pre-OS
The board uses an AST2400 BMC for VGA output. I’ve added the VGA ROM
(pulled from the official site) into the coreboot image, but no output is
visible during pre-OS phase. (without the ROM, no VGA at all)

2. Console Stops After Payload
The serial console works fine during the bootblock and into romstage/post.
However, once coreboot hands off to the payload, the console garbles and
stops showing valid output.
Here’s the last clean output before it breaks:

FSP End of Firmware ...
Install PPI: BD44F629-EAE7-4198-87F1-39FAB0FD717E
NotifyPhaseApi() - End [Status: 0x00000000]
▒`▒f▒▒▒f▒▒▒▒`▒f▒▒▒f▒▒▒▒`▒f▒▒▒f▒▒

If anyone has any ideas, I’d love to hear your inputs. Happy to share build
configs or logs if that helps.

Thanks!
enzo

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