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Hi all, after playing little bit I found correct combination that gives ability to read whole 12MB - binary is here . Couple things that people have to know (probably should be contributed to docs): 1. enable SERVICE_MODE (by shorting using jumper) - this unlocks flash descriptor 2. if you want to read in Linux (Debian in my case) pass iomem=relaxed during boot - otherwise accessing /dev/mem give operation not permitted
This mainboard is little bit weird since bios region is spread across 2 SPI chips. Layout: 00000000:00000fff fd 00600000:00bfffff bios 00005000:005fffff me 00001000:00004fff gbe
It looks like there is no way to proceed without second Pomona clip for SOIC16. Luckily SPI debug console compiled in without problems after rebasing Paul's patches. I will continue reporting my experience on gerrit  - when it will get back since it has problems now.
 https://cloud.3mdeb.com/index.php/s/DJxMQ6YFeee4J3Q  https://review.coreboot.org/c/coreboot/+/25095
Best Regards, - -- Piotr Król Embedded Systems Consultant https://3mdeb.com | @3mdeb_com