I have a motherboard from unknown manufacturer based on the AMD Geode LX 800 and the CS5536 with Winbond W83627HG
We don't have your board supported. We have several similar boards with the Geode LX, cs5536, and w83627hf. digitallogic/msm800sev amd/db800 pcengines/alix1c iei/pcisa-lx-800-r10
It would probably take some work on your part and some trial and error, but it would be doable to port Coreboot to your board.
Myles