Hallo, thanks for your answer. I had the coreboot-read.bin from the coreboot source "coreboot-v2-4475", it is just renamed (coreboot.rom). I used the target for IEI_JUKI_511P board because it is near the same as I have.
Does this board have CBFS support? If it didn't, try this again with Patrick's patches. The error looks like cbfstool didn't find CBFS in your ROM image.
Thanks, Myles