OK, so got boards back this week and initial checks all look good! Have reliable SPI comms with all four chips and power looks to be nice and stable (for at least low frequency operation, need to add cooling before pushing them).

Zefir, your bring up instructions were very helpful - thank you! I was having trouble getting the chip to accept a job and then I finally realized I wasn't reading your instructions properly (had skipped a section). Fixed that and the chips are hashing

But, I'm not getting the same result as you test vector at https://bitcointalk.org/index.php?topic=294235.msg4454746#msg4454746

The registers all look to be good. I can submit the first and second job. The appropriate job active bits are set and the correct job id is set. But, I only get one nonce: 47 b8 a6 62

I get this same single nonce on both jobs and the two chips I've tried. I've looked over the test vector and compared it to my code as well as capturing the SPI bus on a SPI analyzer and it all looks correct…

Might anyone have some suggestions on what I'm missing?

Thanks!