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Interestingly that kind of revealed why only one GB of RAM is working with the Pegasos 2 firmware. Seems it's upset about the memory density for some reason.

I was able to get 2GB to work by emulating a second DIMM. If I understand correctly there are some 2GB DDR DIMMs that folks have used successfully, so I don't really understand why it's not working. As far as I can tell the spd eeprom is being set correctly for the banks/density. Shared some info at https://osdn.net/projects/qmiga/ticket/48449