I gave up waiting for my Pomona clip to arrive, so I improvised... My soldering is absolute garbage, but it seems to be working. Do I win a prize for "jankiest flashrom setup"?pic.twitter.com/SzRqps60Zp
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It turns out that didn't fix anything, it just meant the sketchy DIMM didn't get used at all... For some reason setting CONFIG_DEBUG_RAM_SETUP "fixes" it, for now. This is going to be a fun one to debug...
Most likely some dust and/or poor contact? 
Possibly, it worked fine with the Lenovo BIOS though
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