>>> here is succesfull 2GB with rev 2B1 2GB on Pegasos 2 rev 2B1
>>> [...] it looks that it works with linux.
>>> But this is the only Pegasos 2B1 revision with 2GB I know about.

>> It's even the only pre-2B5 board with reliably working 2 GiB *I* know about ;-)

> sometimes miracle happens, Prober is lucky man.

Plot twist:
https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=13597&forum=11&start=9