> here is succesfull 2GB with rev 2B1 2GB on Pegasos 2 rev 2B1
> [...] it looks that it works with linux.

Thanks for the link. Interesting read.

> 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 ;-)