> Did anyone know if there a doc where noted the differences between
> different pegasos2 board revissions ?

One of the changes of 2B4 to 2B5 was the use of a different clock chip (ICS instead of Winbond), as noted by Neko.

> Wasn't there some list of what was changed/fixed for each board revission
> starting from the first ones ?

I've never seen such thing.