> Circles .
> https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=6465&forum=11

Exactly. The link to the proper comment (i.e. discussing FPU incompatibility and scrapping P1022 idea subsequently) by feanor is to be found therein:

https://morph.zone/modules/newbb_plus/viewtopic.php?forum=11&topic_id=11137&start=187

Btw, an even older attempt at using e500v2 for OS4:

https://morph.zone/modules/newbb_plus/viewtopic.php?forum=11&topic_id=8473&start=43 (2nd half of posting)