> Just installed 3.2 on a Peg1 with a Radeon 7500. [...] Now it would not boot.

https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=9252&forum=11

That thread only mentions Radeon 7000, but this issue also applies to Radeons 7200 and 7500, i.e. everything based on R100 (yes, RV200 is not based on R200 but on R100).

> Is it due to the changes on the drviers mentioned on this topic?

This topic has no mention of changes to existing drivers, just that the new R300 drivers lack certain backwards compatibility still provided with R100/R200 drivers.