Digging through the firmwares on github, this is all I could piece together. And that each later firmware version includes all previous fixes.
vl805-000138C0.bin (2023-01-11 commit to github)
- Fix for handling of split transactions
vl805-000138a1.bin (2020-01-10 commit to github)
- User settings of the ASPM (Active-state power management) bits in the PCI configuration space link control register are now maintained
- Better full-speed Isochronous endpoint support.
vl805-000137ad.bin (2020-01-10 commit to github)
- Fixes for USB webcams.
vl805-000137ab.bin (2019-10-22 commit to github)
- Better power saving.
FW013726.bin (?2019?)
- Default VisionFive 2 firmware.
vl805-00013701.bin (2019-10-22 commit to github)
- ? unknown ?