Firewire Maintainer Is Looking For Help Testing IEEE-1394 Devices On Linux 6.12
https://www.phoronix.com/news/Firewire-Linux-6.12

Too late — most machines that I'm interested in working FW on, have lots of other issues: my PowerPC MacMini has some weird issue with memory not being freed with kernels newer than 6.1 😩
Would be great to get Firewire iSight working on that machine — but alas, it doesn't appear to be possible: there are no libraries supporting the new subsystem: http://www.appliedcarbon.org/isightlinux.html