AFAIK the R7800 should have ramoops enabled since 22.03 was branched of master, or perhaps a little earlier already. I have the /sys/fs/pstore filesystem mounted:
root@ap-R7800:/sys/fs/pstore# mount
/dev/root on /rom type squashfs (ro,relatime)
...
pstore on /sys/fs/pstore type pstore (rw,noatime)
But I don't see any file (yet) in that directory:
root@ap-R7800:~# ls -la /sys/fs/pstore/
drwxr-x--- 2 root root 0 Aug 25 21:12 .
drwxr-xr-x 10 root root 0 Jan 1 1970 ..
Does this mean that although the pstore filesystem is available and mounted, there is no reservation somewhere for the latest kernel memory? I'm not familiair with enabling ramoops...