Some ISA devices have been removed from DragonFly. That probably affects approximately 0% of everyone, cause they’re old devices, but a few of them are were in the GENERIC kernel configs, so you’ll get an error for an unrecognized option when you next rebuild your kernel using a GENERIC-based config, based on an older version of GENERIC. The description of which drivers went is quite sensibly placed in UPDATING.
A running description of activity related to DragonFly BSD.
May i ask why are they still in GENERIC then?
Would a note to add them back if some obscure person running a 486 wanted them over breakage not be preferred?
I edited for clarity; they aren’t in GENERIC any longer, but if you are using a GENERIC-derived config from an earlier release, you possibly still have them.