On Tue, Mar 03, 2020 at 10:57:03PM -0700, Duncan Patton a Campbell wrote: > > I've had problems getting an old Brother printer to work (again) > and have managed to locate/understand? the source of the problems. > > 1. ulpt must be disabled: > # config -ef /bsd > ukc> disable ulpt > ukc> quit > > 2. modifying the kernel changes the kernel checksum so to get it to relink > sha256 -h /var/db/kernel.SHA256 /bsd > > 3. relinking the kernel _re-enables_ ulpt. > > So I'm going to have install the build system and run thru the kernel patches > after I figure out how to disable ulpt in the GENERIC.MP build. > > Does this sound like it will work?
Pratical advice: Depending your need, you could also live without kernel relinking (KARL) in order to keep ulpt(4) disabled using config(8). I would still relink after an upgrade in order to have an unique /bsd (and not the one publicly available from internet). So it would be: - after an upgrade, reboot and wait relinking to be done (a fresh /bsd will be installed) - run `config -ef /bsd' and disable ulpt in the new (and unique) kernel - do *NOT* regenerate /var/db/kernel.SHA256 (so sha256 will mismatch) - reboot again and run on the new /bsd (with ulpt disabled) System will complains that relinking failed, but your /bsd with ulpt disabled will stay. Developer advice: mpi@ already pointed the right way to deal with it: make ulpt(4) and ugen(4) to coexist. This way you could use cupsd (using ugen) with a GENERIC kernel. see https://marc.info/?l=openbsd-tech&m=151618565000531&w=2 for details Thanks. -- Sebastien Marie
