Messages in this thread | | | Subject | Re: My $0.02 on devd and devfs | Date | Thu, 14 Oct 1999 14:08:45 -0300 | From | Horst von Brand <> |
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orc@pell.portland.or.us (david parsons) said: > In article <linux.kernel.199910141142.IAA10452@pincoya.inf.utfsm.cl>, > Horst von Brand <vonbrand@inf.utfsm.cl> wrote: > >orc@pell.portland.or.us (david parsons) said:
> >[...]
> >> I think there may be a bit of confusion here. The PC-style ports > >> already exist, and Linux already handles them. If I build a modular > >> kernel (which I do), the current version of Linux will already do the > >> fbm needed to load the drivers and give me access. If I use a > >> devfs, current 2.3.x's will do the fbm needed to load the drivers and > >> give me access without any changes to userland. But if I use devd as > >> described in recent email on the kernel list, I either have to have > >> the device nodes already installed or I have to bloat my kernel with > >> the detection parts of the drivers or I have to build the drivers > >> into the kernel.
> >The described kernel will notify devd to create the nodes when they show > >up, i.e., on boot or when the device is plugged in.
> How? > > Until I insmod the parallel port driver, the kernel doesn't know > that there are any parallel ports around.
Because it doesn't check before.
> >Any dynamic /dev will > >have to include this exact functionality somehow,
> Perhaps it would be a good idea if you wasted the five minutes > necessary to look at Richard Gooch's code before you commented > further on it.
Look, to find out if the foo device is present, you _have_ to check somehow. No way around that. I somehow seriously doubt devfs does some mindreading trick here. -- Dr. Horst H. von Brand mailto:vonbrand@inf.utfsm.cl Departamento de Informatica Fono: +56 32 654431 Universidad Tecnica Federico Santa Maria +56 32 654239 Casilla 110-V, Valparaiso, Chile Fax: +56 32 797513
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