On Fri, 31 Dec 1999, Chuck Robey wrote:
> On Fri, 31 Dec 1999, Brian Fundakowski Feldman wrote:
>
> > The way certain devices, like cd with its monotonically increasing counter
> > where devices are probed in order and assigned device based on precedence
> > and not hardwiring/controller connection, work is consistent between
> > the kernel and MAKEDEV. If you have 2 cd devices, you have cd0 and cd1,
> > so MAKEDEV accepts "cd2" for "two cd devices". All CD devices work
> > that way. Disks don't, because there is potential for hard-wiring
> > there, and will often be gaps.
>
> Why are "certain" devices wildly different than all other ones? I've
> never encountered that kind of syntax before, and I can't see that it's
> documented anywhere at all. Certainly, MAKEDEV itself (in it's
> comments) treats cd* just like all the others, specifying that the number
> following is a unit number, and *not* a quantity. I don't know when this
> happened, but it's surely not obvious. Not one word in the handbook,
> either.
>
> In fact, according to cd(4), you *can* specify the unit number:
>
> ... Prior to FreeBSD
> 2.1, the first device found will be attached as cd0 the next, cd1, etc.
> Beginning in FreeBSD 2.1 it is possible to specify what cd unit a device
> should come on line as; refer to scsi(4) for details on kernel configura-
> tion.
>
> That makes this odd setup even odder. Can't understand why this was done.
>
FWIW, bin/13768 asks the same questions.
-----
Chris D. Faulhaber - [EMAIL PROTECTED] - [EMAIL PROTECTED]
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