Re: dac960 devices on boot-floppies

[Joey Hess <joeyh@debian.org>]

Adam Di Carlo wrote:
> > though I have to admit I don't know the details of dac960 device files.
> 
> Yikes.  We now have 254 devices under /dev/rd.  Full list below.  Any
> way we can trim this down?

Note that the dac960 has reserved for its use all block devices with major
numbers between 48 and 55. That's a lot of devices! Specifically, the
dac960's make_rd script is (be afraid..):

#! /bin/csh -f

rm -rf /dev/rd
mkdir /dev/rd
chown root.root /dev/rd
chmod 755 /dev/rd
@ major = 48
foreach controller (0 1 2 3 4 5 6 7)
  @ minor = 0
  foreach logical_disk (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 \
			16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31)
    foreach partition (0 1 2 3 4 5 6 7)
      if ($partition == 0) then
	mknod /dev/rd/c${controller}d${logical_disk} b $major $minor
	chown root.root /dev/rd/c${controller}d${logical_disk}
	chmod 600 /dev/rd/c${controller}d${logical_disk}
      else
	mknod /dev/rd/c${controller}d${logical_disk}p${partition} b $major $minor
	chown root.root /dev/rd/c${controller}d${logical_disk}p${partition}
	chmod 600 /dev/rd/c${controller}d${logical_disk}p${partition}
      endif
      @ minor ++
    end
  end
  @ major ++
end

I think that comes to 2048 devices that the dec960 driver can potentially use.

For more info on the Dac960, see http://www.dandelion.com/Linux/DAC960.html

I think the only possible way we could support the dac960 is to have a
program that made one of these devides at a time, and probed them to see if
they have a partition on them, and if not, deleted them. Or something along
those lines. We need some kind of dynamic device file creation to make this
work.

-- 
see shy jo