Re: 2.3 wish: integrate pcmcia into mainstream kernel

Riley Williams (rhw@MemAlpha.CX)
Thu, 3 Jun 1999 17:47:39 +0100 (GMT)


Hi Linus.

> Rogier (or somebody) mentioned that there are other cases that
> are nasty, like having a SCSI CD and ide disks.

That was me.

> I bet there are, although I've never seen those kinds of
> problems with any regular off-the-shelf kind of hardware (I
> don't actually see why that combination should be a problem,
> because I _have_ installed the other way around with the CD on
> IDE and the disks on SCSI, and the driver issue should be the
> same - at least the distributions I've tried had the ide driver
> even on the scsi kernels).

I've also done installs the other way round, and I can confirm that
with an IDE CD drive, it matters not whether the hard drives are IDE
or SCSI providing they're all the same.

However, with a SCSI CD drive, what appears to happen is as follows:

1. The BIOS sees that we're booting from the CD, so switches
the CD into floppy emulation mode, and loads the floppy
image from the CD.

2. The floppy image does whatever is required to switch the
CD out of floppy emulation mode, amongst other things.

3. The floppy image realises that to do a CD install with
this setup, it needs to load a supplementary image from
the CD.

4. Because there's at least one IDE drive, the floppy image
looks for an IDE CD drive.

5. The floppy image fails to find one, so asks the user to
insert the CD into the CD drive and press a key. When the
user presses a key, it goes back to step 4.

However, both Red Hat and Alan Cox advise me that no such problem
exists as they've done the said install type many times, but neither
will advise me as to how such is achieved!!!

Best wishes from Riley.

+----------------------------------------------------------------------+
| There is something frustrating about the quality and speed of Linux |
| development, ie., the quality is too high and the speed is too high, |
| in other words, I can implement this XXXX feature, but I bet someone |
| else has already done so and is just about to release their patch. |
+----------------------------------------------------------------------+
* ftp://ftp.MemAlpha.cx/pub/rhw/Linux
* http://www.MemAlpha.cx/kernel.versions.html

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