Re: [PATCH] pdc20265 problem.

From: Bill Davidsen (
Date: Wed Aug 07 2002 - 18:04:24 EST

On Wed, 7 Aug 2002, Petr Vandrovec wrote:

> On 7 Aug 02 at 0:54, Adam J. Richter wrote:

> > Linux users in the "I'm not a sysadmin" crowd (?) probably
> > don't care about the scan order of the pdc20265 IDE controller,
> > but people in the "I'm a sysadmin, not a programmer" crowd
> > may have legitimiate reasons to.
> But such "I'm not a sysadmin" people will be very surprised that their
> promise was IDE2 in 2.2.x, it was IDE2 in 2.4.18, it is IDE2 in 2.5.30,
> and now - oops - it is IDE0 in 2.4.19. Broken, I'd say.

And on that one I really do agree. A change like that in 2.5 wouldn't
bother me beyond usual ten minutes of consigning whoever did it to the
darkest level of hell ;-) I would think that distributions would ship with
a kernel which follows Plauger's "law of least astonishment," so it may
not matter unless you roll your own. Kind of violates the idea of "stable"
IMHO, but I have other design decisions which bother me far more.
> There is an CONFIG_BLK_DEV_OFFBOARD option (apparently unused...),
> so use this one, if some distribution must force ide0= to promise
> if their installer cannot find master disk on /dev/hde. But changing
> behavior for no reason - especially in the middle of stable series -
> is IMHO unacceptable.

I disagree with "no reason," there was a reason, but I do think it was a
bad idea. There just aren't that many people with an onboard controller to
justify a change. My opinion, of course.
> Fortunately I use 2.5.30's IDE for real work ;-)

I use 2.5 kernels to test my backups :-( The last one I ran drooled
spillage in every attached drive, including my BSD drive which is on an
offboard controller. I would tell you the version, but it gone. Somewhere
in the 2.5.24..27 range.

bill davidsen <>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.

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