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Re: [MIPS] SMTC: Fix crash on bootup with idebus= command line argument.

To: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Subject: Re: [MIPS] SMTC: Fix crash on bootup with idebus= command line argument.
From: "Maciej W. Rozycki" <macro@linux-mips.org>
Date: Tue, 11 Sep 2007 15:28:04 +0100 (BST)
Cc: ralf@linux-mips.org, linux-mips@linux-mips.org
In-reply-to: <20070911.230712.39152979.anemo@mba.ocn.ne.jp>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <Pine.LNX.4.64N.0709101406091.25038@blysk.ds.pg.gda.pl> <20070911.001819.126573631.anemo@mba.ocn.ne.jp> <Pine.LNX.4.64N.0709111431240.30365@blysk.ds.pg.gda.pl> <20070911.230712.39152979.anemo@mba.ocn.ne.jp>
Sender: linux-mips-bounce@linux-mips.org
On Tue, 11 Sep 2007, Atsushi Nemoto wrote:

> >  Thanks a lot -- it makes things work for my SWARM as expected.  But 
> > doesn't it break systems where there actually is a PCI-(E)ISA bridge and a 
> > legacy IDE interface?
> 
> Yes, it would breaks such systems, but that is exactly we have been
> doing for years, isn't it?

 Not quite so.  The test for the PCI-(E)ISA bridge is there so that they 
are handled.  Now I gather the use of no_pci_devices() in 
ide_probe_legacy() effectively disables the test entirely (thus making it 
a candidate for removal).  Or am I missing something?

> And if such a platform was really exists, mach-specific ide.h could be
> used as final workaround.

 I think Malta qualifies -- it has an onboard PCI IDE interface (coupled 
in a single chip with a PCI-ISA bridge) which uses legacy I/O ports.  No 
ISA slots though, if you are looking for a diehard example. ;-)

  Maciej

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