linux-kernel - Re: ohci1394 problem (MMIO broken) (was 2.6.25-rc6-git6: Reported regressions from 2.6.24)

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Message-ID: <20080326111204.GB9060@jurassic.park.msu.ru>
Date:	Wed, 26 Mar 2008 14:12:04 +0300
From:	Ivan Kokshaysky <ink@...assic.park.msu.ru>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Thomas Meyer <thomas@...3r.de>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	Adrian Bunk <bunk@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Natalie Protasevich <protasnb@...il.com>
Subject: Re: ohci1394 problem (MMIO broken) (was 2.6.25-rc6-git6: Reported
	regressions from 2.6.24)

On Tue, Mar 25, 2008 at 09:29:54PM +0100, Ingo Molnar wrote:
> OTOH, before this system worked for you before, i start to suspect that 
> ioremap is a red herring here and that it's the code that gets to that 
> physical address (which is ioremap-ed) is at fault here.
> 
> the hard hang might be your southbridge totally dumbfounded by the host 
> OS attempting to do an MMIO access to an above-4GB address?

The Intel 94x chipsets must be OK wrt >4Gb MMIO accesses, as far as I know.
You should just get all 1s on read of non-existent MMIO address, as usual.
Not a hard hang.

So I suspect something is still broken in 64-bit ioremap... It would be nice
to sort that out, even though it seems to be unrelated to this particular
problem.

Ivan.
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