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

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Date:	Tue, 25 Mar 2008 23:02:15 +0100
From:	Thomas Meyer <thomas@...3r.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	"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)

Linus Torvalds schrieb:
> On Tue, 25 Mar 2008, Thomas Meyer wrote:
>   
>> and compare lspci -vv from 2.6.25 and 2.6.24:
>>
>> 2.6.25:
>>
>>    Region 0: [virtual] Memory at 100000000 (32-bit, non-prefetchable) [size=4K]
>>
>> 2.6.24:
>>
>>    Region 0: Memory at 8c000000 (32-bit, non-prefetchable) [size=4K]
>>     
>
> Ok, so it didn't use to be at the 4GB mark.
>
> This seems to be a PCI and resource alloc issue. It would be really 
> interesting to see where the 4GB allocation started. Ie ignore anything 
> else (warnings, driver loadings etc), and _just_ look at lspci -vv output 
> for where the memory got allocated.
>
> Did you already bisect that and I just missed it?
>   
I didn't bisect this.But  I recompiled with CONFIG_RESOURCES_64BIT 
*unset* and everything is fine now, i.e. no error occurs anymore.

lspci -vv output:
0c:03.0 FireWire (IEEE 1394): Agere Systems FW323 (rev 61) (prog-if 10 
[OHCI])
        Subsystem: Agere Systems FW323
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- 
ParErr- Stepping- SERR- FastB2B+ DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
<TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 248 (3000ns min, 6000ns max), Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 19
        Region 0: Memory at 94406000 (32-bit, non-prefetchable) [size=4K]
        Capabilities: [44] Power Management version 2
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA 
PME(D0+,D1+,D2+,D3hot+,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME+
        Kernel driver in use: ohci1394
        Kernel modules: firewire-ohci, ohci1394

This is on ingo's git tree (branch: x86-latest) (commit 
0fef904c33841be92f5ebdbdb9339dd11a133c92 - x86: ioremap of 64-bit 
resource on 32-bit kernel fix)

mfg
thomas
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