From mboxrd@z Thu Jan  1 00:00:00 1970
From: arnaud.patard@rtp-net.org (Arnaud Patard (Rtp))
Date: Wed, 07 Dec 2011 23:05:58 +0100
Subject: Bug#651215: Kernel fails to boot on NSLU2
In-Reply-To: <1323237747.18450.7.camel@deadeye> (Ben Hutchings's message of
 "Wed, 07 Dec 2011 06:02:27 +0000")
References: <20111206194048.12063.82586.reportbug@vrnul03074nb.vr-netze.vrnet>
 <1323237747.18450.7.camel@deadeye>
Message-ID: <8739cwxcjd.fsf@lebrac.rtp-net.org>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

Ben Hutchings <ben@decadent.org.uk> writes:
Hi,

> On Tue, 2011-12-06 at 20:40 +0100, Jochen Friedrich wrote:
>> Package: linux-image-3.1.0-1-ixp4xx
>> Severity: normal
>> 
>> While 3.0.0-6 booted OK on NSLU2 platform, 3.1.0-1 or -4 fails to do so.
>> 
>> Boot log:
> [...]
>> [    0.000000] Linux version 3.1.0-1-ixp4xx (Debian 3.1.4-1) (waldi at debian.org)
>> (gcc version 4.6.2 (Debian 4.6.2-4) ) #1 Wed Nov 30 06:35:38 UTC 2011
>> [    0.000000] CPU: XScale-IXP42x Family [690541f1] revision 1 (ARMv5TE),
>> cr=0000397f
>> [    0.000000] CPU: VIVT data cache, VIVT instruction cache
>> [    0.000000] Machine: Linksys NSLU2
> [...]
>> [    3.269860] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
>> [    3.350596] PCI: enabling device 0000:00:01.2 (0140 -> 0142)
>> [    3.356553] ehci_hcd 0000:00:01.2: EHCI Host Controller
>> [    3.452053] ehci_hcd 0000:00:01.2: new USB bus registered, assigned bus
>> number 1
>> [    3.459646] ehci_hcd 0000:00:01.2: coherent DMA mask 0x3ffffff is smaller
>> than system GFP_DMA mask 0xffffffff
>> [    3.570085] ehci_hcd 0000:00:01.2: coherent DMA mask 0x3ffffff is smaller
>> than system GFP_DMA mask 0xffffffff
>> [    3.680189] ehci_hcd 0000:00:01.2: coherent DMA mask 0x3ffffff is smaller
>> than system GFP_DMA mask 0xffffffff
>> (repeated over and over)
>
> I assume that this has something to do with:
>
> commit 650320181a08b64d4421c65c639cf47ad8cc2cd6
> Author: Nicolas Pitre <nico@fluxnic.net>
> Date:   Mon Jul 18 15:05:10 2011 -0400
>
>     ARM: change ARM_DMA_ZONE_SIZE into a variable
>
> commit 7553ee777b513c3bc8f45bb9fc75fb1bbc584ba1
> Author: Nicolas Pitre <nicolas.pitre@linaro.org>
> Date:   Tue Jul 5 22:28:09 2011 -0400
>
>     ARM: mach-ixp4xx: move from ARM_DMA_ZONE_SIZE to mdesc->dma_zone_size
>
> It's clear that the DMA zone size is supposed to be 64 MB on this
> machine and I don't see why the DMA mask hasn't propagated correctly.
> Any idea, Nicholas?

I may be wrong but it seems that arm_dma_zone_size is used before being
set. It would be interesting if someone can boot test a nslu2 kernel with
appended patch.


Thanks,
Arnaud

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