linux-kernel - Re: use generic DMA mapping code in powerpc V4

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Date:   Sat, 19 Jan 2019 12:52:52 +0100
From:   Christian Zigotzky <chzigotzky@...osoft.de>
To:     Christoph Hellwig <hch@....de>
Cc:     linux-arch@...r.kernel.org,
        Darren Stevens <darren@...vens-zone.net>,
        linux-kernel@...r.kernel.org, Julian Margetson <runaway@...dw.ms>,
        linux-mm@...ck.org, iommu@...ts.linux-foundation.org,
        Paul Mackerras <paulus@...ba.org>,
        Olof Johansson <olof@...om.net>, linuxppc-dev@...ts.ozlabs.org
Subject: Re: use generic DMA mapping code in powerpc V4

Hi Christoph,

I have found a small workaround. If I add 'mem=3500M' to the boot 
arguments then it detects the SATA hard disk and boots without any problems.

X5000> setenv bootargs root=/dev/sda2 console=ttyS0,115200 mem=3500M

Cheers,
Christian


On 19 January 2019 at 12:40PM, Christian Zigotzky wrote:
> Hi Christoph,
>
> I bought a USB null modem RS-232 serial cable today so I was able to 
> get some SATA error messages.
>
> Error messages:
>
> [   13.468538] fsl-sata ffe220000.sata: Sata FSL Platform/CSB Driver init
> [   13.475106] fsl-sata ffe220000.sata: failed to start port 0 
> (errno=-12)
> [   13.481736] fsl-sata ffe221000.sata: Sata FSL Platform/CSB Driver init
> [   13.488267] fsl-sata ffe221000.sata: failed to start port 0 
> (errno=-12)
>
> ---
>
> errno=-12 = Out of memory
>
> Please find attached the complete serial log.
>
> Cheers,
> Christian
>
>
> On 18 January 2019 at 4:06PM, Christian Zigotzky wrote:
>> Hello Christoph,
>>
>> I was able to compile 257002094bc5935dd63207a380d9698ab81f0775 from 
>> your Git powerpc-dma.6-debug today.
>>
>> Unfortunately I don't see any error messages (kernel ring buffer) and 
>> I don't have a RS232 serial null modem cable to get them.
>>
>> Cheers,
>> Christian
>>
>>
>