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

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Message-ID: <20190119130222.GA24346@lst.de>
Date:   Sat, 19 Jan 2019 14:02:22 +0100
From:   Christoph Hellwig <hch@....de>
To:     Christian Zigotzky <chzigotzky@...osoft.de>
Cc:     Christoph Hellwig <hch@....de>, 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

On Sat, Jan 19, 2019 at 12:52:52PM +0100, Christian Zigotzky wrote:
> 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

Interesting.  This suggest it is related to the use of ZONE_DMA by
the FSL SOCs that your board uses.  Let me investigate this a bit more.