From: Marek Vasut <marex@denx.de>
To: Michal Suchanek <hramrach@gmail.com>
Subject: Re: [PATCH 00/11] Enable access to SPI NOR flash on Samsung Snow board
Date: Thu, 4 Jun 2015 17:29:35 +0200
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Cc: Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Ian Campbell <ijc+devicetree@hellion.org.uk>,
        Kumar Gala <galak@codeaurora.org>,
        Russell King <linux@arm.linux.org.uk>, Kukjin Kim <kgene@kernel.org>,
        Krzysztof Kozlowski <k.kozlowski@samsung.com>,
        Vinod Koul <vinod.koul@intel.com>,
        Dan Williams <dan.j.williams@intel.com>,
        David Woodhouse <dwmw2@infradead.org>,
        Brian Norris <computersforpeace@gmail.com>,
        Han Xu <han.xu@freescale.com>, Mark Brown <broonie@kernel.org>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        =?utf-8?q?Rafa=C5=82_Mi=C5=82ecki?= <zajec5@gmail.com>,
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        Huang Shijie <b32955@freescale.com>,
        Ben Hutchings <ben@decadent.org.uk>,
        Knut Wohlrab <knut.wohlrab@de.bosch.com>,
        "Bean Huo =?utf-8?q?=E9=9C=8D=E6=96=8C=E6=96=8C?= (beanhuo)" 
	<beanhuo@micron.com>,
        "grmoore@altera.com" <grmoore@altera.com>,
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        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
        "linux-samsung-soc" <linux-samsung-soc@vger.kernel.org>,
        dmaengine <dmaengine@vger.kernel.org>, linux-mtd@lists.infradead.org,
        "linux-spi" <linux-spi@vger.kernel.org>
References: <cover.1433364398.git.hramrach@gmail.com> <201506040053.29482.marex@denx.de> <CAOMqctRkoQrP7wAgXfWXHb2fbi2-6VayHRx5DgUKn6Djz0qtQQ@mail.gmail.com>
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On Thursday, June 04, 2015 at 06:21:32 AM, Michal Suchanek wrote:
> On 4 June 2015 at 00:53, Marek Vasut <marex@denx.de> wrote:
> > On Wednesday, June 03, 2015 at 11:26:39 PM, Michal Suchanek wrote:
> >> Hello,
> > 
> > Hi,
> > 
> >> this patch series makes it possible to access the SPI NOR flash in the
> >> Samsung XE303 'Snow' Chromebook.
> >> 
> >> Unfortunately not all issues are resolved. To work around an issue with
> >> the pl330 dma engine I respun the patch for limiting transfer size in
> >> m25p80 driver.
> > 
> > Looks like fixing a bug at the wrong place to me ...
> > 
> >> As the flash does not contain any sane filesystem and is only likely to
> >> be accessed with mtd_debug or similar tool the limit of the dma engine
> >> is easily reached. Filesystems using shorter data transfers are less
> >> likely to be affected.
> > 
> > Sounds like the DMA engine driver should be fixed.
> 
> I looked at the pl330 datasheet and don't see anything obviusly wrong
> with the pl330 driver in Linux.
> 
> Ideally it would be fixed but I have no idea what's wrong with it.

Ask maybe Catalin from ARM to help you -- he might be able to point you
to the right hardware guy.

Best regards,
Marek Vasut
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