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Message-ID: <92a12cdb0707210322m6670acaer768d078c5e358b0c@mail.gmail.com> Date: Sat, 21 Jul 2007 11:22:53 +0100 From: "Adrian McMenamin" <adrianmcmenamin@...il.com> To: "Andrew Morton" <akpm@...ux-foundation.org> Cc: linux-kernel@...r.kernel.org, lethal@...rs.sourceforge.net Subject: Re: [PATCH] Fix DMA on Dreamcast On 20/07/07, Andrew Morton <akpm@...ux-foundation.org> wrote: > On Thu, 19 Jul 2007 20:30:34 +0100 > "Adrian McMenamin" <adrianmcmenamin@...il.com> wrote: > > > I think my first attempt to post this may have got lost in space somewhere. > > > > Signed-off by: Adrian McMenamin <adrian@...en.demon.co.uk> > > Please provide a description of what problem this change is solving, and how > it solves it. > Andrew Sorry, just noticed this. Without this patch the Dreamcast won't boot when configured with the correct DMA settings in Kbuild. You can either patch the kernel or use the wrong settings in the build. Essentially the SH DMA API code is broken in that it doesn't correctly match the DMA virtual channel to the DMAC. The patch seems to fix this, though further testing has reveled there may either be an issue with the patch or an issue with other drivers using DMA and which have worked because they inadvertently relied on the breakage in the DMA API code. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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