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Message-ID: <7e5f60720707210713o4ff0825eu463abee77dc1f04c@mail.gmail.com> Date: Sat, 21 Jul 2007 16:13:19 +0200 From: "Peter Bortas" <bortas@...il.com> To: "Adrian McMenamin" <adrianmcmenamin@...il.com> Cc: "Andrew Morton" <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, lethal@...rs.sourceforge.net, marcus@...pp.se Subject: Re: [PATCH] Fix DMA on Dreamcast On 7/21/07, Adrian McMenamin <adrianmcmenamin@...il.com> wrote: > On 21/07/07, Peter Bortas <bortas@...il.com> wrote: > > > > > Sidenote: Does Linux handle the Dreamcast DMA errata? > > > > You need to explain what you mean (at least to me!). > > If you mean will it degrade gracefully - not without this patch if set > to the (correct) defconfig. With iffy settings it will. If I remember correctly (and that's a big if since I last looked at it in 2001) some revisions of the Dreamcast hardware would sporadically lock up if you scheduled a new DMA request to quickly after a previous one, even if you checked the ready bit. It's worked around by a delay of X microseconds as recommended by Sega engineers. I don't remember the value of X, nor where exactly in the flow this workaround should be applied. Adding Marcus in case he has a better memory than me. -- Peter Bortas - 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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