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Message-ID: <1294667085.3139.3.camel@iscandar.digidescorp.com> Date: Mon, 10 Jan 2011 07:44:45 -0600 From: "Steven J. Magnani" <steve@...idescorp.com> To: Robert Hancock <hancockrwd@...il.com> Cc: linux-kernel@...r.kernel.org Subject: Re: CPU Initiated DMA On Sat, 2011-01-08 at 12:16 -0600, Robert Hancock wrote: > On 01/07/2011 02:55 PM, Nikolaus Rath wrote: > > Hello, > > > > I want to write a driver for a rather dumb PCI card, which cannot become > > bus master itself. Is it possible to use a DMA controller on the > > mainboard to still transfer data to the card without occupying the CPU? > > > > (I believe this is the way DMA used to work on ISA cards, but do recent > > x86 systems still have a DMA controller for the CPU?) > > The legacy ISA DMA controller worked like that, but you can't use that > with PCI devices. Essentially there is no way to do this, barring > perhaps some wierd platform specific feature. I believe a DMA Engine would work here - platform-specific, yes, but I wouldn't call it "wierd" :) See Documentation/dmaengine.txt. Regards, ------------------------------------------------------------------------ Steven J. Magnani "I claim this network for MARS! www.digidescorp.com Earthling, return my space modulator!" #include <standard.disclaimer> -- 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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