linux-kernel - Re: CPU Initiated DMA

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Message-ID: <AANLkTi=QV7wF3Z7J8eh3MkOJ1K=ZNLgHFinX8dJSuYeJ@mail.gmail.com>
Date:	Mon, 10 Jan 2011 22:21:48 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: CPU Initiated DMA

2011/1/8 Nikolaus Rath <Nikolaus@...h.org>:
Hi,

> 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?)
>
> Any pointers are greatly appreciated. I looked into "Linux Device
> Drivers", but the DMA chapter seems to be only about the device becoming
> busmaster.

Generally speaking, you can do it certainly if there is dma controller on
your system.

thanks,
-- 
Lei Ming
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