Re: [PATCH] parport_pc.c PnP BIOS sanity check

From: Ignacio Vazquez-Abrams (ignacio@openservices.net)
Date: Fri Sep 21 2001 - 01:11:15 EST

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On Fri, 21 Sep 2001, Thomas Hood wrote:

> I'm still wondering why this function in parport_pc.c rejects dma
> values of zero. Is DMA0 not usable by the parallel port for some
> reason? I should think that if the PnP BIOS returns a dma of zero
> then it means that the parallel port is using DMA0. Sorry if I'm
> being obtuse. // Thomas Hood

DMA0 is reserved for memory refresh. It _can't_ be used for anything else,
therefore a value of 0 is representative of no value whatsoever.

-- Ignacio Vazquez-Abrams <ignacio@openservices.net>

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