Date: Thu, 08 Jul 2004 15:40:21 +0200 From: Martin Nilsson <martin@gneto.com> To: Avleen Vig <lists-freebsd@silverwraith.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Adding DMA support for a device Message-ID: <40ED4EC5.8010003@gneto.com> In-Reply-To: <20040708081726.GD5238@silverwraith.com> References: <20040708081726.GD5238@silverwraith.com>
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Avleen Vig wrote:
> The drive supports DMA, and Windows sets it to use UDMA mode 5 (I
> think), but BSD does not.
>
> Can anyone point me in the right direction for this?
>
have you tried man ata ?
The following tunables are settable from the loader:
hw.ata.atapi_dma
set to 1 for DMA access, 0 for PIO (default is PIO).
/Martin
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