Date: Fri, 23 May 2008 17:20:56 +0200 From: "Alexey Shuvaev" <shuvaev@physik.uni-wuerzburg.de> To: phoemix@harmless.hu Cc: freebsd-current@freebsd.org Subject: Re: ata mode at startup Message-ID: <20080523152056.GA14884@wep4017.physik.uni-wuerzburg.de> In-Reply-To: <20080523155635.054f5ec4@twoflower.in.publishing.hu> References: <20080523155635.054f5ec4@twoflower.in.publishing.hu>
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On Fri, May 23, 2008 at 03:56:35PM +0200, phoemix@harmless.hu wrote:
> Hello,
>
> As known, FreeBSD sets the highest supported ATA mode, but sometimes it's
> inproper, since the disk fails to work in this mode. This will be obsolate by
> recent SATA drives, but PATA is still in use :)
>
> I've though of the possibility of adding an "atamodetab" rc script, with which
> the administrator could specify the disk modes to set on startup.
>
> I've already got a sketch for this script that I use, but I'd like to ask, does
> it worth the effort working on it a bit more, and adding it to the core OS? I
> think this would be a quite useful feature to have.
>
Hello!
I think such a thing should be set much earlier than in rc script,
somewhere in loader.conf(5) and it is already done.
>From ata(4):
[snip]
The following tunables are settable from the loader:
hw.ata.ata_dma
set to 1 for DMA access, 0 for PIO (default is DMA).
hw.ata.atapi_dma
set to 1 for DMA access, 0 for PIO (default is DMA).
[snip]
Alexey.
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