Re: Netra X1 with WD0 and AcerIDE

["Maurizio Caloro" <mauric%gmx.ch@localhost>]

Please if you need any test's on Netra i can do, i will help!
Mauri
-------- Original-Nachricht --------
> Datum: Tue, 26 Oct 2010 00:39:07 +0900 (JST)
> Von: Takeshi Nakayama <tn%catvmics.ne.jp@localhost>
> An: martin%duskware.de@localhost
> CC: cross+netbsd%distal.com@localhost, fair%NetBSD.org@localhost, 
> port-sparc64%NetBSD.org@localhost
> Betreff: Re: Netra X1 with WD0 and AcerIDE

> >>> Martin Husemann <martin%duskware.de@localhost> wrote
> 
> > On Mon, Oct 25, 2010 at 10:52:05AM -0400, Chris Ross wrote:
> > >   Unless you're wiling to run the disk with PIO.  Which is what I'm 
> > > doing on my X1...
> > 
> > Can we please add a check in the aceride driver for this revision, log
> > a prominent warning and go down to PIO mode automatically?
> > 
> > Martin
> 
> FreeBSD's sys/dev/ata/chipsets/ata-acerlabs.c has the following
> lines.  It seems using PIO above 137GB but DMA below.
> 
> |     /* only chips with revision > 0xc4 can do 48bit DMA */
> |     if (ctlr->chip->chiprev <= 0xc4)
> |         device_printf(dev,
> |                       "using PIO transfers above 137GB as workaround for "
> |                       "48bit DMA access bug, expect reduced performance\n");
>       :
>       :
> |     /* older chips can't do 48bit DMA transfers */
> |     if (ctlr->chip->chiprev <= 0xc4) {
> |     ch->flags |= ATA_NO_48BIT_DMA;
> |     if (ch->dma.max_iosize > 256 * 512)
> |             ch->dma.max_iosize = 256 * 512;
> |     }
> 
> -- Takeshi Nakayama

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