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From: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
To: John Goerzen <jgoerzen@complete.org>
Subject: Re: Promise IDE controller crashes 2.4.22
Date: Sat, 29 Nov 2003 15:23:37 +0100
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It means two things:

(a) There is a bug in drivers/ide/pci/pdc202xx_new.c:init_hwif_pdc202new(),
    hwif->autodma shouldn't be set to 0 or "idex=dma" parameter won't work.

(b) If you don't use autodma you have to tune desired mode _explicitly_ first,
    because most of ->ide_dma_check() implementations (for pdc202xx_new.c
    it is pdcnew_config_drive_xfer_rate()) check for hwif->autodma.

--bart

On Saturday 29 of November 2003 02:52, John Goerzen wrote:
> On Fri, Nov 28, 2003 at 02:00:55PM +0100, Bartlomiej Zolnierkiewicz wrote:
> > My mistake, it should have been -Xudma5 :-).
>
> I tried the ide2=dma in the kernel and then:
>
> hdparm -d 1 -u 1 -X 69 /dev/hde
>
> That did seem to solve the problem.  Output of hdparm after that
> command:
>
> pi:~# hdparm /dev/hde
>
> /dev/hde:
>  multcount    = 16 (on)
>  IO_support   =  0 (default 16-bit)
>  unmaskirq    =  0 (off)
>  using_dma    =  1 (on)
>  keepsettings =  0 (off)
>  readonly     =  0 (off)
>  readahead    =  8 (on)
>  geometry     = 19929/255/63, sectors = 320173056, start = 0
>
> What does that mean?