Re: VIA M1000 mini-itx system installation woes - WRITE_DMA error - cabling?

From: M. Warner Losh (imp_at_bsdimp.com)
Date: 04/29/05

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    Date: Fri, 29 Apr 2005 00:57:49 -0600 (MDT)
To: bms@spc.org

    In message: <20050427104015.GB5585@empiric.icir.org>
                Bruce M Simpson <bms@spc.org> writes:
    : On Wed, Apr 27, 2005 at 10:11:16AM +0200, Arjan Van Leeuwen wrote:
    : > After you've installed the system, insert that line into
    : > /boot/loader.conf, and load up "atacontrol mode 0 udma33 udma33" as
    : > early as possible during the boot (try using /etc/rc.early, for
    : > example) to get it up to speed again.
    :
    : Some drives have firmware tweaks downloadable from the manufacturer which
    : can be used to force the drive to never negotiate a faster data rate than
    : UDMA33 (or whatever the cable you are using is capable of). I'm thinking
    : of Samsung in particular here.
    :
    : However, I agree, this is *annoying*; I don't know of 80 + 4 conductor cables
    : for 2.5" ATA drives. If anyone knows of such things then please do let me
    : know, as I've had significant problems with a development system at work which
    : is Mini-ITX form factor based with a 2.5" drive.

    FWIW, my laptop successfully copes:

    ad0: 57231MB <TOSHIBA MK6022GAX HB002A> at ata0-master UDMA100

    that's a 2.5" drive. I believe that a standard 40 -> 44 connector
    connected on an 80 pin cable would do the trick. I know I've had some
    success with that here at work.

    Warner
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