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SubjectRe: VIA 82C586 IDE / UDMA problems
On Thu, 15 Oct 1998, Matthias Andree wrote:

> Date: Thu, 15 Oct 1998 01:48:39 +0200
> From: Matthias Andree <mandree@sx1.HRZ.Uni-Dortmund.DE>
> To: linux-kernel@vger.rutgers.edu
> Subject: Re: VIA 82C586 IDE / UDMA problems
>
> On Tue, Oct 13, 1998 at 11:30:08PM +0200, Evgeny Zemlerub wrote:
> > After installing and configuring 2.1.125 ( skipped 123,124,125)
> > and enabeling UDMA and VIA82C586 IDE chipset support
> >
> > getteing in the boot and during work ( in varios combinations):
> >
> > hda: dma_intr: status=0x53 { DriveReady SeekComplete Index Error }
> > hda: dma_intr: error=0x84 { DriveStatusError BadCRC }
> > hda: dma_intr: status=0x51 { DriveReady SeekComplete Error }
> > hda: dma_intr: error=0x84 { DriveStatusError BadCRC }
> > hda: DMA disabled
> > hdb: DMA disabled
> > ide0: reset: success
> >
> >
> > i do have VIA82C586 IDE :
> > IDE interface: VIA Technologies VT 82C586 Apollo IDE (rev 6).
> > Medium devsel. Fast back-to-back capable. Master Capable. Latency=64.
> > I/O at 0xf000 [0xf001].
> >
> > and UDMA hard disk :
> >
> > VP_IDE: IDE controller on PCI bus 00 dev 39
> > VP_IDE: not 100% native mode: will probe irqs later
> > ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:pio, hdb:pio
> > ide0: VIA Bus-Master (U)DMA Timing Config Success
> > hda: QUANTUM FIREBALL ST6.4A, ATA DISK drive
> > ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> > hda: QUANTUM FIREBALL ST6.4A, 6149MB w/81kB Cache, CHS=784/255/63, UDMA
>
> Could this be Quantum-related instead of VIA-related?
>
> My VIA82C586 is fine with a Western Digital Caviar AC31200 (old EIDE
> 1.2 GB drive which supports PIO 3 and some slow DMA) which is not UDMA,
> however.
>
> The other reason might perhaps be too long of an IDE cable. I don't
> know the exact specification, should be something around 30 cm (12 in) for
> UDMA?
From Western Digitals Homepage:
(http://www.wdc.com/products/drives/drivers-ed/udmatp.html)
===================================================
3.The 40-pin interface cable used on Ultra DMA hard drives must be less
than 18-inches in length.
===================================================

>
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> Matthias Andree
>
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