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Date: Thu, 22 Aug 2002 20:14:26 +0200
From: Tomas Szepe <szepe@pinerecords.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Martin Wilck <Martin.Wilck@Fujitsu-Siemens.com>,
       Andre Hedrick <andre@linux-ide.org>,
       Gonzalo Servat <gonzalo@unixpac.com.au>,
       Linux Kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: ServerWorks OSB4 in impossible state
Message-ID: <20020822181426.GA11539@louise.pinerecords.com>
References: <Pine.LNX.4.10.10208220143440.11626-100000@master.linux-ide.org> <1030017756.9866.74.camel@biker.pdb.fsc.net> <20020822164527.GA11488@louise.pinerecords.com> <1030039170.3151.29.camel@irongate.swansea.linux.org.uk>
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> > AFAIK 2.4.18 as well as 2.4.19-preEARLY seemed to work flawlessly w/ OSB4
> > even in DMA modes. How's the code there then? Is it dangerous to use?
> 
> Most of them work all the time (most OSB4, all CSB5. all CSB6)
> All of them work all the time with most drives
> Some of them do horrible things in UDMA with some drives (timing
> patterns I guess)
> 
> All of the OSB4 do MWDMA fine.

Oh it's not such a big problem then. If it tells you/Andre anything,
the controller I've run into trouble with seems to be (output from
2.4.19-pre2):

00:0f.1 IDE interface: Relience Computer: Unknown device 0211 (prog-if 8a [Master SecP PriP])
        Flags: bus master, medium devsel, latency 64
        I/O ports at 1880 [size=16]
00: 66 11 11 02 45 01 00 02 00 8a 01 01 00 40 80 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 81 18 00 00 00 00 00 00 00 00 00 00 00 00 00 00
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

ServerWorks OSB4: IDE controller on PCI bus 00 dev 79
ServerWorks OSB4: chipset revision 0

(This is what they put into the HP NetServer E800, which is otherwise a nice
machine -- With these we can get up to 8 NICs to work w/o IRQ sharing. Ideal
for building routers, except if we were to put SCSI drives everywhere, we'd
have nothing to eat soon enough.)

So far we've been ok as 2.4.19-pre2 indeed appears to work just fine in UDMA2.

T.
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