From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from hiscom.nl (unknown [130.78.143.1]) by dsl2.external.hp.com (Postfix) with ESMTP id C09804829 for ; Wed, 16 Apr 2003 09:05:26 -0600 (MDT) Message-Id: <03Apr16.172458cest.119069@ns.hiscom.nl> From: =?iso-8859-15?Q?=22Beerse=2C_Corn=E9=22?= To: "'M. Grabert'" , =?iso-8859-15?Q?=22Beerse=2C_Corn=E9?= =?iso-8859-15?Q?=22?= Cc: Matthew Wilcox , Gavin Hubbard , parisc-linux@lists.parisc-linux.org Subject: RE: [parisc-linux] Re: Presicionbook success Date: Wed, 16 Apr 2003 17:05:21 +0200 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C30429.99F052E0" Sender: parisc-linux-admin@lists.parisc-linux.org Errors-To: parisc-linux-admin@lists.parisc-linux.org List-Help: List-Post: List-Subscribe: , List-Id: parisc-linux developers list List-Unsubscribe: , List-Archive: This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. ------_=_NextPart_001_01C30429.99F052E0 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: quoted-printable > -----Original Message----- > From: M. Grabert [mailto:xam@cs.ucc.ie] > Sent: woensdag 16 april 2003 16:18 >=20 > On Wed, 16 Apr 2003, [iso-8859-1] "Beerse, Corn=E9" wrote: >=20 > > This gives me more and more the impression it is definitly=20 > some predecessor > > of http://www6.tomshardware.com/storage/20030130/index.html > > >>>>>>>>>>>>>>>>>. snip snip <<<<<<<<<<<<< >=20 > As stated in my earlier mails, it >=20 > - hangs (I waited for quite a while!) > - or continues (if ide=3Dnodma is used) Then I think the next happens: The ide interface-chip is somehow = detected and the system pauses while nothing can continue. I think the cpu steps aside to have some dma passing by. It either waits for some dma to = happen or for a note it can continue. Which never happen and never will happen = since the ide interface-chip does this dma to the scsi controler, not to the cpu-memory. In this special case, the cpu should not ask the chip if it does dma, = the chip sure does dma but it does it not against core memory but against = the scsi controler. This will be verry hard to detect from the cpu side. I = think the nicest implementation is to use the ide=3Dnodma, either manually or carefully if a precisionbook is detected. CBee ------_=_NextPart_001_01C30429.99F052E0 Content-Type: text/html; charset="iso-8859-15" Content-Transfer-Encoding: quoted-printable RE: [parisc-linux] Re: Presicionbook success

> -----Original Message-----
> From: M. Grabert [mailto:xam@cs.ucc.ie]
> Sent: woensdag 16 april 2003 16:18
>
> On Wed, 16 Apr 2003, [iso-8859-1] "Beerse, = Corn=E9" wrote:
>
> > This gives me more and more the impression = it is definitly
> some predecessor
> > of http://www6.tomshardware.com/storage/20030130/index.ht= ml
> >
>>>>>>>>>>>>>>>>= ;>. snip snip = <<<<<<<<<<<<<
>
> As stated in my earlier mails, it
>
> - hangs (I waited for quite a while!)
> - or continues (if ide=3Dnodma is used)

Then I think the next happens: The ide interface-chip = is somehow detected and the system pauses while nothing can continue. I = think the cpu steps aside to have some dma passing by. It either waits = for some dma to happen or for a note it can continue. Which never = happen and never will happen since the ide interface-chip does this dma = to the scsi controler, not to the cpu-memory.

In this special case, the cpu should not ask the chip = if it does dma, the chip sure does dma but it does it not against core = memory but against the scsi controler. This will be verry hard to = detect from the cpu side. I think the nicest implementation is to use = the ide=3Dnodma, either manually or carefully if a precisionbook is = detected.


CBee

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