RE: [parisc-linux] Re: Presicionbook success

["\"Beerse, Corné\"" <c.beerse@torex-hiscom.nl>]

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> -----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, Corné" wrote:
> 
> > This gives me more and more the impression it is definitly 
> some predecessor
> > of http://www6.tomshardware.com/storage/20030130/index.html
> >
>>>>>>>>>>>>>>>>>. snip snip <<<<<<<<<<<<<
> 
> As stated in my earlier mails, it
> 
> - hangs (I waited for quite a while!)
> - or continues (if ide=nodma 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=nodma, either manually or
carefully if a precisionbook is detected.


CBee

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