[parisc-linux] Re: Presicionbook success

Wed, 16 Apr 2003 17:05:21 +0200

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> -----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

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

<P><FONT SIZE=3D2>CBee</FONT>
</P>

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