RE: [rtl] cacheflush and RTLinux/QNX

["Robert Warner" <warner@telgen.com>]

The shared memory interface and status indication should be defined as
volatile space.

-----Original Message-----
From: Tomasz Motylewski [mailto:motyl@stan.chemie.unibas.ch]
Sent: Tuesday, August 03, 1999 6:25 AM
To: Brendan Simon
Cc: Robert & Patricia Warner; rtl@rtlinux.cs.nmt.edu; warner@telgen.com
Subject: Re: [rtl] cacheflush and RTLinux/QNX


On Tue, 3 Aug 1999, Brendan Simon wrote:

> > Is it possible that the data that is suppose to be in the shared memory
is
> > actually in cached memory?  I know the cacheflush() command would help
me
> > in RTLinux, but what about QNX?  Any other ideas?
>
> I guess it is possible that the data is cached.  To prove this you could
use

Yes. It is possible, that "ioremap" Linux call also disables the cache for
the remapped memory.

Then there is no need for flushing.
Search the linux-kernel and RTL mailing lists.

--
Tomek


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