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RE: Problem with flash driver and cache
- From: "Richard Rauch" <rrauch at itrgmbh dot de>
- To: "'Harley Carmo'" <hcarmo at msn dot com>, <ecos-discuss at ecos dot sourceware dot org>
- Date: Fri, 17 Jun 2011 11:04:24 +0200
- Subject: RE: [ECOS] Problem with flash driver and cache
- References: <COL116-W58189BF6264E70D0FE8187DF690@phx.gbl>
> -----Original Message-----
> From: ecos-discuss-owner@ecos.sourceware.org
> [mailto:ecos-discuss-owner@ecos.sourceware.org] On Behalf Of
> Harley Carmo
> Sent: Monday, June 13, 2011 10:01 PM
> To: ecos-discuss@ecos.sourceware.org
> Subject: [ECOS] Problem with flash driver and cache
>
>
> Hi all,
>
> I'm having a problem with cache handling in the flash driver
> for a ARM920T processor. I'm trying to read the flash
> contents using cyg_flash_read(), but my application hangs up
> whenever the macro HAL_FLASH_CACHES_OFF is called. However
> the problem only happens if I read the flash after the eCos
> scheduler is started. When reading the flash contents in
> cyg_user_start() I have no problem.
> I already tried disabling interrupts and reordering the macro
> (as suggested here:
> http://www.mail-archive.com/ecos-discuss@ecos.sourceware.org/m
> sg01859.html) but it didn't work for me.
> Does anybody have any ideas?
At the moment I am searching problems with cache, too.
Maybe I have an idea...
When Flushing or Invalidating Flash Content, always a complete cache line is
affected.
This causes problems, when your buffer (you wants to flush or invalidate) is
not aligned to the beginning of a cache line or at the end of the cache line
are other datas.
In that case it is possible, that other data then expected are affected,
too.
I do not know, if this could be a reason for your problem. I found this
problem regarding cache handling in a specific ethernet driver
Richard Rauch
email: rrauch@itrgmbh.de
_______________________________________________
ITR GmbH
Informationstechnologie Rauch
Schnepfenreuther Hauptstrasse 27b
D-90425 Nuernberg
_______________________________________________
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