[U-Boot-Users] [patch] MPC8266 March-C memory test
nyet at mrv.com
Wed May 21 01:51:43 CEST 2003
Will load/store string/multiple cause a burst if i implement a test
On Tue, May 20, 2003 at 09:55:40PM +0200, Wolfgang Denk wrote:
> In message <20030519220854.GA15969 at zumanetworks.com> you wrote:
> > Should this also be portable to the 8xx[F]ADS platforms?
> Please note that there is also extensive POST code for MPC8xx
> systems, which includes an IMHO excellent memory test.
> > I am currently debugging UPM/memory problems, and a real memory test
> > would be invaluable :)
> It won't help much. Usually memory tests test just the memory
> _contents_ using read and write accesses, while 99% of all RAM
> problems happen in burst mode, i. e. while fetching instructions or
> while doing DMA. I have yet to see a RAM test that catches this
> Best regards,
> Wolfgang Denk
> Software Engineering: Embedded and Realtime Systems, Embedded Linux
> Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de
> Do not underestimate the value of print statements for debugging.
> Don't have aesthetic convulsions when using them, either.
nliu at mrv.com
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