This is the mail archive of the ecos-discuss@sources.redhat.com mailing list for the eCos project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

RE: Net crasch on mpc850


On Thu, 2002-08-08 at 17:14, Luoqi Chen wrote:
> > From: Daniel Lidsten [mailto:Daniel.Lidsten@combitechsystems.com]
> > Sent: Wednesday, August 07, 2002 2:50 AM
> > To: ecos-discuss@sources.redhat.com
> > Subject: [ECOS] Net crasch on mpc850
> > 
> > 
> > Hi,
> > 
> > I am having some net trouble with my mpc850. Every time i 
> > download a large amount of data (100-200kb) to the board then 
> > it crasches, sometime at the beginning of the download and 
> > sometimes later on, but always during download. It is always 
> > the same address that gets the TLB miss (0xC800 0000). My 
> > first thought was that my buffers was to small so i increased 
> > them to be 16 (instead of 4) but it didnt help. It is also 
> > very hard to see which function that causes the crasch. At 
> > crasch time LR points to a function called "copyin" that is 
> > located in "support.c". However, i cannot figure out how to 
> > see who called that function.
> > 
> > A thing worth mentioning is that i have created a section 
> > called ioRAM that is noncached and lies outside the ordinary 
> > cached RAM area. All ethernet buffers are located on this 
> > area. The reason for this is that neighter the serial port or 
> > the ethernet driver will work on a area that is cached.
> > 
> There was a bug in SCC ethernet driver that mistakenly
> invalidated data cache for the transmit buffer instead of
> flushing it: search for line
> 	HAL_DCACHE_INVALIDATE(txbd->buffer, txbd->length);
> in file devs/eth/powerpc/quicc/current/src/if_quicc.c,
> it should be replaced with
> 	HAL_DCACHE_FLUSH(txbd->buffer, txbd->length);
> I'm not sure if this has been fixed in the CVS repository
> lately.

Good catch.  I've fixed this just now.

> 
> The SMC serial driver handles the cache correctly.
> 
> -lq
> 
> -- 
> Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
> and search the list archive: http://sources.redhat.com/ml/ecos-discuss

-- 
------------------------------------------------------------
Gary Thomas                  |
eCosCentric, Ltd.            |  
+1 (970) 229-1963            |  eCos & RedBoot experts
gthomas@ecoscentric.com      |
http://www.ecoscentric.com/  |
------------------------------------------------------------


-- 
Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
and search the list archive: http://sources.redhat.com/ml/ecos-discuss


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]