Re: do_ri failure in cache flushing routines

[Pete Popov <ppopov@mvista.com>]

G H wrote:

> At the moment I don't have the board set up for using kgdb and it's 
> complicated by the fact that we only have one serial console port. But 
> I am looking into setting it up for kgdb now.

A single serial port will work fine.

>  
> As far as stressing the system, it doesn't have enough resources ( 
> disk space ) to be able to compile the kernel, but we did write a 
> simple program that would stress the system by spawning multiple 
> threads, each one performing floating point calculations. With this 
> test, top reported a load average of over 400 and we have 
> seen no failure so far.

You can use an NFS mounted root fs to do native builds, assuming you 
have a native toolchain. That's an excellent stress test.

Pete

>
> */Pete Popov <ppopov@mvista.com>/* wrote:
>
>     G H wrote:
>
>     > I've not had much response to this question so I would like to
>     > rephrase it :
>     >
>     > Can anyone think of any possible scenario where do_ri could
>     occur in
>     > blast_icache32() ??
>     >
>     > Is this possibly a cache synchronisation problem ??
>     >
>
>     Could be a hardware memory glitch. I would use kgdb to put a
>     breakpoint
>     there and see what the data in memory looks like when this happens --
>     look for memory corruption, etc.
>
>     Pete
>
>     > TIA
>     >
>     > >While testing out an amd au1500 based board I have been getting "
>     > do_ri " exceptions >that always occur in the cache flushing
>     routines.
>     > More often than not in >blast_icache_32().
>     >
>     > >So far this has mainly happened after running the board for
>     days on
>     > end while running >multiple telnet sessions t! o it. It has
>     sometimes (
>     > quite rarely ) happened after a few >hours to a day of multiple
>     telnet
>     > session use.
>     >
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