[Linux-Xtensa] SMP kernel with Xtensa ISS.

linux-xtensa at linux-xtensa.org linux-xtensa at linux-xtensa.org
Thu Apr 2 04:35:21 PDT 2009


linux-xtensa at linux-xtensa.org wrote:
> linux-xtensa at linux-xtensa.org wrote:
>> Hello,
>>
>> I have found much Linux SMP kernel porting discussion in this mailing
>> list. I would like to know is there anyone who uses the Xtensa ISS and
>> XTSC environment for the Linux SMP kernel?
>
> What is XTSC? I suppose I should know.
I just realized while driving home that your referring to the Xtensa
non-GPL compiler.
>
>>
>> More directly, I have met a problem how to make the data cache
>> coherent with the SMP architecture by using XTSC environment?
I don't see why the compiler should effect the cache coherence.
We were discussing modifying ISS to detect the data cahce having
a cache alias.


>
> I haven't tried the SMP kernel on ISS but I have make the data
> cache coherent, even with non-small caches which typically experience
> cache alias problems.
>
> The 2.6.27-smp git repo with our new external cache controller is 
> quite stable.
> Possibly a bit more stable with larger caches with the alias issue.
>
> -piet
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