Re: [microblaze-uclinux] Uart lite hanging

[Olof Backing <olof.backing@xxxxxxxxxxxx>]

On 27 nov 2008, at 15.22, Olof Backing wrote:

> On Thu, November 27, 2008 12:02, Giulio Mazzoleni wrote:
> > I have tried the svn version and I can confirm I'm not seeing the  
> > hangup
> > anymore.
> > In the next few days I'll conduct more tests to stress the system,  
> > but
> > for now I'm pretty happy with that.
> > Many thanks for all your support and your great job in making  
> > PetaLinux
> > always better.
>
> I don't want to destroy your new-found happiness, but maybe I should  
> be more
> specific on what we found out:
>
> * hanging when making to many calls to printf() with dynamic  
> strings, ie. %, is gone
> * hanging when receiving more than we can consume still hangs the  
> process:
> 30 bytes every 2ms at 115k2 on 50MHz -> eventually freezes the  
> process. And INTR
> aborts it.


And the solution was simplier than expected: change CONFIG_HZ to  
something bigger than 100 Hz - why not 200 or even 300 Hz! As I  
suspected this was related to a similar problem with Nios2 on a close  
project: we couldn't have the data (@31250bps) available in time for  
the application. The system was running at 100 Hz.
--
Olof Backing
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