[ECOS] idle_thread_loops with arm-eabi-gcc

[ECOS] idle_thread_loops with arm-eabi-gcc

[Heidet, Christophe]

Hello,

I have a strange problem with arm-eabi-gcc. 
I use the version from ecos website : arm-eabi-gcc V4.3.2
If I build with the -O2 optimization flag, I can't use the cpuload
package, because the "idle_thread_loops" never increase ...
If I decrease the optimization (to -O0) I have no problem and the
cpuload works very well.

Does anybody have a solution ? instead of decrease the optimization ...

Christophe


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Re: [ECOS] idle_thread_loops with arm-eabi-gcc

[Andrew Lunn]

On Wed, Aug 12, 2009 at 09:08:54AM +0200, Heidet, Christophe wrote:
> Hello,
> 
> I have a strange problem with arm-eabi-gcc. 
> I use the version from ecos website : arm-eabi-gcc V4.3.2
> If I build with the -O2 optimization flag, I can't use the cpuload
> package, because the "idle_thread_loops" never increase ...
> If I decrease the optimization (to -O0) I have no problem and the
> cpuload works very well.
> 
> Does anybody have a solution ? instead of decrease the optimization ...

Try making idle_thread_loops volatile. That might stop the compiler
from optimizing out the increment.

     Andrew

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[ECOS] Design of raw ethernet stack..

[Jim Bradleigh]

Hi,

I have the FreeBSD stack in use on port 1, I need to use port's 2 and 3 for my own custom receive/transmit purposes (i.e. raw ethernet Rx/Tx).

Is it best if I take the lwIP and strip this out and add in the functionality I require? 

I`m still learning alot about the low-level stuff in eCos but as far as I`m can I see I would need to create a new version of "__NETDEVTAB__" for my custom version of lwIP and alter the drivers to publish the 2nd and 3rd ports.

Is this the best way of accomplishing what i require?

Thanks,

Jim

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[ECOS] Re: idle_thread_loops with arm-eabi-gcc

[John Dallaway]

Hi Christophe

Andrew Lunn wrote:

> On Wed, Aug 12, 2009 at 09:08:54AM +0200, Heidet, Christophe wrote:
>> Hello,
>>
>> I have a strange problem with arm-eabi-gcc. 
>> I use the version from ecos website : arm-eabi-gcc V4.3.2
>> If I build with the -O2 optimization flag, I can't use the cpuload
>> package, because the "idle_thread_loops" never increase ...
>> If I decrease the optimization (to -O0) I have no problem and the
>> cpuload works very well.
>>
>> Does anybody have a solution ? instead of decrease the optimization ...
> 
> Try making idle_thread_loops volatile. That might stop the compiler
> from optimizing out the increment.

Did Andrew's suggestion resolve this problem?

John Dallaway

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