[ECOS] at91sam7x256 tm_basic problem

[ECOS] at91sam7x256 tm_basic problem

[Alexander Neundorf]

Hi,

I'm trying to run the tm_basic test on the at91sam7x256 (64kB RAM) but this doesn't seem to work out of the box.
tm_basic.cxx has this code:

#define STACK_SIZE (CYGNUM_HAL_STACK_SIZE_TYPICAL+4*1024)
#define CYG_THREAD_OVERHEAD (STACK_SIZE+ <some more...>)

#define NTEST_THREADS        ((CYGMEM_REGION_ram_SIZE/16)/CYG_THREAD_OVERHEAD)

which is here:
64kb/16 / ( <something> + 4kb), i.e. 4 kb/(x+4 kb), which is always zero.
I could start hacking around that, but before that I'd like to ask what the recommended way to run tm_basic on the at91sam7 is ?

Thanks
Alex




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Re: [ECOS] at91sam7x256 tm_basic problem

[Andrew Lunn]

On Thu, Mar 20, 2008 at 10:49:25AM +0100, Alexander Neundorf wrote:
> Hi,
> 
> I'm trying to run the tm_basic test on the at91sam7x256 (64kB RAM) but this doesn't seem to work out of the box.
> tm_basic.cxx has this code:
> 
> #define STACK_SIZE (CYGNUM_HAL_STACK_SIZE_TYPICAL+4*1024)
> #define CYG_THREAD_OVERHEAD (STACK_SIZE+ <some more...>)
> 
> #define NTEST_THREADS        ((CYGMEM_REGION_ram_SIZE/16)/CYG_THREAD_OVERHEAD)
> 
> which is here:
> 64kb/16 / ( <something> + 4kb), i.e. 4 kb/(x+4 kb), which is always zero.
> I could start hacking around that, but before that I'd like to ask
> what the recommended way to run tm_basic on the at91sam7 is ?

You need to hack around with it a bit. It is a while since i did this,
but i guess i set STACK_SIZE to 4K and NTEST_THREADS to 2. Or
something like that.

          Andrew

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Re: [ECOS] at91sam7x256 tm_basic problem

[Alexander Neundorf]

> On Thu, Mar 20, 2008 at 10:49:25AM +0100, Alexander Neundorf wrote:
> > Hi,
> > 
> > I'm trying to run the tm_basic test on the at91sam7x256 (64kB RAM) but
> this doesn't seem to work out of the box.
> > tm_basic.cxx has this code:
> > 
> > #define STACK_SIZE (CYGNUM_HAL_STACK_SIZE_TYPICAL+4*1024)
> > #define CYG_THREAD_OVERHEAD (STACK_SIZE+ <some more...>)
> > 
> > #define NTEST_THREADS       
> ((CYGMEM_REGION_ram_SIZE/16)/CYG_THREAD_OVERHEAD)
> > 
> > which is here:
> > 64kb/16 / ( <something> + 4kb), i.e. 4 kb/(x+4 kb), which is always
> zero.
> > I could start hacking around that, but before that I'd like to ask
> > what the recommended way to run tm_basic on the at91sam7 is ?
> 
> You need to hack around with it a bit. It is a while since i did this,
> but i guess i set STACK_SIZE to 4K and NTEST_THREADS to 2. Or
> something like that.

Ok. Why is CYGMEM_REGION_ram_SIZE actually divided by 16 ? Does this just mean "don't use all available RAM for the threads" ?

Alex

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Re: [ECOS] at91sam7x256 tm_basic problem

[Alexander Neundorf]

> > You need to hack around with it a bit. It is a while since i did this,
> > but i guess i set STACK_SIZE to 4K and NTEST_THREADS to 2. Or
> > something like that.
> 
> Ok. Why is CYGMEM_REGION_ram_SIZE actually divided by 16 ? Does this
> just mean "don't use all available RAM for the threads" ?

Ok, it e.g. works with:
#define STACK_SIZE (2*1024)
#define NTEST_THREADS        2

Alex

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