Re: [ECOS] eCos port of ARX Xscale almost completed memalloc problem

[Jonathan Larmour <jifl at eCosCentric dot com>]

Costas Santos, Julio wrote:
> To whom it may concern,
>  
> Hi we have a port of ecos for the Xscale processor almost ready but we are
> facing a problem quite difficult to find a solution for.
>
> We have basically taken the IQ80310 eCos hal and copied it. Then generated a
> new target xxxx which basically uses the same 80200 processor and same
> memory layout (0xa0000000 - 0xa2000000). We have support for serial port and
> therefore get diagnostic outputs. 
>  
> However the board is hanging before ecos entry point (cyg_user_start) is
> reached. We have debugged that (in invoke_constructors) and found that it
> was hanging at: 
> .text._GLOBAL_.I.47000.cygmem_memalloc_heaps
>                 0xa103e3c8       0x18
> ............/lib/libtarget.a(services_memalloc_common_heaps.o)
>  
> So in order to isolate the problem the CYGPKG_MEMALLOC_MALLOC_ALLOCATORS
> component was disabled and then ecos initialised fine, getting up to ecos
> entry point.
>  
> However in order to carry on with our port we require the memalloc package
> to be included in our ecos configuration. We have checked memory layouts,
> and heap generation but still cannot find any problem. 
>  
> Any suggestions are welcome?

Your memory map is probably wrong for your target (or possibly your MMU 
isn't set up right, whatever). You could probably get a better indicator 
of where the problem is by changing the default allocator from dlmalloc to 
 the "Simple variable block allocator". That should allow your system to 
boot, but the problem will almost certainly still be there.

Then run the "heaptest" program which should hopefully indicate at what 
addresses it's having trouble.

It's also worth ensuring CYGPKG_INFRA_DEBUG is enabled for maximum checking.

Jifl
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