Re: Simulator Memory_contigAlloc

Wed, 06 Feb 2008 09:48:37 -0800

Josh,

Memory_contigAlloc() function on the DSP allocates data from the segment defined in the "osalGlobal.defaultMemSegId" field  in your .cfg configuration file. If this field is left undefined, which it typically is, the system assigns this field to be "DDR2".

... which is fine for Memory_alloc() which is used to dynamically allocate small amounts of memory for system needs, but not for Memory_contigAlloc() which usually asks for much more, as you know.

So adding this line to your .cfg file,

    osalGlobal.defaultMemSegId = "DDRALGHEAP";

should solve the problem. (I'm assuming you have a 'var osalGlobal = xdc.useModule( "ti.sdo.ce.osal.Global" );' in your .cfg file already.)

Another way to solve the problem is to combine DDRALGHEAP and DDR2 into just one large segment, DDR2 (which is often what people on DSP-only systems do), but I don't know if that would work with your simulator.

Regards,
Davor

Joshua Hintze wrote:

My next question is how does the Memory_contigAlloc function work in the simulator? My understanding is that normally (on linux) it works by accessing the CMEMK module and having that allocate a region that I define.

 

However since I’m running this local to the DSP (for testing purposes). I would have thought that it would have just been a wrapper for malloc(). The problem is that it is allocating memory in the DDR2 section I have defined in my .tcf file. Even though I have

 

prog.module("MEM").MALLOCSEG  = bios.DDRALGHEAP;

 

So when I try to allocate a 4 Meg continous buffer it fails becauses its trying to allocate in the DD2 which is a lot smaller than my DDRALGHEAP.

 

For the time being I can probably just replace it with malloc but I would like to know if anybody has ideas.

 

Thanks,

 

Josh

 


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