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Date: Wed, 13 Oct 2010 14:36:45 +0200
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai-help] rt_heap and DMA32 zone
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To: "Daniel Jacques (Alten)" <jacques.daniel@domain.hid>
Cc: xenomai@xenomai.org

Daniel Jacques (Alten) wrote:
> Please find bellow and in attachment the requested information:
> 
> Linux kernel: 2.6.32.15
> Adeos patch: adeos-ipipe-2.6.32.15-x86-2.7-01.patch
> Xenomai: 2.5.4
> Host Linux distribution: Based on Debian 5.0
> Compiler: gcc version 4.3.2
> 
> Piece of code:
> #define HEAP_SIZE_IN_BYTES 16*1024*1024 
> static int __init audioInit_module(void)
> {
> int status;
> RT_HEAP heap;
> 
>  ...
> 
>   /* Create the global heap */
>   if( (status = rt_heap_create(&heap, "audioInputHeap", HEAP_SIZE_IN_BYTES, H_SHARED|H_DMA )) < 0 ) 
>   {
>     printk("rt_heap_create audioInputHeap error %d\n", status );
>     return status;        
>   }
>   else
>   {
>     printk ("Heap audioInputHeap created\n");
>   }
> 
> ...
> 
> }

So, if I understand correctly, the problem is that Linux does not use
the DMA32 pool when it is passed the GFP_DMA flag? In that case, you
probably need an H_DMA32 flag, which get translated into GFP_DMA32 by
the rtheap code.

-- 
					    Gilles.