Re: [Xenomai-help] [Xenomai -help] User space access to DMA memory

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

Herrera-Bendezu, Luis wrote:
> Gilles:
> 
>> Herrera-Bendezu, Luis wrote:
>>> Hello:
>>>
>>> I have the following setup:
>>> PPC405EX
>>> Linux 2.6.30.3
>>> Xenomai 2.4.10
>>> I-pipe 2.7-02
>>> ppc_4xx-gcc (GCC) 4.2.2
>>> Configuration file is attached
>> Do you have the same issue with the latest version of the I-pipe patch
>> for this same version of the Linux kernel? It should be 2.8-00.
> 
> Tried I-pipe 2.8-00 which needs Linux 2.6.32.

Sorry, I misread the ftp list, I was rather thinking about:
http://download.gna.org/adeos/patches/v2.6/powerpc/older/adeos-ipipe-2.6.30.3-powerpc-DENX-2.7-06.patch


 It resulted on same problem
> as reported with Linux 2.6.30.3 I-pipe 2.7-02.
> 
> Was there any particular set of changes that you expected it could fix the
> problem? Do you think more recent versions may work? If yes, which version
> could be tried?

Yes, there was a fix, specifially in the powerpc tree, with mappings
issue. But I think it is older than 2.6.32.

Now that I look at your message again, your problem seems more likely to
be in your code. Specifically, you say: "bus address returned by
pci_alloc_consistent()". I do not think pci_alloc_consistent return
value is a bus address. The dma_handle returned by pointer probably is.
But I am not sure you are supposed to know this.

Please post your code (or a minimal, standalone version of it which
demonstrates the problem).

-- 
                                                                Gilles.