Problem with shared memory module for ppc

[Wolfgang Grandegger]

On 06/09/2004 10:16 AM Anthony Mallet wrote:
>  | On 06/08/2004 05:03 PM Anthony Mallet wrote:
>  | > I am trying to share memory between user space programs and kernel using
>  | > rtai-3.0r4 / linux*PPC*-2.4.26.
> 
> Wolfgang Grandegger writes:
> | Hm, it works just fine here:
> 
> Damn... Well... I'd have guessed it :)
> 
> | Try to make a fresh rebuild of RTAI and your test modules/programs. And
> | what PPC system are you using? How much memory do you have (free)?
> 
> Actually I did a fresh build of everything right before testing my sample
> programs on a newly compiled 2.4.18 kernel...
> We are using a PCore CPCI 3750, with 128Mb RAM, diskless, no swap.
> The free memory is around 100Mb or more iirc. (I loaded nothing but rtai
> modules and my test programs).

OK. I have a 750 based system as well. I will try and have a look later
this week.

> What I can do is to try to mmap vmalloc'ed mem in userspace myself,
> i.e. without rtai, just to try to isolate things... But I'll probably
> need some help :o) If you would have some sample test code, it would save
> me a lot of time!
> Or if you have other ideas...

Well, I have more the impression, that there is something else wrong.
For example. How does it come that you have to do:

  ln -s /dev/misc/RTAI_SHM /dev/rtai_shm

How got /dev/misc/RTAI_SHM created. Can I have a look to your .config file.

Wolfgang.