[Xenomai-help] ARM926EJ-S and Xenomai

[Xenomai-help] ARM926EJ-S and Xenomai

[Stankiewicz Bredkjaer]

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Hi all,

As a newbie with no experience with Xenomai, I would like to know if Texas Instruments Davinci Evaluation boards, especially the ARM926EJ arch. have been already ported?
I'm working with the Davinci dm6467 board and it is delivered with a montavista patched 2.6.10 Linux kernel on which I would like to install Xenomai. Is it possible?
Is there something i have to know prior installing Xenomai on the Board?

Any answer will be appreciated.

Regards,

Stan




      

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Re: [Xenomai-help] ARM926EJ-S and Xenomai

[Gilles Chanteperdrix]

Stankiewicz Bredkjaer wrote:
> Hi all,
> 
> As a newbie with no experience with Xenomai, I would like to know if
> Texas Instruments Davinci Evaluation boards, especially the ARM926EJ
> arch. have been already ported? I'm working with the Davinci dm6467
> board and it is delivered with a montavista patched 2.6.10 Linux
> kernel on which I would like to install Xenomai. Is it possible? Is
> there something i have to know prior installing Xenomai on the Board?

Hi,

usually, adding an ARM board to the I-pipe patch is just a few days
work, and is documented in Xenomai wiki.

However, it is easy for vanilla kernels where the board-independent
infrastructure already exists, which means 2.6.1[4-5] or 2.6.2[0,4-6]

I have already heard about these davinci boards, and they seem to have a
lot of drivers. It is not easy, but I would advise you to migrate to the
latest kernel (2.6.26), port the drivers to this new kernel (this is the
non-easy part, because kernel APIs have a tendency to evolve rapidly
over time), then port Xenomai for your board.

Regards.

-- 
                                                 Gilles.

Re: [Xenomai-help] ARM926EJ-S and Xenomai

[Stankiewicz Bredkjaer]

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Hi,

thanks for the quick answer. I think, I will follow your advice and first move to a vanilla Kernel and see how i can easily port the drivers if needed.

Regards,

Stan.

--- On Fri, 8/22/08, Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org> wrote:
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Subject: Re: [Xenomai-help] ARM926EJ-S and Xenomai
To: stan.bred@domain.hid
Cc: xenomai@xenomai.org
Date: Friday, August 22, 2008, 7:25 PM

Stankiewicz Bredkjaer wrote:
> Hi all,
> 
> As a newbie with no experience with Xenomai, I would like to know if
> Texas Instruments Davinci Evaluation boards, especially the ARM926EJ
> arch. have been already ported? I'm working with the Davinci dm6467
> board and it is delivered with a montavista patched 2.6.10 Linux
> kernel on which I would like to install Xenomai. Is it possible? Is
> there something i have to know prior installing Xenomai on the Board?

Hi,

usually, adding an ARM board to the I-pipe patch is just a few days
work, and is documented in Xenomai wiki.

However, it is easy for vanilla kernels where the board-independent
infrastructure already exists, which means 2.6.1[4-5] or 2.6.2[0,4-6]

I have already heard about these davinci boards, and they seem to have a
lot of drivers. It is not easy, but I would advise you to migrate to the
latest kernel (2.6.26), port the drivers to this new kernel (this is the
non-easy part, because kernel APIs have a tendency to evolve rapidly
over time), then port Xenomai for your board.

Regards.

-- 
                                                 Gilles.



      

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Re: [Xenomai-help] ARM926EJ-S and Xenomai

[Gilles Chanteperdrix]

Stankiewicz Bredkjaer wrote:
> Hi,
> 
> thanks for the quick answer. I think, I will follow your advice and
> first move to a vanilla Kernel and see how i can easily port the
> drivers if needed.

I think it is the best thing to do, really. If we admit that the
montavista people did actually improve performance of the 2.6.10 kernel,
everybody will agree, even montavista, and tell you that the performance
improvements of a recent kernel are superior.

-- 
                                                 Gilles.

Re: [Xenomai-help] ARM926EJ-S and Xenomai

[Stankiewicz Bredkjaer]

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Hi  Bosko,
yeah Atmel's AT91SAM926x is similar to the one I'm using.
I am sure checking to see what I have to change and what not.
I'll let you know, if I'm stuck anywhere.

Thanks for the hints.

Regards,

Stan.


--- On Fri, 8/22/08, Bosko Radivojevic <bosko.radivojevic@domain.hid> wrote:
From: Bosko Radivojevic <bosko.radivojevic@domain.hid>
Subject: Re: [Xenomai-help] ARM926EJ-S and Xenomai
To: stan.bred@domain.hid
Date: Friday, August 22, 2008, 9:31 PM

Hi Stan,

ARM926EJ CPU is fully supported both by vanilla Linux and by I-Pipe
Adeos (on which Xenomai relies). Gilles is right, a lot of changes
happen in Linux kernel between 2.6.10 and the newest 2.6.26 version.
In the meantime, a lot of davinci drivers are incorporated in 2.6.26
version. Besides that, I saw a few new patches that have good chance
to be part of 2.6.27.

>From my point of view, besides maybe some not so big changes on the
linux side, you'll have to add board support to the Xenomai. There are
similar (with the same CPU) boards supported, like Atmel's
AT91SAM926x. As Gilles said, you can copy&paste a lot of code from
Linux drivers (timer, gpio, etc) :)

If you need some help, please ask.

Sincerely,
Bosko



      

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