[Xenomai] ARM I-pipe patch for 3.1+ kernels

[Xenomai] ARM I-pipe patch for 3.1+ kernels

[Remco den Breeje]

Hi Gilles et.al.,

I'm interested in running a Xenomai patched system on a Raspberry Pi
computer[1] that compromises a ARM11 CPU (ARMv6 architecture). The Linux
kernels supported on the Raspberry are either Linux 3.1 or 3.2 [2,3], while
the most recent ARM ipipe patch is written for a 3.0 kernel. Looking at
your ipipe git[4], there hasn't been ARM related work for more recent
kernels.
What are the changes of a forward port, rebased on 3.1 or 3.2 kernels? Are
there underlying technical difficulties?

I'm aware that even if there was a >3.0 ARM patch available, the Raspberry
specific code needs to be ported. However, being a ARM-newby, porting board
specific code together with porting the ipipe code is one step too far ;)

Many thanks,

Remco den Breeje

[1] http://en.wikipedia.org/wiki/Raspberry_Pi
[2] https://github.com/raspberrypi/linux
[3] https://github.com/bootc/linux
[4] http://git.denx.de/?p=ipipe.git;a=summary

Re: [Xenomai] ARM I-pipe patch for 3.1+ kernels

[Philippe Gerum]

On 06/21/2012 10:14 PM, Remco den Breeje wrote:
> Hi Gilles et.al.,
>
> I'm interested in running a Xenomai patched system on a Raspberry Pi
> computer[1] that compromises a ARM11 CPU (ARMv6 architecture). The Linux
> kernels supported on the Raspberry are either Linux 3.1 or 3.2 [2,3], while
> the most recent ARM ipipe patch is written for a 3.0 kernel. Looking at
> your ipipe git[4], there hasn't been ARM related work for more recent
> kernels.
> What are the changes of a forward port, rebased on 3.1 or 3.2 kernels? Are
> there underlying technical difficulties?
>
> I'm aware that even if there was a>3.0 ARM patch available, the Raspberry
> specific code needs to be ported. However, being a ARM-newby, porting board
> specific code together with porting the ipipe code is one step too far ;)
>

http://git.denx.de/?p=ipipe-2.6.git;a=shortlog;h=refs/heads/core-3.2


> Many thanks,
>
> Remco den Breeje
>
> [1] http://en.wikipedia.org/wiki/Raspberry_Pi
> [2] https://github.com/raspberrypi/linux
> [3] https://github.com/bootc/linux
> [4] http://git.denx.de/?p=ipipe.git;a=summary
> _______________________________________________
> Xenomai mailing list
> Xenomai@xenomai.org
> http://www.xenomai.org/mailman/listinfo/xenomai
>


-- 
Philippe.

Re: [Xenomai] ARM I-pipe patch for 3.1+ kernels

[Gilles Chanteperdrix]

On 06/21/2012 10:14 PM, Remco den Breeje wrote:
> Hi Gilles et.al.,
> 
> I'm interested in running a Xenomai patched system on a Raspberry Pi
> computer[1] that compromises a ARM11 CPU (ARMv6 architecture). The Linux
> kernels supported on the Raspberry are either Linux 3.1 or 3.2 [2,3], while
> the most recent ARM ipipe patch is written for a 3.0 kernel. Looking at
> your ipipe git[4], there hasn't been ARM related work for more recent
> kernels.
> What are the changes of a forward port, rebased on 3.1 or 3.2 kernels? Are
> there underlying technical difficulties?
> 
> I'm aware that even if there was a >3.0 ARM patch available, the Raspberry
> specific code needs to be ported. However, being a ARM-newby, porting board
> specific code together with porting the ipipe code is one step too far ;)

The ipipe branch core-3.2 supports kernel 3.2 on arm. Note however that
a lot of things have changed in this patch version, so the I-pipe
porting guide is completely helpless.

More generally, the git repository with the current work on the arm
architecture is:
http://git.xenomai.org/ipipe-gch.git

The branch for kernel x.y is for-ipipe-x.y-arm

-- 
                                                                Gilles.

Re: [Xenomai] ARM I-pipe patch for 3.1+ kernels

[Remco den Breeje]

Hi Gilles,

Thanks. I overlooked that one.

Remco

On Thu, Jun 21, 2012 at 10:33 PM, Gilles Chanteperdrix <
gilles.chanteperdrix@xenomai.org> wrote:

> On 06/21/2012 10:14 PM, Remco den Breeje wrote:
> > Hi Gilles et.al.,
> >
> > I'm interested in running a Xenomai patched system on a Raspberry Pi
> > computer[1] that compromises a ARM11 CPU (ARMv6 architecture). The Linux
> > kernels supported on the Raspberry are either Linux 3.1 or 3.2 [2,3],
> while
> > the most recent ARM ipipe patch is written for a 3.0 kernel. Looking at
> > your ipipe git[4], there hasn't been ARM related work for more recent
> > kernels.
> > What are the changes of a forward port, rebased on 3.1 or 3.2 kernels?
> Are
> > there underlying technical difficulties?
> >
> > I'm aware that even if there was a >3.0 ARM patch available, the
> Raspberry
> > specific code needs to be ported. However, being a ARM-newby, porting
> board
> > specific code together with porting the ipipe code is one step too far ;)
>
> The ipipe branch core-3.2 supports kernel 3.2 on arm. Note however that
> a lot of things have changed in this patch version, so the I-pipe
> porting guide is completely helpless.
>
> More generally, the git repository with the current work on the arm
> architecture is:
> http://git.xenomai.org/ipipe-gch.git
>
> The branch for kernel x.y is for-ipipe-x.y-arm
>
> --
>                                                                Gilles.
>

Re: [Xenomai] ARM I-pipe patch for 3.1+ kernels

[Remco den Breeje]

Hi Gilles,

Thanks for pointing that out. I'll take a look.

Remco

On Thu, Jun 21, 2012 at 10:33 PM, Gilles Chanteperdrix <
gilles.chanteperdrix@xenomai.org> wrote:

> On 06/21/2012 10:14 PM, Remco den Breeje wrote:
> > Hi Gilles et.al.,
> >
> > I'm interested in running a Xenomai patched system on a Raspberry Pi
> > computer[1] that compromises a ARM11 CPU (ARMv6 architecture). The Linux
> > kernels supported on the Raspberry are either Linux 3.1 or 3.2 [2,3],
> while
> > the most recent ARM ipipe patch is written for a 3.0 kernel. Looking at
> > your ipipe git[4], there hasn't been ARM related work for more recent
> > kernels.
> > What are the changes of a forward port, rebased on 3.1 or 3.2 kernels?
> Are
> > there underlying technical difficulties?
> >
> > I'm aware that even if there was a >3.0 ARM patch available, the
> Raspberry
> > specific code needs to be ported. However, being a ARM-newby, porting
> board
> > specific code together with porting the ipipe code is one step too far ;)
>
> The ipipe branch core-3.2 supports kernel 3.2 on arm. Note however that
> a lot of things have changed in this patch version, so the I-pipe
> porting guide is completely helpless.
>
> More generally, the git repository with the current work on the arm
> architecture is:
> http://git.xenomai.org/ipipe-gch.git
>
> The branch for kernel x.y is for-ipipe-x.y-arm
>
> --
>                                                                Gilles.
>