[Xenomai] Availability of ARM adeos patch for 3.5 kernel, and RTDM SPI for iMX6 ?

[Xenomai] Availability of ARM adeos patch for 3.5 kernel, and RTDM SPI for iMX6 ?

[Thierry Bultel]

Hi,

I noticed on git that the latest available patch for ARM is
ipipe-core-3.2.21-arm-1.patch,
that I assume, replaces the mxc pre+std+post mecanism, please tell me if
I am wrong.

I would like to know is there is an estimated date for the availability
of the patch for the 3.5 kernel ?

My last question is about SPI, will an RTDM driver for the SPI of the
iMX6 be available ?

Thanks
Thierry

Re: [Xenomai] Availability of ARM adeos patch for 3.5 kernel, and RTDM SPI for iMX6 ?

[Gilles Chanteperdrix]

On 08/24/2012 12:06 PM, Thierry Bultel wrote:

> Hi,
> 
> I noticed on git that the latest available patch for ARM is
> ipipe-core-3.2.21-arm-1.patch,
> that I assume, replaces the mxc pre+std+post mecanism, please tell me if
> I am wrong.


The pre+std+post mechanism is used to apply a patch for mainline kernel
to the Freescale linux tree. If you want to use that tree, you always
need that mechanism. ipipe-core-3.2.21-arm-1.patch is a patch for the
mainline kernel.

> 
> I would like to know is there is an estimated date for the availability
> of the patch for the 3.5 kernel ?


Due to lack of time, the next patch will probably be for 3.6. We already
have support for 3.4 kernel, which you can use checking out:
git://git.denx.de/ipipe.git
for the kernel, and
git://git.xenomai.org/xenomai-2.6.git
for xenomai.

Note that 3.4 is probably a good choice as it has been announced that it
will be maintained for one year.

Note that we have some unfinished business on imx6:
- we have some random crashes, which I think are probably solved in 3.4
(and need backporting in 3.2 and 3.0, either way)
- we have some high latencies, I think they may be due to the bug
discovered in this thread:
http://lists.infradead.org/pipermail/linux-arm-kernel/2012-August/113087.html

But I need to spend some time on the actual hardware to validate these
hypotheses.

> 
> My last question is about SPI, will an RTDM driver for the SPI of the
> iMX6 be available ?


Sure, if someone writes it, we will be happy to merge it in xenomai sources.

-- 
                                                                Gilles.

Re: [Xenomai] Availability of ARM adeos patch for 3.5 kernel, and RTDM SPI for iMX6 ?

[Thierry Bultel]

Le 24/08/2012 12:59, Gilles Chanteperdrix a écrit :
> On 08/24/2012 12:06 PM, Thierry Bultel wrote:
>
>> Hi,
>>
>> I noticed on git that the latest available patch for ARM is
>> ipipe-core-3.2.21-arm-1.patch,
>> that I assume, replaces the mxc pre+std+post mecanism, please tell me if
>> I am wrong.
>
> The pre+std+post mechanism is used to apply a patch for mainline kernel
> to the Freescale linux tree. If you want to use that tree, you always
> need that mechanism. ipipe-core-3.2.21-arm-1.patch is a patch for the
> mainline kernel.
Thanks for the clarification.
When you refer to Freescale linux tree, are you talking about

https://github.com/Freescale/linux-imx* *?

If yes, the latest version there is 3.5-rc7. 

The CPU module vendor is likely to base its BSP on a Freescale kernel, probably that one, so I am 
concerned about finding a matching patch to apply on.
What would you advise ? Taking in account what you mention below, is the backport from Freescale
3.5-rc7 to mainline 3.4 the most suitable solution, or a port of the adeos patch in the opposite way ?

Thanks

>
>> I would like to know is there is an estimated date for the availability
>> of the patch for the 3.5 kernel ?
>
> Due to lack of time, the next patch will probably be for 3.6. We already
> have support for 3.4 kernel, which you can use checking out:
> git://git.denx.de/ipipe.git
> for the kernel, and
> git://git.xenomai.org/xenomai-2.6.git
> for xenomai.
>
> Note that 3.4 is probably a good choice as it has been announced that it
> will be maintained for one year.
>
> Note that we have some unfinished business on imx6:
> - we have some random crashes, which I think are probably solved in 3.4
> (and need backporting in 3.2 and 3.0, either way)
> - we have some high latencies, I think they may be due to the bug
> discovered in this thread:
> http://lists.infradead.org/pipermail/linux-arm-kernel/2012-August/113087.html
>
> But I need to spend some time on the actual hardware to validate these
> hypotheses.
>
>> My last question is about SPI, will an RTDM driver for the SPI of the
>> iMX6 be available ?
>
> Sure, if someone writes it, we will be happy to merge it in xenomai sources.
>

Re: [Xenomai] Availability of ARM adeos patch for 3.5 kernel, and RTDM SPI for iMX6 ?

[Wolfgang Grandegger]

On 08/24/2012 02:49 PM, Thierry Bultel wrote:
> Le 24/08/2012 12:59, Gilles Chanteperdrix a écrit :
>> On 08/24/2012 12:06 PM, Thierry Bultel wrote:
>>
>>> Hi,
>>>
>>> I noticed on git that the latest available patch for ARM is
>>> ipipe-core-3.2.21-arm-1.patch,
>>> that I assume, replaces the mxc pre+std+post mecanism, please tell me if
>>> I am wrong.
>>
>> The pre+std+post mechanism is used to apply a patch for mainline kernel
>> to the Freescale linux tree. If you want to use that tree, you always
>> need that mechanism. ipipe-core-3.2.21-arm-1.patch is a patch for the
>> mainline kernel.
> Thanks for the clarification.
> When you refer to Freescale linux tree, are you talking about
> 
> https://github.com/Freescale/linux-imx* *?
> 
> If yes, the latest version there is 3.5-rc7. 

No, but "http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/"

> The CPU module vendor is likely to base its BSP on a Freescale kernel, probably that one, so I am 
> concerned about finding a matching patch to apply on.
> What would you advise ? Taking in account what you mention below, is the backport from Freescale
> 3.5-rc7 to mainline 3.4 the most suitable solution, or a port of the adeos patch in the opposite way ?

There is resonable support for the i.MX6Q Sabrelite board in the
mainline kernel. In principle, you would need to backport it to 3.4.x or
push the iPipe patches forward to 3.6-rcX.

Wolfgang.

Re: [Xenomai] Availability of ARM adeos patch for 3.5 kernel, and RTDM SPI for iMX6 ?

[Gilles Chanteperdrix]

On 08/24/2012 03:44 PM, Wolfgang Grandegger wrote:
> On 08/24/2012 02:49 PM, Thierry Bultel wrote:
>> Le 24/08/2012 12:59, Gilles Chanteperdrix a écrit :
>>> On 08/24/2012 12:06 PM, Thierry Bultel wrote:
>>>
>>>> Hi,
>>>>
>>>> I noticed on git that the latest available patch for ARM is
>>>> ipipe-core-3.2.21-arm-1.patch,
>>>> that I assume, replaces the mxc pre+std+post mecanism, please tell me if
>>>> I am wrong.
>>>
>>> The pre+std+post mechanism is used to apply a patch for mainline kernel
>>> to the Freescale linux tree. If you want to use that tree, you always
>>> need that mechanism. ipipe-core-3.2.21-arm-1.patch is a patch for the
>>> mainline kernel.
>> Thanks for the clarification.
>> When you refer to Freescale linux tree, are you talking about
>>
>> https://github.com/Freescale/linux-imx* *?
>>
>> If yes, the latest version there is 3.5-rc7. 
> 
> No, but "http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/"
> 
>> The CPU module vendor is likely to base its BSP on a Freescale kernel, probably that one, so I am 
>> concerned about finding a matching patch to apply on.
>> What would you advise ? Taking in account what you mention below, is the backport from Freescale
>> 3.5-rc7 to mainline 3.4 the most suitable solution, or a port of the adeos patch in the opposite way ?
> 
> There is resonable support for the i.MX6Q Sabrelite board in the
> mainline kernel. In principle, you would need to backport it to 3.4.x or
> push the iPipe patches forward to 3.6-rcX.

Finally, we will have a patch for 3.5. But in any case I would not
recommend working with an -rc kernel.

-- 
					    Gilles.