[Buildroot] Xenomai package not extracted in time

[Buildroot] Xenomai package not extracted in time

[gpontis at spamcop.net]

I'm working with buildroot 2013.05, ARM, and Xenomai 2.6.2.1. As part of
making Xenomai go, there is a kernel patch. I keep that patch under my board
directory and point to it with BR2_LINUX_KERNEL_EXT_XENOMAI_ADEOS_PATCH. The
build is failing because a script (from Xenomai) that is used to apply this
patch is not available. It is not available because the Xenomai package has
not been extracted yet. If I manually extract the Xenomai package once then
all goes ahead smoothly. A few versions back of Xenomai and buildroot, this
worked automatically. I don't know if I broke something or if the BR
environment has somehow changed. But can someone offer guidance on how to
fix it so he manual step is not necessary ?

 

TIA

 

Geo. 

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[Buildroot] Xenomai package not extracted in time

[Thomas Petazzoni]

Dear gpontis at spamcop.net,

On Thu, 20 Jun 2013 09:10:50 -0700, gpontis at spamcop.net wrote:
> I'm working with buildroot 2013.05, ARM, and Xenomai 2.6.2.1. As part of
> making Xenomai go, there is a kernel patch. I keep that patch under my board
> directory and point to it with BR2_LINUX_KERNEL_EXT_XENOMAI_ADEOS_PATCH. The
> build is failing because a script (from Xenomai) that is used to apply this
> patch is not available. It is not available because the Xenomai package has
> not been extracted yet. If I manually extract the Xenomai package once then
> all goes ahead smoothly. A few versions back of Xenomai and buildroot, this
> worked automatically. I don't know if I broke something or if the BR
> environment has somehow changed. But can someone offer guidance on how to
> fix it so he manual step is not necessary ?

Can you share a .config (with all the necessary things) so that we can
reproduce the issue?

Thanks,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

[Buildroot] Xenomai package not extracted in time

[Thomas Petazzoni]

Dear gpontis at spamcop.net,

On Thu, 20 Jun 2013 09:10:50 -0700, gpontis at spamcop.net wrote:

> I'm working with buildroot 2013.05, ARM, and Xenomai 2.6.2.1. As part of
> making Xenomai go, there is a kernel patch. I keep that patch under my board
> directory and point to it with BR2_LINUX_KERNEL_EXT_XENOMAI_ADEOS_PATCH. The
> build is failing because a script (from Xenomai) that is used to apply this
> patch is not available. It is not available because the Xenomai package has
> not been extracted yet. If I manually extract the Xenomai package once then
> all goes ahead smoothly. A few versions back of Xenomai and buildroot, this
> worked automatically. I don't know if I broke something or if the BR
> environment has somehow changed. But can someone offer guidance on how to
> fix it so he manual step is not necessary ?

Ok, I see where the problem is. The Xenomai Linux extension code in
linux/linux-ext-xenomai.mk properly makes the 'linux' package depends
on the 'xenomai' package. However, the dependencies are only handled at
the configure step of all packages. I.e, before the Linux configuration
starts, you have the guarantee that Xenomai will have been built (and
therefore extracted).

However, in the case of the Xenomai extension, the Xenomai package is
needed during the *patch* step of Linux, to ensure that the
prepare-kernel.sh script of Xenomai is available to patch the kernel.

And guess what? The reason why it's broken now is because we changed
the dependency handling to support... RTAI!

See commit a473a616d27e46951a23d90249a31b08006098bf ("package: change
ordering of steps").

Maybe I don't have both of my eyes fully opened, but reading the RTAI
stuff, I don't see how it can work. It pulls "rtai-patch" as a
dependency of Linux, and then uses RTAI patches in the patch step of
Linux. But the dependency 'rtai-patch' is only guaranteed to be pulled
in before 'linux-configure' starts, not before 'linux-patch' starts.
How can this stuff work?

I guess this needs some testing and investigation :)

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

[Buildroot] Xenomai package not extracted in time

[Thomas Petazzoni]

Dear George Pontis,

Please don't reply to me only, but also to the list.

On Thu, 20 Jun 2013 10:24:14 -0700, George Pontis wrote:
> Thanks for your attention Thomas. I look forward to a fix, but in the short
> term I'll look at the commit and see if I can back it out temporarily since
> we only use Xenomai.

Backing out the commit will be hard because many other related changes
have been done since then.

You can try adding a line like:

linux-patch: xenomai-extract

in the linux/linux-ext-xenomai.mk.

Completely untested, of course.

Best regards,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

[Buildroot] FW: Xenomai package not extracted in time

[gpontis at spamcop.net]

> -----Original Message-----
> From: Thomas Petazzoni [mailto:thomas.petazzoni at free-electrons.com]
> Sent: Thursday, June 20, 2013 10:40 AM
> To: George Pontis
> Cc: buildroot at uclibc.org
> Subject: Re: [Buildroot] Xenomai package not extracted in time
> 
> Dear George Pontis,
> 
> Please don't reply to me only, but also to the list.
> 
> On Thu, 20 Jun 2013 10:24:14 -0700, George Pontis wrote:
> > Thanks for your attention Thomas. I look forward to a fix, but in 
> > the short term I'll look at the commit and see if I can back it out 
> > temporarily since we only use Xenomai.
> 
> Backing out the commit will be hard because many other related changes 
> have been done since then.
> 
> You can try adding a line like:
> 
> linux-patch: xenomai-extract
> 
> in the linux/linux-ext-xenomai.mk.
> 
> Completely untested, of course.
> 
> Best regards,
> 
> Thomas

That seems to take care of it. Thank you Thomas.

- Geo.