[Buildroot] [PATCH 0 of 2 v2] Add Xenomai real-time framework
arnout at mind.be
Thu Sep 15 08:02:44 UTC 2011
On Thursday 15 September 2011 09:13:19, Thomas Petazzoni wrote:
> > > Xenomai comes with a Linux Kernel and user-space part.
> > > I added a Linux extensions sub-menu (The first patch) which handles
> > > the kernel modification provided by Adeos/Xenomai. The advantage of
> > > this way is for maintenance purpose. (Xenomai do not provide a full
> > > kernel patch, but use a script called "prepare-kernel.sh")
> > > Also, this split the user-space from the kernel in a nice way
> > > instead of adding a serie of patches.
> > I don't agree with this split. When you're configuring Xenomai, I
> > think you want the Adeos patch and the other Xenomai configuration in
> > a single place, not spread over two separate menu items. And the
> > same reasoning goes for maintaining the buildroot parts of Xenomai.
> Yes, but the Buildroot infrastructure makes it a lot easier to
> integrate the Xenomai userspace libraries separately from the
> kernel-side patching integration. Moreover, as detailed in the
> documentation, there are people who do not use Buildroot to build their
> kernel, but only to build their root filesystem.
> Or maybe I missed your point ?
I guess :-)
I'll give two examples:
1. You use buildroot for building kernel and Xenomai userspace (which I think
is the usual case). Now you want to use kernel 2.6.38 instead of 2.6.35 (the
latest included in Xenomai 2.5.6), so you download the appropriate Adeos
patch. In this case you have to go to a completely different configuration
menu to configure your Xenomai setup.
You could say that the Adeos patch config option is conveniently close to the
kernel version option, but if you're using the buildroot toolchain and 'kernel
same as toolchain kernel headers', it's not.
2. You're updating the buildroot support for Xenomai. The new Xenomai version
requires you to call prepare-kernel.sh in a slightly different way. Now you
have to look in two different directories and two different makefiles to keep
It's no big issue, but I simply don't see the advantage of splitting in this
way. Putting the 'Xenomai kernel patch' option right below the 'Xenomai
userspace' option instead of in a completely different menu doesn't stop you
from selecting either or both.
Arnout Vandecappelle arnout at mind be
Senior Embedded Software Architect +32-16-286540
G.Geenslaan 9, 3001 Leuven, Belgium BE 872 984 063 RPR Leuven
LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle
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