Re: [ptxdist] ptxdist: Adding custom kernel headers

[Guillermo Rodriguez Garcia <guille.rodriguez@gmail.com>]

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Hi Juergen,

2015-01-28 9:44 GMT+01:00 Juergen Borleis <jbe@pengutronix.de>:

> Hi Guillermo,
>
> On Tuesday 27 January 2015 21:45:08 Guillermo Rodriguez Garcia wrote:
> > 2015-01-27 21:28 GMT+01:00 Guillermo Rodriguez Garcia
> > guille.rodriguez@gmail.com>:
> > > 2015-01-27 8:31 GMT+01:00 Markus Niebel <list-09_ptxdist@tqsc.de>:
> > > > Am 26.01.2015 um 20:16 schrieb Guillermo Rodriguez Garcia:
> > > > > I wrote a custom driver for my BSP, and I initially made it an
> > > > > out-of-tree driver (ptxdist newpackage src-linux-driver and so on)
> > > > >
> > > > > This driver needs to export a header file (defining some ioctl
> values)
> > > > > for use by other (custom) ptxdist packages. I am currently
> exporting
> > > > > this header file in the "install" stage of the out-of-tree driver:
> > > > >
> > > > > cp $(MY_DRIVER_DIR)/someheader.h
> $(PTXDIST_SYSROOT_TARGET)/usr/include
> > > > >
> > > > > So far so good.
> > > > >
> > > > > Now I would like to transform this out-of-tree driver into an
> in-tree
> > > > > driver and for that I am generating a set of patches against the
> > > > > kernel tree. My question is: How can I export the custom header in
> > > > > this case? I assume that modifying the generic kernel.make is not
> the
> > > > > way to go.
> > > > >
> > > > > Any hints?
> > > >
> > > > split the internal from the external part and place the header to
> export
> > > > under
> > > > <kernel>/include/uapi/<correct subdir>
> > > > modify the Kbuild script in this subdir to add your header to the
> > > > headers to export
> > > > Generate patch series for your kernel and use this kernel version for
> > > > the kernel header package in ptxdist
> > >
> > > Thank you, I think this is exactly what I needed!
> >
> > Just playing with this now, is it normal that after selecting the kernel
> > headers package in ptxdist it wants to rebuild all other packages?
>
> Yes. Changes on the kernel-header package settings have a deep impact.
>
> > Is there any way to use the "modified" kernel headers only for a specific
> > package (the custom driver mentioned above) without affecting the rest of
> > the packages?
>
> If you create your own kernel-header package you can depend on it without
> affecting the remaining packages depending on the generic kernel-header
> package.
>
> A few weeks ago I had a similar issue and solved it (at least for the time
> of
> development) by adding the include path to the new ioctl file in my
> development kernel source tree into the package rule file. After finishing
> development the new ioctl file is now part of the kernel patch stack and
> the
> additional include path is now gone as well.
>

Thank you for the feedback.
I'm not sure to understand this, can you elaborate on how you did this
exactly?

Did you create your own kernel-header package ?

Guillermo

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