Re: [ptxdist] ptxdist: Adding custom kernel headers

[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.

Regards,
Juergen

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Pengutronix e.K.                              | Juergen Borleis             |
Industrial Linux Solutions                    | http://www.pengutronix.de/  |

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