[libcamera-devel] libcamera starting point on px30 evk

[Jacopo Mondi]

Hi Tommaso,

On Thu, May 12, 2022 at 12:07:20PM +0200, Tommaso Merciai via libcamera-devel wrote:
> On Thu, May 12, 2022 at 10:43:51AM +0100, Kieran Bingham wrote:
> > Hi Tommaso,
> >
> > Quoting Tommaso Merciai via libcamera-devel (2022-05-12 10:31:07)
> > > Hi all,
> > > I'm trying to start to play with libcamera on PX30_Mini_EVB_V11.
> > > Can you give me some tips on build image with all libcamera dependencies
> > > for this type of SOC. Like buildroot Image or Yocto Image.
> >
> > libcamera is supported by buildroot, and as you've seen also by yocto. I
> > haven't followed the Yocto support, so I don't know who keeps it
> > updated, but I know buildroot received a patch to update to a quite
> > recent libcamera release in the last few days.
> >
> > > Actually I have compiled multimedia-libcamera-image with sdk using Yocto. I'm able
> > > to compile libcamera project with this. Could be a good starting point?
> > > Or you suggest another way?
> >
> > I would say 'yes', but you will likely want to be able to specify the
> > latest version of libcamera to build, and there may be more active
> > development ongoing and required for your platform, so you probably
> > don't want to 'wait' for someone to update the Yocto release. (Or you
> > could post the updates to the yocto project too).
> >
> > (Wanting to use the latest libcamera applies to buildroot too of course)
> >
> > --
> > Regards
> >
> > Kieran
>
>
> Hi Kieran,
> Thanks for your quick reply and your suggestion. Can you point me a good link to build a
> an image that support libcamera using buildroot?
>

Alternatively, you can use the buildroot-built toolchain andsysroot to
build libcamera externally. Build your buildroot image as you would
regularly do, then you can clone and build libcamera externally using
a cross-file for meson, to instruct the build system to use the same
toolchain as the one you have compiled your rootfs with.

The one I use looks like:

--------------------------------------------------------------------------------
$ cat meson-cross-buildroot
[binaries]
c = '/home/build/buildroot/output/host/bin/aarch64-buildroot-linux-gnu-gcc'
cpp = '/home/build/buildroot/output/host/bin/aarch64-buildroot-linux-gnu-g++'
ar = '/home/build/buildroot/output/host/bin/aarch64-buildroot-linux-gnu-ar'
strip = '/home/build/buildroot/output/host/bin/aarch64-buildroot-linux-gnu-strip'
pkgconfig = '/home/build/buildroot/output/host/usr/bin/pkg-config'
cmake = '/home/build/buildroot/output/host/usr/bin/cmake'
qmake = '/bin/false'

[properties]
needs_exe_wrapper = true

[built-in options]
c_args = ['-D_LARGEFILE_SOURCE', '-D_LARGEFILE64_SOURCE', '-D_FILE_OFFSET_BITS=64']
c_link_args = []
cpp_args = ['-D_LARGEFILE_SOURCE', '-D_LARGEFILE64_SOURCE', '-D_FILE_OFFSET_BITS=64']
cpp_link_args = []

[host_machine]
system = 'linux'
cpu_family ='aarch64'
cpu = 'cortex-a57.cortex-a53'
endian = 'little'

$ meson build --cross-file meson-cross-buildroot
$ cd build; ninja
--------------------------------------------------------------------------------

> Thanks,
> Tommaso
>
> >
> >
> >
> > >
> > > Thanks in advance,
> > > Tommaso
> > >
> > > --
> > > Tommaso Merciai
> > > Embedded Linux Engineer
> > > tommaso.merciai at amarulasolutions.com
> > > __________________________________
> > >
> > > Amarula Solutions SRL
> > > Via Le Canevare 30, 31100 Treviso, Veneto, IT
> > > T. +39 042 243 5310
> > > info at amarulasolutions.com
> > > www.amarulasolutions.com
>
> --
> Tommaso Merciai
> Embedded Linux Engineer
> tommaso.merciai at amarulasolutions.com
> __________________________________
>
> Amarula Solutions SRL
> Via Le Canevare 30, 31100 Treviso, Veneto, IT
> T. +39 042 243 5310
> info at amarulasolutions.com
> www.amarulasolutions.com