[Buildroot] [RFC v2] linux: add fbtft kernel extension

Peter Seiderer ps.report at gmx.net
Tue Dec 30 23:00:58 UTC 2014


Hello Yann,

> Gesendet: Dienstag, 30. Dezember 2014 um 23:36 Uhr
> Von: "Yann E. MORIN" <yann.morin.1998 at free.fr>
> An: "Peter Seiderer" <ps.report at gmx.net>
> Cc: buildroot at busybox.net, loucrittenden63 at gmail.com, "Thomas Petazzoni" <thomas.petazzoni at free-electrons.com>
> Betreff: Re: [RFC v2] linux: add fbtft kernel extension
>
> Peter, All,
> 
> On 2014-12-30 20:58 +0100, Peter Seiderer spake thusly:
> > ... sorry for the resend, file linux/linux-ext-fbtft.mk was missing.
> 
> No problem, I've marked the first iteration as "Syuperseded" in our
> Patchwork.
> 
> > First draft of a patch adding fbtft framebuffer drivers to buildroot.
> 
> Thanks! :-)
> 
> > My first attempt was using the out of tree kernel modules compile
> > (as suggested by Yann E. MORIN [1]) which is already (partly)
> > supported by the fbtft source, but I failed to enable some
> > needed kernel configurations e.g FB_DEFERRED_IO (did not survive
> > the oldconfig/silentoldconfig step when not referenced in tree,
> > workaround is to enable a built in feature with the same
> > preferences [2]).
> 
> OK, I'll be looking at it, to see why it fails. Don't expect much before
> next week-end (actually, that will be next year, too! :-) ) because,
> well, New Year celebrations, boring stuff like that, which I'm socially
> obliged to attend... ;-)
> 

...as a little help my patch file for the first attempt (after the duplication
of the KCONFIG_ENABLE_OPT calls after the call to oldconfig I gave up and tried the
second approach)...

Regards,
Peter

> Regards,
> Yann E. MORIN.
> 
> > The second attempt is the linux-ext approach (as presented here).
> > 
> > I am unsure if the enabling of CONFIG_SPI_BCM2708 belongs into
> > linux.mk or should go into raspberrypi_defconfig or belongs into
> > the appropriate Readme?
> > 
> > The second question is about the 25 submodules of fbtft
> > (at the moment only FB_TFT_ILI9340 and FB_TFT_ILI9341 are
> > enabled). Should every submodule be configurable or should all
> > submodules be enabled by default?
> > 
> > There is an adafruit fork of the fbtft repository [4] with some
> > adfruit specific enhancements...
> > 
> > Regards,
> > Peter
> > 
> > Tested with RaspberryPi B+ and PiTFT Mini Kit - 320x240 2.8" TFT
> > (see [5] and [6]) and the following configuration changes:
> > 
> > - cmdline.txt: add 'fbcon=map:10 fbcon=font:VGA8x8'
> > - add /etc/modules-load.d/fbtft.conf with 'fbtft_device'
> > - add /etc/modprobe.d/00-fbtft.conf with 'options fbtft_device name=adafruit28 rotate=90 gpios=dc:25'
> > 
> > [1] http://lists.busybox.net/pipermail/buildroot/2014-December/115770.html
> > [2] https://github.com/notro/fbtft/issues/209#issuecomment-68191514
> > [3] http://www.adafruit.com/products/1983
> > [4] https://github.com/adafruit/adafruit-rpi-fbtft
> > [5] http://h65951.serverkompetenz.net/PeterSeiderer/upload/PiTFT_2_8_ct/Image9893.jpg
> > [6] http://h65951.serverkompetenz.net/PeterSeiderer/upload/PiTFT_2_8_ct/Image9897.jpg
> > 
> > Peter Seiderer (1):
> >   linux: add fbtft kernel extension
> > 
> >  linux/Config.ext.in      | 10 ++++++++++
> >  linux/linux-ext-fbtft.mk | 25 +++++++++++++++++++++++++
> >  linux/linux.mk           |  9 +++++++++
> >  package/Config.in        |  1 +
> >  package/fbtft/Config.in  | 13 +++++++++++++
> >  package/fbtft/fbtft.mk   | 11 +++++++++++
> >  6 files changed, 69 insertions(+)
> >  create mode 100644 linux/linux-ext-fbtft.mk
> >  create mode 100644 package/fbtft/Config.in
> >  create mode 100644 package/fbtft/fbtft.mk
> > 
> > -- 
> > 2.1.2
> > 
> 
> -- 
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