[Buildroot] Requirements for QML in RPi4

Peter Seiderer ps.report at gmx.net
Tue Feb 4 14:57:15 UTC 2020


Hello Andrea,

On Tue, 28 Jan 2020 08:38:24 +0100, Peter Seiderer <ps.report at gmx.net> wrote:

> Hello Andrea,
>
> please keep buildroot at busybox.net on CC
>
> On Mon, 27 Jan 2020 21:11:21 +0100, Andrea Simeoni <andreasimeoni73 at gmail.com> wrote:
>
> > I rebuilt the image with the attached config file.
> > Now I don't get the error about DRM but... nothing happens. I run a QML
> > application (the default example) but on the screen I can still read the
> > console output.
>
> Thats bad....and sorry no more help from my side as I have not (yet) an
> RPi4 hardware to test myself ;-)

Update on this one, successful RPi4 64bit with Qt/Qml application run
using the following patches and 'dtoverlay=vc4-fkms-v3d',
see [1], [2], [3]...

Regards,
Peter

[1] http://lists.busybox.net/pipermail/buildroot/2020-February/273163.html
[2] https://patchwork.ozlabs.org/patch/1233373
[3] https://patchwork.ozlabs.org/patch/1233372

>
> Regards,
> Peter
>
> >
> > Here the modules loaded:
> >
> > # lsmod
> > Module                  Size  Used by
> > evdev                  24576  1
> > joydev                 20480  0
> > brcmfmac              315392  0
> > brcmutil               16384  1 brcmfmac
> > sha256_generic         20480  0
> > bcm2835_codec          36864  0
> > bcm2835_v4l2           45056  0
> > v4l2_mem2mem           24576  1 bcm2835_codec
> > cfg80211              610304  1 brcmfmac
> > bcm2835_mmal_vchiq     32768  2 bcm2835_codec,bcm2835_v4l2
> > raspberrypi_hwmon      16384  0
> > hwmon                  16384  1 raspberrypi_hwmon
> > videobuf2_dma_contig    20480  1 bcm2835_codec
> > rfkill                 28672  1 cfg80211
> > v4l2_common            16384  1 bcm2835_v4l2
> > videobuf2_vmalloc      16384  1 bcm2835_v4l2
> > videobuf2_memops       16384  2 videobuf2_dma_contig,videobuf2_vmalloc
> > videobuf2_v4l2         24576  3 bcm2835_codec,bcm2835_v4l2,v4l2_mem2mem
> > videobuf2_common       45056  4
> > bcm2835_codec,bcm2835_v4l2,v4l2_mem2mem,videobuf2_v4l2
> > videodev              200704  6
> > bcm2835_codec,v4l2_common,videobuf2_common,bcm2835_v4l2,v4l2_mem2mem,videobuf2_v4l2
> > media                  36864  3 bcm2835_codec,videodev,v4l2_mem2mem
> > vc_sm_cma              36864  1 bcm2835_mmal_vchiq
> > rpivid_mem             16384  0
> > fixed                  16384  0
> > rpi_ft5406             16384  0
> > rpi_backlight          16384  0
> > uio_pdrv_genirq        16384  0
> > uio                    20480  1 uio_pdrv_genirq
> > sch_fq_codel           20480  6
> > ipv6                  458752  24
> >
> >
> > Il giorno lun 27 gen 2020 alle ore 17:38 Andrea Simeoni <
> > andreasimeoni73 at gmail.com> ha scritto:
> >
> > >
> > > You seem to have a RPi4-64bit config, trying to run
> > >> mesa vc4?
> > >>
> > >
> > > IIRC it was needed to get accelerated GPU.
> > >
> > >
> > >
> > >> dtoverlay=vc4-fkms-v3d
> > >>
> > >
> > > Unfortunately it doesn't work. I read the links, and the situation seems a
> > > bit confusing.
> > >
> > >
> > > Alternatively your can try RPi4-32bit and enable
> > >> rpi-userland/BR2_PACKAGE_RPI_USERLAND
> > >> instead of mesa...
> > >>
> > >
> > > I don't need 64-bit but I need QML+GPU. I'm going to try RPi4+32bit w/
> > > userland.
> > > I hope it will works! I will report the results.
> > >
> > >
>
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