Hey Remi,

I believe you solved this issue since you already posted this article in 
the wiki:

https://elinux.org/BeagleBoneBlack/SGX_%2B_Qt_EGLFS_%2B_Weston

I used your article to enable EGLFS support for Qt on my BeagleBone Black. 
Many thanks for the clear and detailed article!

Best regards
Bora

On Thursday, March 28, 2019 at 7:47:49 PM UTC+1, [email protected] wrote:
>
> So kernel "overlays" are broken, upgrade your version of u-boot and
>>
>> add this define in /boot/uEnv.txt
>>
>> sudo /opt/scripts/tools/developers/update_bootloader.sh
>>
>> enable_uboot_overlays=1
>> uboot_overlay_addr4=/lib/firmware/CAPE-LVDS-1024-00A0.dtbo
>> disable_uboot_overlay_video=1
>>
>> Then reboot and run:
>>
>> sudo /opt/scripts/tools/version.sh
>>
>> to see if everything is happy..
>>
>>
> Ok perfect, that work very fine! Thanks
>
>
> That is strange, i never had libgbm-dev installed and got kmscube to work..
>
> When I execute 'autogen.sh', the script notice me to get libgbm-dev:
>
> git clone git://git.ti.com/glsdk/kmscube.git
>
> cd kmscube/
>
> ./autogen.sh
> ...
> checking for DRM... yes
> checking for GBM... no
> configure: error: Package requirements (gbm) were not met:
>
> No package 'gbm' found
>
> Consider adjusting the PKG_CONFIG_PATH environment variable if you
> installed software in a non-standard prefix.
>
> Alternatively, you may set the environment variables GBM_CFLAGS
> and GBM_LIBS to avoid the need to call pkg-config.
> See the pkg-config man page for more details.
>
>
>  
> But it's very strange, because if I do just: apt remove libgbm1 --purge
> I can execute normaly kmscube but I have a black screen.
> root@beaglebone ~ # ll /usr/lib/libgb*
> lrwxrwxrwx 1 root root   15 Mar 26 18:40 /usr/lib/libgbm.so -> 
> libgbm.so.2.0.0
> lrwxrwxrwx 1 root root   15 Mar 26 18:40 /usr/lib/libgbm.so.2 -> 
> libgbm.so.2.0.0
> -rw-r--r-- 1 root root 9.5K Mar 26 18:40 /usr/lib/libgbm.so.2.0.0
> root@beaglebone ~ # whereis kmscube
> kmscube: /usr/bin/kmscube
> root@beaglebone ~ # ldd /usr/bin/kmscube
>         linux-vdso.so.1 (0xbeff6000)
>         libm.so.6 => /lib/arm-linux-gnueabihf/libm.so.6 (0xb6f27000)
>         libdrm.so.2 => /usr/lib/arm-linux-gnueabihf/libdrm.so.2 
> (0xb6f0b000)
>         libgbm.so.2 => /usr/lib/libgbm.so.2 (0xb6ef8000)
>         libdl.so.2 => /lib/arm-linux-gnueabihf/libdl.so.2 (0xb6ee5000)
>         libEGL.so.1 => /usr/lib/libEGL.so.1 (0xb6ed3000)
>         libIMGegl.so.1 => /usr/lib/libIMGegl.so.1 (0xb6eae000)
>         libdrm_omap.so.1 => /usr/lib/arm-linux-gnueabihf/libdrm_omap.so.1 
> (0xb6e9b000)
>         libGLESv2.so.2 => /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2 
> (0xb6e7d000)
>         libsrv_um.so.1 => /usr/lib/libsrv_um.so.1 (0xb6e46000)
>         libc.so.6 => /lib/arm-linux-gnueabihf/libc.so.6 (0xb6d58000)
>         /lib/ld-linux-armhf.so.3 (0xb6fc3000)
>         libudev.so.1 => /lib/arm-linux-gnueabihf/libudev.so.1 (0xb6d41000)
>         libwayland-server.so.0 => 
> /usr/lib/arm-linux-gnueabihf/libwayland-server.so.0 (0xb6d26000)
>         libffi.so.6 => /usr/lib/arm-linux-gnueabihf/libffi.so.6 
> (0xb6d10000)
>         libdbm.so.1 => /usr/lib/libdbm.so.1 (0xb6cfe000)
>         libpthread.so.0 => /lib/arm-linux-gnueabihf/libpthread.so.0 
> (0xb6cda000)
>         libGLdispatch.so.0 => 
> /usr/lib/arm-linux-gnueabihf/libGLdispatch.so.0 (0xb6c5c000)
>         librt.so.1 => /lib/arm-linux-gnueabihf/librt.so.1 (0xb6c46000)
>         libgcc_s.so.1 => /lib/arm-linux-gnueabihf/libgcc_s.so.1 
> (0xb6c1d000)
> After the command "apt autoremove", the kmscube is displayed correctly on 
> the screen!
>
>  
>
> Unfortunately, if we use we ti-sgx-common-ddk-um package's, we will have 
>> conflicts with libegl1-mesa-dev and libgles2-mesa-dev packages and the 
>> libgbm1 package will be reinstall... 
>
> Ah crap, so the reason i split those files into a 2nd common package
>> was to fix that possibility..
>>
>> Fixed with: 
>> https://github.com/rcn-ee/repos/commit/25a4d0892b99a0526adc683f0f34b767cb6b193e
>>
>>
>  Ok I try this :
> root@beaglebone ~ # dpkg -l |grep ti-sgx
> ii  ti-sgx-ti335x-modules-4.14.108-ti-r101  1stretch                      
>                                                            armhf        
> ti-sgx modules
> ii  ti-sgx-ti33x-ddk-um                                
> 1.14.3699939-git20171201.0-0*rcnee9*~stretch+20190328  armhf        
> Userspace libraries for SGX
> ii  ti-sgx-common-ddk-um                          
> 1.14.3699939-git20171201.0-0rcnee8~stretch+20190326   armhf        
> Userspace libraries for SGX
>
> root@beaglebone ~ # apt install libqt5qml5 qml-module-qtquick-controls 
> qt5-default qtdeclarative5-dev qtquickcontrols5-examples
> Reading package lists... Done
> Building dependency tree
> Reading state information... Done
> The following additional packages will be installed:
>   libdrm-amdgpu1 libdrm-common libdrm-dev libdrm-etnaviv1 libdrm-exynos1 
> libdrm-freedreno1 libdrm-nouveau2 libdrm-omap1 libdrm-radeon1 libdrm-tegra0 
> libdrm2 libegl-mesa0 libegl1 libegl1-mesa *libegl1-mesa-dev* libevdev2 
> *libgbm1 
> *libgles2  *libgles2-mesa-dev* ...
> Errors were encountered while processing:
>
>  
> /tmp/apt-dpkg-install-e1Iuir/076-libegl1-mesa-dev_18.1.9-1rcnee1~stretch+20190321_armhf.deb
>
>  
> /tmp/apt-dpkg-install-e1Iuir/077-libgles2-mesa-dev_18.1.9-1rcnee1~stretch+20190321_armhf.deb
> E: Sub-process /usr/bin/dpkg returned an error code (1)
>
> So I remove manually:
> # dpkg -r  ti-sgx-common-ddk-um
> # apt --fix-broken install
>
> Ok, there is no error now with apt command.
> I execute the Qt example:
> ./dashboard
> Could not initialize egl display
> Aborted
> Thin I really need the ti-sgx-common-ddk-um package and not 
> libegl1-mesa-dev/libgles2-mesa-dev!
> This is not the way to go I guess.
>
>
> It's certainly a silly question but.. Why do not you update directly the 
> libraries mesa-libgl1, mesa-libgles2 and libgbm?
>
>
>
> Le jeudi 28 mars 2019 16:33:51 UTC+1, RobertCNelson a écrit :
>>
>> On Thu, Mar 28, 2019 at 9:59 AM <[email protected]> wrote: 
>> > 
>> > Hi Robert, 
>> > 
>> > I test your script with kmscube, qt5 qml and with my custom cape with 
>> dts file (available on attached file). 
>> > I share with you all my results (sorry it's a long post...) 
>> > 
>> > Commands execute on start 
>> > #uname -r 
>> > 4.9.78-ti-r94 
>> > #apt update 
>> > #cd /opt/scripts/tools/ 
>> > #git pull 
>> > #./update_kernel.sh --ti-channel --lts-4_14 --sgx 
>> > ... 
>> > The following NEW packages will be installed: 
>> >   linux-image-4.14.108-ti-r101 
>> > ... 
>> > The following NEW packages will be installed: 
>> >   libpruio-modules-4.14.108-ti-r101 
>> > ... 
>> > The following NEW packages will be installed: 
>> >   ti-sgx-ti335x-modules-4.14.108-ti-r101 
>> > ... 
>> > The following NEW packages will be installed: 
>> >   ti-libgbm2 ti-sgx-ti33x-ddk-um 
>> > ... 
>> > #reboot 
>> > #uname -r 
>> > 4.14.108-ti-r101 
>> > 
>> > 
>> > 
>> > 
>> > With HDMI and KMSCUBE 
>> > root@beaglebone ~ #ls /sys/devices/platform/ocp/56000000.sgx 
>> > ls: cannot access '/sys/devices/platform/ocp/56000000.sgx': No such 
>> file or directory 
>> > root@beaglebone ~ # /etc/init.d/ti-sgx-ti33x-ddk-um start 
>> > [ ok ] Starting ti-sgx-ti33x-ddk-um (via systemctl): 
>> ti-sgx-ti33x-ddk-um.service. 
>> > root@beaglebone ~ # dmesg |grep -i pvr 
>> > [  317.740779] pvrsrvkm: loading out-of-tree module taints kernel. 
>> > root@beaglebone ~ # service ti-sgx-ti33x-ddk-um status 
>> > ● ti-sgx-ti33x-ddk-um.service - LSB: Start daemon at boot time 
>> >    Loaded: loaded (/etc/init.d/ti-sgx-ti33x-ddk-um; generated; vendor 
>> preset: enabled) 
>> >    Active: active (exited) since Thu 2019-03-28 14:27:45 CET; 9min ago 
>> >      Docs: man:systemd-sysv-generator(8) 
>> >   Process: 314 ExecStart=/etc/init.d/ti-sgx-ti33x-ddk-um start 
>> (code=exited, status=0/SUCCESS) 
>> >     Tasks: 0 (limit: 4915) 
>> >    CGroup: /system.slice/ti-sgx-ti33x-ddk-um.service 
>> > 
>> > Mar 28 14:27:42 beaglebone systemd[1]: Starting LSB: Start daemon at 
>> boot time... 
>> > Mar 28 14:27:45 beaglebone systemd[1]: Started LSB: Start daemon at 
>> boot time. 
>> > 
>> > 
>> > hum I haven't access to sgx drivers. I check my uEnv.txt file, and I 
>> comment "dtb=am335x-boneblack-overlay.dtb" line (why I have this line? 
>> idk..) 
>> > ls /sys/devices/platform/ocp/56000000.sgx 
>> > driver  driver_override  drm  modalias  of_node  power  subsystem 
>>  uevent 
>> > dmesg |grep -i pvr 
>> > [   12.544964] pvrsrvkm: loading out-of-tree module taints kernel. 
>> > [   12.754997] [drm] Initialized pvr 1.14.3699939 20110701 for 
>> 56000000.sgx on minor 2 
>> > [   12.939720] PVR_K: UM DDK-(3699939) and KM DDK-(3699939) match. [ OK 
>> ] 
>> > 
>> > Ok good! Your /etc/init.d/ti-sgx-ti33x-ddk-um script work fine now. 
>> > 
>> > So to really test the SGX drivers, I run OGLES2Water from git://
>> git.ti.com/graphics/img-pvr-sdk.git and it execute fine! Perfect! 
>> > 
>> > I did not find a package with kms++ or kmscube, so I took my package 
>> directly. 
>> > root@beaglebone /opt # wget 
>> https://remi.avignon.me/bbb/kmsxx_1.0.0_armhf.deb 
>> > root@beaglebone /opt # dpkg -i kmsxx_1.0.0_armhf.deb 
>> > root@beaglebone /opt # kmscube 
>> > drmModeGetResources failed: Invalid argument 
>> > failed to initialize DRM 
>> > 
>> > root@beaglebone /opt # ls -alh /sys/class/drm/ 
>> > total 0 
>> > drwxr-xr-x  2 root root    0 Mar 28 15:01 . 
>> > drwxr-xr-x 63 root root    0 Mar 28 14:52 .. 
>> > lrwxrwxrwx  1 root root    0 Mar 28 14:52 card0 -> 
>> ../../devices/platform/vgem/drm/card0 
>> > lrwxrwxrwx  1 root root    0 Mar 28 14:52 card1 -> 
>> ../../devices/platform/ocp/4830e000.lcdc/drm/card1 
>> > lrwxrwxrwx  1 root root    0 Mar 28 14:52 card1-HDMI-A-1 -> 
>> ../../devices/platform/ocp/4830e000.lcdc/drm/card1/card1-HDMI-A-1 
>> > lrwxrwxrwx  1 root root    0 Mar 28 14:53 card2 -> 
>> ../../devices/platform/ocp/56000000.sgx/drm/card2 
>> > lrwxrwxrwx  1 root root    0 Mar 28 14:53 renderD128 -> 
>> ../../devices/platform/ocp/56000000.sgx/drm/renderD128 
>> > -r--r--r--  1 root root 4.0K Mar 28 14:52 version 
>> > 
>> > root@beaglebone /opt # kmscube -d /dev/dri/card1 
>> > ### Display [0]: CRTC = 28, Connector = 30, format = 0x36314752 
>> >         Mode chosen [1024x768] : Clock => 78750, Vertical refresh => 
>> 75, Type => 64 
>> >         Horizontal => 1024, 1040, 1136, 1312, 0 
>> >         Vertical => 768, 769, 772, 800, 0 
>> > ### Primary display => ConnectorId = 30, Resolution = 1024x768 
>> > loaded module : gbm_pvr.so 
>> > found valid GBM backend : gbm_pvr.so 
>> > failed to initialize 
>> > failed to initialize EGL 
>> > 
>> > root@beaglebone /opt # apt remove libgbm-dev libgbm1 
>> > Reading package lists... Done 
>> > Building dependency tree 
>> > Reading state information... Done 
>> > Package 'libgbm-dev' is not installed, so not removed 
>> > The following packages were automatically installed and are no longer 
>> required: 
>> >   gconf-service gconf2 gconf2-common gksu keyboard-configuration 
>> libdbus-glib-1-2 libdrm-armada2 libetnaviv libevde 
>> >   libgksu2-0 libgles2 libgles2-mesa libgnome-keyring-common 
>> libgnome-keyring0 libgtop-2.0-10 libgtop2-common libinp 
>> >   libstartup-notification0 libutf8proc2 libwacom-bin libwacom-common 
>> libwacom2 libxcb-icccm4 libxcb-image0 libxcb-k 
>> >   libxkbcommon-x11-0 lxmenu-data oxygen-icon-theme pcmanfm-qt-l10n 
>> qterminal-l10n qtermwidget5-data xserver-xorg-le 
>> > Use 'apt autoremove' to remove them. 
>> > The following additional packages will be installed: 
>> >   libwayland-egl1 xserver-common 
>> > The following packages will be REMOVED: 
>> >   libegl-mesa0 libegl1 libegl1-mesa libfm-qt3 libgbm1 libqt5gui5 
>> libqt5multimedia5 libqt5multimediawidgets5 libqt5o 
>> >   pcmanfm-qt qt5-gtk-platformtheme qterminal xserver-xorg 
>> xserver-xorg-core xserver-xorg-input-all xserver-xorg-inp 
>> >   xserver-xorg-video-armada-etnaviv xserver-xorg-video-fbdev 
>> xserver-xorg-video-omap 
>> > The following NEW packages will be installed: 
>> >   libwayland-egl1 
>> > The following packages will be upgraded: 
>> >   xserver-common 
>> > 1 upgraded, 1 newly installed, 28 to remove and 188 not upgraded. 
>> > Need to get 2,067 kB of archives. 
>> > After this operation, 21.2 MB disk space will be freed. 
>> > Do you want to continue? [Y/n] y 
>> > 
>> > root@beaglebone /opt # kmscube -d /dev/dri/card1 
>> > ### Display [0]: CRTC = 28, Connector = 30, format = 0x36314752 
>> >         Mode chosen [1024x768] : Clock => 78750, Vertical refresh => 
>> 75, Type => 64 
>> >         Horizontal => 1024, 1040, 1136, 1312, 0 
>> >         Vertical => 768, 769, 772, 800, 0 
>> > ### Primary display => ConnectorId = 30, Resolution = 1024x768 
>> > loaded module : gbm_pvr.so 
>> > found valid GBM backend : gbm_pvr.so 
>> > Using display 0x1 with EGL version 1.4 
>> > EGL Version "1.4 build 1.14@3699939 (MAIN)" 
>> > EGL Vendor "Imagination Technologies" 
>> > EGL Extensions "EGL_IMG_client_api_ogl EGL_KHR_image EGL_KHR_image_base 
>> EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_cubemap_image 
>> EGL_KHR_gl_renderbuffer_image EGL_KHR_vg_parent_image EGL_IMG_cl_image 
>> EGL_KHR_fence_sync EGL_IMG_context_priority EGL_IMG_hibernate_process 
>> EGL_IMG_image_plane_attribs EGL_KHR_surfaceless_context EGL_KHR_wait_sync 
>> EGL_KHR_create_context EGL_WL_bind_wayland_display 
>> EGL_EXT_image_dma_buf_import" 
>> > 
>> > 
>> > But on my HDMI monitor I don't see a 3D cube but just a verticals blue 
>> lines!! It's strange... 
>> > I recompile kmscube but I need libgbm-dev package ^^'... 
>>
>> That is strange, i never had libgbm-dev installed and got kmscube to 
>> work.. 
>>
>>
>> > root@beaglebone /opt/kmscube # apt autoremove 
>> > Reading package lists... Done 
>> > Building dependency tree 
>> > Reading state information... Done 
>> > The following packages will be REMOVED: 
>> >   gconf-service gconf2 gconf2-common gksu keyboard-configuration 
>> libdbus-glib-1-2 libdrm-armada2 libetnaviv 
>> >   libevdev2 libfm-data libfm-extra4 libfm-gtk-data libfm-gtk4 
>> libfm-modules libfm-qt-l10n libfm4 libgbm1 
>> >   libgconf-2-4 libgksu2-0 libgles2 libgles2-mesa 
>> libgnome-keyring-common libgnome-keyring0 libgtop-2.0-10 
>> >   libgtop2-common libinput-bin libinput10 libmenu-cache-bin 
>> libmenu-cache3 libmtdev1 libpciaccess0 libqt5dbus5 
>> >   libqt5network5 libstartup-notification0 libutf8proc2 libwacom-bin 
>> libwacom-common libwacom2 libxcb-icccm4 
>> >   libxcb-image0 libxcb-keysyms1 libxcb-randr0 libxcb-render-util0 
>> libxcb-util0 libxcb-xinerama0 libxcb-xkb1 
>> >   libxfont2 libxkbcommon-x11-0 lxmenu-data oxygen-icon-theme 
>> pcmanfm-qt-l10n qterminal-l10n qtermwidget5-data 
>> >   xserver-xorg-legacy 
>> > 0 upgraded, 0 newly installed, 54 to remove and 182 not upgraded. 
>> > After this operation, 61.0 MB disk space will be freed. 
>> > Do you want to continue? [Y/n] y 
>> > ... 
>> > 
>> > root@beaglebone ~ # kmscube -d /dev/dri/card1 
>> > kmscube: error while loading shared libraries: libgbm.so.1: cannot open 
>> shared object file: No such file or directory 
>> > 
>> > root@beaglebone ~ # ln -s /usr/lib/libgbm.so.2.0.0 /usr/lib/libgbm.so.1 
>>
>> Wonder if i should just auto-create that symlink to... 
>>
>> > 
>> > root@beaglebone ~ # kmscube -d /dev/dri/card1 
>> > ### Display [0]: CRTC = 28, Connector = 30, format = 0x36314752 
>> >         Mode chosen [1024x768] : Clock => 78750, Vertical refresh => 
>> 75, Type => 64 
>> >         Horizontal => 1024, 1040, 1136, 1312, 0 
>> >         Vertical => 768, 769, 772, 800, 0 
>> > ### Primary display => ConnectorId = 30, Resolution = 1024x768 
>> > loaded module : gbm_pvr.so 
>> > found valid GBM backend : gbm_pvr.so 
>> > Using display 0x1 with EGL version 1.4 
>> > EGL Version "1.4 build 1.14@3699939 (MAIN)" 
>> > EGL Vendor "Imagination Technologies" 
>> > EGL Extensions "EGL_IMG_client_api_ogl EGL_KHR_image EGL_KHR_image_base 
>> EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_cubemap_image 
>> EGL_KHR_gl_renderbuffer_image EGL_KHR_vg_parent_image EGL_IMG_cl_image 
>> EGL_KHR_fence_sync EGL_IMG_context_priority EGL_IMG_hibernate_process 
>> EGL_IMG_image_plane_attribs EGL_KHR_surfaceless_context EGL_KHR_wait_sync 
>> EGL_KHR_create_context EGL_WL_bind_wayland_display 
>> EGL_EXT_image_dma_buf_import" 
>> > ^CHandling signal number = 2 
>> > Cleanup of GL, GBM and DRM completed 
>> > 
>> > Yeah now I can see the 3D cube in rotation! 
>> > 
>> > 
>> > 
>> > With HMDI and Qt QML with EGLFS 
>> > Unfortunately, if we use we  ti-sgx-common-ddk-um package's, we will 
>> have conflicts with libegl1-mesa-dev and libgles2-mesa-dev packages and the 
>> libgbm1 package will be reinstall... 
>> > 
>> > #apt install libqt5qml5 qml-module-qtquick-controls qt5-default 
>> qtdeclarative5-dev qtquickcontrols5-examples 
>> > ... 
>> > dpkg: error processing archive 
>> /tmp/apt-dpkg-install-CHuAeE/57-libegl1-mesa-dev_18.1.9-1rcnee1~stretch+20190321_armhf.deb
>>  
>> (--unpack): 
>> >  trying to overwrite '/usr/include/EGL/egl.h', which is also in package 
>> ti-sgx-common-ddk-um 1.14.3699939-git20171201.0-0rcnee8~stretch+20190326 
>> > Selecting previously unselected package libgles2-mesa-dev:armhf. 
>> > Preparing to unpack 
>> .../58-libgles2-mesa-dev_18.1.9-1rcnee1~stretch+20190321_armhf.deb ... 
>> > Unpacking libgles2-mesa-dev:armhf (18.1.9-1rcnee1~stretch+20190321) ... 
>> > dpkg: error processing archive 
>> /tmp/apt-dpkg-install-CHuAeE/58-libgles2-mesa-dev_18.1.9-1rcnee1~stretch+20190321_armhf.deb
>>  
>> (--unpack): 
>> >  trying to overwrite '/usr/include/GLES2/gl2.h', which is also in 
>> package ti-sgx-common-ddk-um 
>> 1.14.3699939-git20171201.0-0rcnee8~stretch+20190326 
>> > dpkg-deb: error: subprocess paste was killed by signal (Broken pipe) 
>>
>> Ah crap, so the reason i split those files into a 2nd common package 
>> was to fix that possibility.. 
>>
>> Fixed with: 
>> https://github.com/rcn-ee/repos/commit/25a4d0892b99a0526adc683f0f34b767cb6b193e
>>  
>>
>> > ... 
>> > You might want to run 'apt --fix-broken install' to correct these. 
>> > The following packages have unmet dependencies: 
>> >  qtbase5-dev : Depends: libgles2-mesa-dev but it is not going to be 
>> installed or 
>> >                         libgles2-dev but it is not installable 
>> > E: Unmet dependencies. Try 'apt --fix-broken install' with no packages 
>> (or specify a solution). 
>> > 
>> > $sudo apt --fix-broken install 
>> > Reading package lists... Done 
>> > Building dependency tree 
>> > Reading state information... Done 
>> > Correcting dependencies... Done 
>> > The following additional packages will be installed: 
>> >   libegl1-mesa-dev libgles2-mesa-dev 
>> > The following NEW packages will be installed: 
>> >   libegl1-mesa-dev libgles2-mesa-dev 
>> > 0 upgraded, 2 newly installed, 0 to remove and 175 not upgraded. 
>> > 78 not fully installed or removed. 
>> > Need to get 140 kB of archives. 
>> > After this operation, 811 kB of additional disk space will be used. 
>> > Do you want to continue? [Y/n] y 
>> > Get:1 http://repos.rcn-ee.com/debian stretch/main armhf 
>> libegl1-mesa-dev armhf 18.1.9-1rcnee1~stretch+20190321 [59.7 kB] 
>> > Get:2 http://repos.rcn-ee.com/debian stretch/main armhf 
>> libgles2-mesa-dev armhf 18.1.9-1rcnee1~stretch+20190321 [80.7 kB] 
>> > Fetched 140 kB in 0s (174 kB/s) 
>> > E: Sub-process /usr/bin/dpkg returned an error code (1) 
>> > 
>> > 
>> > But it's not a problem to compile and execute a Qt program : 
>> > cd 
>> /usr/lib/arm-linux-gnueabihf/qt5/examples/quickcontrols/extras/dashboard 
>> > qmake 
>> > make 
>> > export QT_QPA_PLATFORM=eglfs 
>> > export QT_QPA_EGLFS_INTEGRATION=none 
>> > ./dashboard 
>> > 
>> > Okay we can see the dashboard program on the monitor! 
>> > 
>> > 
>> > LVDS with my custom cape 
>> > 
>> > My custom cape work fine on 4.9 kernel. I can compile my dts file to 
>> dtbo on 4.14 but I have a "Unable to handle kernel NULL pointer dereference 
>> at virtual address" error on boot. 
>> > $sudo dtc -O dtb -o /lib/firmware/CAPE-LVDS-1024-00A0.dtbo -b 0 -@ 
>> CAPE-LVDS-1024-00A0.dts 
>> > $sudo echo 'CAPE=CAPE-LVDS-1024' > /etc/default/capemgr 
>> > $sudo reboot 
>>
>> So kernel "overlays" are broken, upgrade your version of u-boot and 
>> add this define in /boot/uEnv.txt 
>>
>> sudo /opt/scripts/tools/developers/update_bootloader.sh 
>>
>> enable_uboot_overlays=1 
>> uboot_overlay_addr4=/lib/firmware/CAPE-LVDS-1024-00A0.dtbo 
>> disable_uboot_overlay_video=1 
>>
>> Then reboot and run: 
>>
>> sudo /opt/scripts/tools/version.sh 
>>
>> to see if everything is happy.. 
>>
>> > My dts file dates from the old school, I created it for the first 
>> debian version (3.8.13-bone50) and I adapted it for kernel 4.4 and 4.9. 
>> > I think I have to use the new way for kernel 1.14. This problem has 
>> nothing to do with SGX. 
>> > 
>> > I hope that my tests will be useful to you to continue the integration 
>> of the libraries to use the graphic acceleration. 
>>
>> Regards, 
>>
>> -- 
>> Robert Nelson 
>> https://rcn-ee.com/ 
>>
>

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