"Could not find DRM device" when trying to run Qt apps with EGLFS on Pi4

[jclsn]

Description
I have been trying to fix this for days now without success. I wanto run my application using eglfs, but I am getting the message Could not find DRM device!

My configuration is as follows

# Architecture of the host machine
SDKMACHINE ?= "x86_64"

# Extra packages

LICENSE_FLAGS_WHITELIST = "commercial"

IMAGE_INSTALL:remove = " \
  x11 \
  wayland \
"

IMAGE_INSTALL:append = " \
  coreutils \
  qtbase-examples \
  qtbase-plugins \
  qtbase-tools \
  qtdeclarative \
  qtdeclarative-plugins \
  qtdeclarative-qmlplugins \
  qtdeclarative-tools \
  qtimageformats-plugins \
  qtmultimedia \
  qtmultimedia-plugins \
  qtmultimedia-qmlplugins \
  qtquickcontrols2 \
  qtquicktimeline \
  qtscript \
  qtsvg \
  qtsvg-plugins \
  qtsystems \
  qtsystems-qmlplugins \
  qtsystems-tools \
  rsync \
"

PACKAGECONFIG:append:pn-qtbase = " \
  eglfs \
  gles2 \
  kms \
  "

# Image file system types to package
IMAGE_FSTYPES = "rpi-sdimg"

MACHINE ??= "raspberrypi4-64"
DISTRO ??= "poky"
BBMULTICONFIG ?= ""

Describe the results you received:
I cannot run my Qt application although Qt is configuring right according to this guide:

QPA backends:
  DirectFB ............................... no
  EGLFS .................................. yes
  EGLFS details:
    EGLFS OpenWFD ........................ no
    EGLFS i.Mx6 .......................... no
    EGLFS i.Mx6 Wayland .................. no
    EGLFS RCAR ........................... no
    EGLFS EGLDevice ...................... yes
    EGLFS GBM ............................ yes
    EGLFS VSP2 ........................... no
    EGLFS Mali ........................... no
    EGLFS Raspberry Pi ................... no
    EGLFS X11 ............................ yes

I had no problems on Raspbian. So I am thinking that there must be something wrong with my meta-raspberrypi setup. I would think that the qtbase-%.bbappend would take care of providing the right configuration for the Pi4.

PACKAGECONFIG_GL:rpi = "${@bb.utils.contains('DISTRO_FEATURES', 'x11 opengl', 'gl', \
                        bb.utils.contains('DISTRO_FEATURES',     'opengl', 'eglfs gles2', \
                                                                       '', d), d)}"
PACKAGECONFIG_GL:append:rpi = "${@bb.utils.contains('MACHINE_FEATURES', 'vc4graphics', ' kms', '', d)}"
PACKAGECONFIG_GL:append:rpi = " gbm"
PACKAGECONFIG_FONTS:rpi = "fontconfig"
PACKAGECONFIG:append:rpi = " libinput examples tslib xkbcommon"
PACKAGECONFIG:remove:rpi = "tests"

OE_QTBASE_EGLFS_DEVICE_INTEGRATION:rpi = "${@bb.utils.contains('MACHINE_FEATURES', 'vc4graphics', '', 'eglfs_brcm', d)}"

do_configure:prepend:rpi() {
    # Add the appropriate EGLFS_DEVICE_INTEGRATION
    if [ "${@d.getVar('OE_QTBASE_EGLFS_DEVICE_INTEGRATION')}" != "" ]; then
        echo "EGLFS_DEVICE_INTEGRATION = ${OE_QTBASE_EGLFS_DEVICE_INTEGRATION}" >> ${S}/mkspecs/oe-device-extra.pri
    fi
}
RDEPENDS:${PN}:append:rpi = "${@bb.utils.contains('MACHINE_FEATURES', 'vc4graphics', '', ' userland', d)}"
DEPENDS:append:rpi = "${@bb.utils.contains('MACHINE_FEATURES', 'vc4graphics', '', ' userland', d)}"

I have been playing around with a lot of values and have tried adding all of the above myself before finding this file, but am always coming to the same results.

[kraj]

I have it working well with Yoe Distro on rpi4-64

[jclsn]

@kraj I am using kas. Should the tool matter? In the docs also Kas is recommended

[kraj]

@kraj I am using kas. Should the tool matter? In the docs also Kas is recommended

it matters, if you see in meta-yoe
there are bunch of changes to make qt5 work with eglfs.

[jclsn]

Looks to me like only linuxfb was added if you compare it to the .bbappend from meta-raspberrypi

# This does not work when wayland and x11 both are enabled in DISTRO_FEATURES and x11 image
# is built but works ok for eglfs and wayland images
QT_CONFIG_FLAGS += "${@bb.utils.contains('DISTRO_FEATURES', 'wayland', '-qpa wayland', \
                                         bb.utils.contains('DISTRO_FEATURES', 'x11', '', \
                                                          '-qpa eglfs', d), d)}"

PACKAGECONFIG:append = " libinput eglfs examples linuxfb tslib"

PACKAGECONFIG_GL = "${@bb.utils.contains('DISTRO_FEATURES', 'x11 opengl', 'gl', \
                    bb.utils.contains('DISTRO_FEATURES',     'opengl', 'eglfs gles2', \
                                     '', d), d)}"

And shouldn't these changes be in meta-raspberry Pi then, if they fix it?

[jclsn]

@kraj I tried using the qtbase_%.bbappend from meta-yoe, but it did not change anything unfortunately

[jclsn]

Problem was that I had dtoverlay=vc4-kms-v3d and not dtoverlay=vc4-fkms-v3d set in the ``config.txt```...