RaspberryPi3- EGLFS : Could not find DRM device

[Raviphulsundar]

$export QT_QPA_PLATFORM=eglfs
$export QT_QPA_EGLFS_ALWAYS_SET_MODE=1
$export QT_LOGGING_RULES=qt.qpa.*=true
$./Program -platform eglfs
qt.qpa.egldeviceintegration: EGL device integration plugin keys: ("eglfs_kms_egldevice","eglfs_kms","eglfs_X11")
qt.qpa.egldeviceintegration: EGL device integration plugin keys (sorted): ("eglfs_kms","eglfs_kms_egldevice","eglfs_X11")
qt.qpa.egldeviceintegration: Trying to load device EGL integration "eglfs_kms"
qt.qpa.egldeviceintegration: Using EGL device integrtion "eglfs_kms"
qt.qpa.input: udev device discovery for type QFlags(0x10)
qt.qpa.input: Found matching devices ()
qt.qpa.eglfs.kms: Found the following video devices ()
Could not find DRM device!
Aborted

There is no /dev/dri directory on traget neither /sys/class/drm
Is this pbm with udev or something else ?

with lsmod found that no drm module is inserted
however /lib/modules/kernel/drivers/gpu/drm.ko is available.

but even after inserting no improvement.