Some more information:
Build Configuration:
BB_VERSION= "1.46.0"
BUILD_SYS= "x86_64-linux"
NATIVELSBSTRING= "universal"
TARGET_SYS= "x86_64-poky-linux"
MACHINE= "virtualbox"
DISTRO= "my-gnu-linux"
DISTRO_VERSION= "3.1.2"
TUNE_FEATURES= "m64"
TARGET_FPU= ""
Without any ajustments in my .conf file I get the missing WKS_FILE/S warning:
ERROR: my-image-1.0-r0 do_image_wic: No kickstart files from WKS_FILES were found: my-image.virtualbox.wks my-image.wks. Please set WKS_FILE or WKS_FILES appropriately.
*** hddimg/vdmk ***
Setting IMAGE_FSTYPES = "hddimg"
Convert the generated hddimg to vdmk :
$ vboxmanage convertfromraw image-virtualbox.hddimg image-virtualbox.vdmk
Starting image-virtualbox.vdmk with VirtualBox:
Starting image-virtualbox.hdd with VirtualBox shows the same behaviour as for vdmk
Opening the vdmk file as an archive the files show strange creation dates:

*** iso ***
Setting IMAGE_FSTYPES = "iso"
Starting image-virtualbox.iso with VirtualBox:
Linux is booting until it hangs after "Load/Save Random Seed". What stands out is the failure message in the beginning "Failed to start Remount Root and Kernel File Systems"... But how to fix it?

