@drewmoseley
I tried the suggested local.conf changes. I had an error building:
/home/yocto/nano/var-fsl-yocto/build_xwayland/tmp/work/imx8mn_var_som-poky-linux/fsl-image-qt5/1.0-r0/bootfs.image_sdimg/*: No such file or directory
Based on https://hub.mender.io/t/yocto-warrior-build-failing-on-do-image-sdimg-for-beaglebone/1706, I tried adding this to the end of local.conf:
IMAGE_BOOT_FILES = "u-boot.bin"
This solved the build problem, but when I booted the image I got “Bad Linux ARM64 Image Magic!”.