Test similar building process, add " pciutils bridge-utils" in the ~/flexbuild_lsdk2108_github/configs/yocto/local_arm64_tiny.conf
IMAGE_INSTALL_append = " sudo file parted curl openssh-scp openssh-ssh openssh-sshd \
e2fsprogs dosfstools bash coreutils diffutils util-linux \
net-tools sysvinit libtool libstdc++ libstdc++-dev libxml2 \
libnl-genl pciutils bridge-utils"
$ flex-builder -i clean-rfs -r yocto
$ flex-builder -i mkrfs -r yocto:tiny
All commands work well.