This issue had been fixed by downloading firmware with flow control.
1. Build project $ /lpg-build/cdc/fast_prod/WRLINUX_MASTER_WR/MASTER_WR_GIT/wrlinux-10/setup.sh --machines=bcm-2xxx-rpi4 --templates feature/test feature/linux-yocto-dev feature/userspace-next feature/toolchain-next --accept-eula=yes --dl-layers $ source environment-setup-x86_64-wrlinuxsdk-linux $ source oe-init-build-env build $ bitbake-layers add-layer /lpg-build/cdc/WASSP_LINUX_MASTER_WR/testcases/wrlinux/wr-testing/bts-dev >> conf/local.conf $ bitbake wrlinux-image-std 2. Load image to the SD card on the target (rpi4 with 8GB memory) and boot it up 3. Run the following commands root@bcm-2xxx-rpi4:~# cd /lib/firmware/brcm/ root@bcm-2xxx-rpi4:~# wget https://github.com/RPi-Distro/bluez-firmware/raw/master/broadcom/BCM4345C0.hcd root@bcm-2xxx-rpi4:~# reboot root@bcm-2xxx-rpi4:~# hciattach /dev/ttyAMA0 bcm43xx 921600 noflow -
