wzkiro@rockpi-4bplus:~$ dmesg | grep brcm
[ 7.069061] brcmfmac: F1 signature read @0x18000000=0x15294345
[ 7.108688] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43456-sdio for chip BCM4345/9
[ 7.109142] usbcore: registered new interface driver brcmfmac
[ 7.236547] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43456-sdio for chip BCM4345/9
[ 7.245940] brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM4345/9 wl0: Feb 11 2020 11:54:51 version 7.45.96.61 (be7af2d@shgit) (r745790) FWID 01-a41d86bd es7.c5.n4.a3
wzkiro@rockpi-4bplus:~$ dmesg | grep Bluetooth
[ 7.089775] Bluetooth: Core ver 2.22
[ 7.089894] Bluetooth: HCI device and connection manager initialized
[ 7.089914] Bluetooth: HCI socket layer initialized
[ 7.089922] Bluetooth: L2CAP socket layer initialized
[ 7.089943] Bluetooth: SCO socket layer initialized
[ 7.394043] Bluetooth: HCI UART driver ver 2.3
[ 7.394074] Bluetooth: HCI UART protocol H4 registered
[ 7.394081] Bluetooth: HCI UART protocol BCSP registered
[ 7.403820] Bluetooth: HCI UART protocol LL registered
[ 7.403831] Bluetooth: HCI UART protocol ATH3K registered
[ 7.405384] Bluetooth: HCI UART protocol Three-wire (H5) registered
[ 7.416771] Bluetooth: HCI UART protocol Intel registered
[ 7.440646] Bluetooth: HCI UART protocol Broadcom registered
[ 7.453388] Bluetooth: HCI UART protocol QCA registered
[ 7.453410] Bluetooth: HCI UART protocol AG6XX registered
[ 7.459664] Bluetooth: HCI UART protocol Marvell registered
[ 9.738700] Bluetooth: hci0: command 0xfc18 tx timeout
[ 13.642153] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 13.642193] Bluetooth: BNEP filters: protocol multicast
[ 13.642220] Bluetooth: BNEP socket layer initialized
[ 17.894543] Bluetooth: hci0: BCM: failed to write update baudrate (-110)
[ 17.894570] Bluetooth: hci0: Failed to set baudrate
[ 19.910475] Bluetooth: hci0: command 0x0c03 tx timeout
[ 28.484626] Bluetooth: hci0: BCM: Reset failed (-110)
Any ideas?