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BOOST-CC2564MODA: Can't init device with Ubuntu 20.04

Part Number: BOOST-CC2564MODA
Other Parts Discussed in Thread: CC2564C

Hi,

We are working on validating the HCI UART funtionality with BOOST-CC2564MODA Evaluation Board by using Linux as Host. We are able to attach the Module with Linux using btattach command, but while trying to make hci0 node up we get Device or Resource error. Please find the logs attached. 

Command used to attach

sudo btattach -B /dev/ttyUSB0

Logs when attaching the Module

[ 4144.853920] Bluetooth: HCI UART driver ver 2.3
[ 4144.853925] Bluetooth: HCI UART protocol H4 registered
[ 4144.853926] Bluetooth: HCI UART protocol BCSP registered
[ 4144.854016] Bluetooth: HCI UART protocol LL registered
[ 4144.854018] Bluetooth: HCI UART protocol ATH3K registered
[ 4144.854050] Bluetooth: HCI UART protocol Three-wire (H5) registered
[ 4144.854186] Bluetooth: HCI UART protocol Intel registered
[ 4144.854462] Bluetooth: HCI UART protocol Broadcom registered
[ 4144.854486] Bluetooth: HCI UART protocol QCA registered
[ 4144.854488] Bluetooth: HCI UART protocol AG6XX registered
[ 4144.854588] Bluetooth: HCI UART protocol Marvell registered

Bring up the module

$ sudo hciconfig hci0 up
Can't init device hci0: Device or resource busy (16)

dmesg when device or resource busy error occurs

[ 4227.635449] debugfs: File 'dut_mode' in directory 'hci0' already present!

1. Could you please point us on where we went wrong ?

2. In some forums we found that a different firmware has to be replaced into /lib/firmware/ti-connectivity/ folder, If so could you instruct How to proceed further ?