Bluetooth HCI can't be found.

[zhoujustin]

We can't find the bluetooth device, and there havn't more details about the bluetooth.

[xieliwei]

You need to solder the four 0201 resistors to connect the BT HCI interface to UART1 as per the instruction here: https://wiki.sipeed.com/hardware/en/lichee/RV_Nano/2_unbox.html#LicheeRV-Nano-Package-Introduction

After that, you can follow standard methods to attach to /dev/ttyS1 using hciattach and configure BT/BLE. The important parameter that took me some digging to find is the baud rate is 1500000.

Example:
# hciattach -s 1500000 /dev/ttyS1 any 1500000
Device setup complete
# hciconfig hci0 up
# hciconfig set name MY_BT_DEV
# hciconfig hci0 down
# hciconfig hci0 up
# bluetoothctl power on
Changing power on succeeded
# bluetoothctl pairable on
Changing pairable on succeeded
# bluetoothctl discoverable on
Changing discoverable on succeeded
[CHG] Controller XX:XX:XX:XX:XX:XX Discoverable: yes