无法初始化设备 hci0：蓝牙设备连接超时 (110)

Question

每次连接 hciattach 时，但 hciconfig hci0 up 给出的结果为“无法初始化设备 hci0：连接超时 (110)”

# rfkill list
1: phy0: wlan
        Soft blocked: no
        Hard blocked: no
2: hci0: bluetooth
        Soft blocked: no
        Hard blocked: no
3: hci1: bluetooth
        Soft blocked: no
        Hard blocked: no
4: hci2: bluetooth
        Soft blocked: no
        Hard blocked: no
# hciconfig -a

hci0:   Type: Primary  Bus: UART
        BD Address: 00:00:00:00:00:00  ACL MTU: 0:0  SCO MTU: 0:0
        DOWN
        RX bytes:0 acl:0 sco:0 events:0 errors:0
        TX bytes:12 acl:0 sco:0 commands:3 errors:0
        Features: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
        Packet type: DM1 DH1 HV1
        Link policy:
        Link mode: SLAVE ACCEPT