저는 Debian 11, 커널 5.10 .168-ti-r71이 있는 beaglebone black을 사용하고 있습니다. 또한 SIM7000E라는 GSM 모뎀이 연결되어 있습니다. PPP 연결을 시도하고 있습니다. 몇 주 전에 시도했을 때 아무런 문제가 없었습니다. 오늘 다시 시도해보고 싶은데 syslog 파일에 이상한 문제가 보입니다.
BeagleBone kernel: [ 416.877062] musb-hdrc musb-hdrc.1: Babble
BeagleBone kernel: [ 416.881245] musb-hdrc musb-hdrc.1: VBUS_ERROR in a_wait_bcon (89, <AValid), retry #1, port1 00010100
BeagleBone kernel: [ 416.881255] musb-hdrc musb-hdrc.1: Babble
BeagleBone kernel: [ 416.885854] usb 1-1: USB disconnect, device number 3
BeagleBone kernel: [ 416.886719] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
BeagleBone kernel: [ 416.886831] option 1-1:1.0: device disconnected
BeagleBone kernel: [ 416.893381] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
BeagleBone kernel: [ 416.893524] option 1-1:1.1: device disconnected
BeagleBone kernel: [ 416.903030] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
BeagleBone kernel: [ 416.903144] option 1-1:1.2: device disconnected
BeagleBone kernel: [ 416.904638] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
BeagleBone kernel: [ 416.904765] option 1-1:1.3: device disconnected
BeagleBone kernel: [ 416.909438] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
BeagleBone kernel: [ 416.909583] option 1-1:1.4: device disconnected
BeagleBone kernel: [ 416.910033] qmi_wwan 1-1:1.5 wwan0: unregister 'qmi_wwan' usb-musb-hdrc.1-1, WWAN/QMI device
BeagleBone kernel: [ 422.193485] usb 1-1: new high-speed USB device number 4 using musb-hdrc
BeagleBone kernel: [ 422.345237] usb 1-1: New USB device found, idVendor=1e0e, idProduct=9001, bcdDevice= 0.00
BeagleBone kernel: [ 422.345265] usb 1-1: New USB device strings: Mfr=3, Product=2, SerialNumber=4
BeagleBone kernel: [ 422.345275] usb 1-1: Product: SimTech SIM7000
BeagleBone kernel: [ 422.345284] usb 1-1: Manufacturer: SimTech, Incorporated
BeagleBone kernel: [ 422.345293] usb 1-1: SerialNumber: 1234567890ABCDEF
BeagleBone kernel: [ 422.358236] option 1-1:1.0: GSM modem (1-port) converter detected
BeagleBone kernel: [ 422.359020] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0
BeagleBone kernel: [ 422.359843] option 1-1:1.1: GSM modem (1-port) converter detected
BeagleBone kernel: [ 422.362388] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1
BeagleBone kernel: [ 422.363401] option 1-1:1.2: GSM modem (1-port) converter detected
BeagleBone kernel: [ 422.373416] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB2
BeagleBone kernel: [ 422.374494] option 1-1:1.3: GSM modem (1-port) converter detected
BeagleBone kernel: [ 422.375296] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB3
BeagleBone kernel: [ 422.376173] option 1-1:1.4: GSM modem (1-port) converter detected
BeagleBone kernel: [ 422.378195] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB4
BeagleBone kernel: [ 422.386130] qmi_wwan 1-1:1.5: cdc-wdm0: USB WDM device
BeagleBone kernel: [ 422.397844] qmi_wwan 1-1:1.5 wwan0: register 'qmi_wwan' at usb-musb-hdrc.1-1, WWAN/QMI device, 06:8e:b>
BeagleBone systemd-udevd[1425]: Using default interface naming scheme 'v247'.
BeagleBone systemd-udevd[1425]: ethtool: autonegotiation is unset or enabled, the speed and duplex are not writable.
ttyUSB2(모뎀이 AT 명령에 사용하는 포트)에서 미니콤을 열면 모뎀과 통신할 수 있지만 SIM 카드용 핀을 입력하면 미니콤이 멈춰서 다음과 같은 말을 하게 됩니다.
Cannot open /dev/ttyUSB2!
다른 모뎀 SIM7600E로도 시도해 보았는데 위와 같은 문제가 발생합니다. 시스템을 재부팅하고 전원을 켜고 끄고 전원 공급 장치를 확인했지만 여전히 아무것도 작동하지 않습니다. 시스템에 ethtool이 설치되어 있지 않습니다. 위의 문제에 대한 아이디어와 해결 방법이 있습니까?