我使用的是 beaglebone black，其版本為 Debian 11，核心 5.10 .168-ti-r71。我還連接了一個 GSM 數據機 SIM7000E。我正在嘗試進行 PPP 連線。幾週前，當我嘗試時，我沒有遇到任何問題。今天，我想再試一次，我在系統日誌檔案中看到一個奇怪的問題。
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.
如果我在 ttyUSB2（調製解調器用於 AT 命令的連接埠）上開啟 minicom，我可以與調製解調器通信，但是當我輸入 SIM 卡的引腳時，minicom 將卡住並顯示類似內容
Cannot open /dev/ttyUSB2!
我也用另一個調變解調器SIM7600E嘗試過，也有與上述相同的問題。我重新啟動系統，打開/關閉電源，檢查電源，但仍然無法運作。我的系統中沒有安裝 ethtool。對於上述問題有什麼想法以及如何解決嗎？