Hello, this is a popular in UK education board: https://microbit.org/ - the currently sold (Version 2) one. It does on the same USB 3 things: mass storage, ACM, and serial. Serial appears unknown to the kernel. With Linux kernel 6.0.8 on x86_54, and various USB serial drivers installed, upon plugging into USB port, I see in dmesg: [45460.035306] usb 1-3: new full-speed USB device number 10 using xhci_hcd [45460.166959] usb 1-3: New USB device found, idVendor=0d28, idProduct=0204, bcdDevice=10.00 [45460.166965] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [45460.166967] usb 1-3: Product: BBC micro:bit CMSIS-DAP [45460.166968] usb 1-3: Manufacturer: Arm [45460.166970] usb 1-3: SerialNumber: 9905360200052833525e24a702a68552000000006e052820 [45460.172168] usb-storage 1-3:1.0: USB Mass Storage device detected [45460.172538] scsi host1: usb-storage 1-3:1.0 [45460.173203] cdc_acm 1-3:1.1: ttyACM0: USB ACM device [45460.175258] hid-generic 0003:0D28:0204.0005: hiddev96,hidraw0: USB HID v1.00 Device [Arm BBC micro:bit CMSIS-DAP] on usb-0000:00:14.0-3/input3 [45460.175581] usbserial_generic 1-3:1.4: The "generic" usb-serial driver is only for testing and one-off prototypes. [45460.175585] usbserial_generic 1-3:1.4: Tell linux-usb@xxxxxxxxxxxxxxx to add your device to a proper driver. [45460.175587] usbserial_generic 1-3:1.4: device has no bulk endpoints [45460.175818] usbserial_generic 1-3:1.5: The "generic" usb-serial driver is only for testing and one-off prototypes. [45460.175821] usbserial_generic 1-3:1.5: Tell linux-usb@xxxxxxxxxxxxxxx to add your device to a proper driver. [45460.175823] usbserial_generic 1-3:1.5: generic converter detected [45460.175905] usb 1-3: generic converter now attached to ttyUSB0 [45461.175731] scsi 1:0:0:0: Direct-Access MBED VFS 0.1 PQ: 0 ANSI: 2 [45461.176279] sd 1:0:0:0: [sdb] 131200 512-byte logical blocks: (67.2 MB/64.1 MiB) [45461.176480] sd 1:0:0:0: [sdb] Write Protect is off [45461.176484] sd 1:0:0:0: [sdb] Mode Sense: 03 00 00 00 [45461.176659] sd 1:0:0:0: [sdb] No Caching mode page found [45461.176661] sd 1:0:0:0: [sdb] Assuming drive cache: write through [45461.186409] sdb: [45461.186439] sd 1:0:0:0: [sdb] Attached SCSI removable disk Best regards, Dmitrii www.pasechnik.info
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