I have managed to get this working on an older version of the kernel. I have tried raspberry pi os buster (debian version 10) and the serial port was correctly created. It was Raspberry pi os bullseye (debian 11) that this did not work for. Giles Roadnight http://giles.roadnight.name Giles Roadnight http://giles.roadnight.name On Sat, 18 Jun 2022 at 07:42, Giles Roadnight <giles.roadnight@xxxxxxxxx> wrote: > > Hi > > I am trying to connect a Prolific pl2303 to my raspberry pi 4 running > raspberry pi os 64 bit. When I look at dmesg I get the following > output: > > [ 31.714397] cam-dummy-reg: disabling > [ 44.046197] usb 1-1.1: USB disconnect, device number 3 > [ 47.254348] usb 1-1.1: new full-speed USB device number 4 using xhci_hcd > [ 47.361386] usb 1-1.1: New USB device found, idVendor=067b, > idProduct=23a3, bcdDevice= 6.05 > [ 47.361402] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > [ 47.361407] usb 1-1.1: Product: USB-Serial Controller > [ 47.361412] usb 1-1.1: Manufacturer: Prolific Technology Inc. > [ 47.361417] usb 1-1.1: SerialNumber: ALBAb115819 > [ 47.364081] pl2303 1-1.1:1.0: pl2303 converter detected > [ 47.364106] pl2303 1-1.1:1.0: unknown device type, please report to > linux-usb@xxxxxxxxxxxxxxx > > so I followed the example and emailed this address! > > and with lsusb: > > lsusb -v > Bus 001 Device 004: ID 067b:23a3 Prolific Technology, Inc. USB-Serial Controller > Couldn't open device, some information will be missing > Device Descriptor: > bLength 18 > bDescriptorType 1 > bcdUSB 2.00 > bDeviceClass 0 > bDeviceSubClass 0 > bDeviceProtocol 0 > bMaxPacketSize0 64 > idVendor 0x067b Prolific Technology, Inc. > idProduct 0x23a3 > bcdDevice 6.05 > iManufacturer 1 Prolific Technology Inc. > iProduct 2 USB-Serial Controller > iSerial 3 ALBAb115819 > bNumConfigurations 1 > Configuration Descriptor: > bLength 9 > bDescriptorType 2 > wTotalLength 0x0027 > bNumInterfaces 1 > bConfigurationValue 1 > iConfiguration 0 > bmAttributes 0xa0 > (Bus Powered) > Remote Wakeup > MaxPower 100mA > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 0 > bNumEndpoints 3 > bInterfaceClass 255 Vendor Specific Class > bInterfaceSubClass 0 > bInterfaceProtocol 0 > iInterface 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x81 EP 1 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x000a 1x 10 bytes > bInterval 1 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x02 EP 2 OUT > bmAttributes 2 > Transfer Type Bulk > Synch Type None > Usage Type Data > wMaxPacketSize 0x0040 1x 64 bytes > bInterval 0 > Endpoint Descriptor: > bLength 7 > bDescriptorType 5 > bEndpointAddress 0x83 EP 3 IN > bmAttributes 2 > Transfer Type Bulk > Synch Type None > Usage Type Data > wMaxPacketSize 0x0040 1x 64 bytes > bInterval 0 > > Any help much appreciated. Thanks > > Giles Roadnight > http://giles.roadnight.name
