That seems to be exactly it: On Sat, 6 Jan 2018 22:42:30 +0100 (CET) Mark Kettenis <mark.kette...@xs4all.nl> wrote: > Is it a USB 1.x device? If so, it won't work when directly connected It seems so. On adm64 it reports as "full speed": port 5 addr 5: full speed, power 100 mA, config 1, USB-Serial Controller(0x2303), Prolific Technology Inc.(0x067b), rev 3.00 Also, the Prolific page states for all 2303 models "On chip USB 1.1 transceiver".
> to the USB port of these Allwinner-based devices. Can you try with a > USB 2.0 hub in between? I connected a USB 2.0 hub, and now it works, kind of: Controller /dev/usb1: addr 1: high speed, self powered, config 1, EHCI root hub(0x0000), Generic(0x0000), rev 1.00 port 1 addr 2: high speed, self powered, config 1, USB2.0 Hub(0x0608), Genesys Logic(0x05e3), rev 77.64 port 1 powered port 2 powered port 3 addr 3: full speed, power 100 mA, config 1, USB-Serial Controller(0x2303), Prolific Technology Inc.(0x067b), rev 3.00 port 4 powered I have to first plug the adapter into the USB hub, and then connect the USB hub to the Pi. If I first plug in the hub and then the adapter, the adapter is not detected. Same with unplugging; if I only unplug the adapter nothing happens; usbdevs still shows it present. I have to unplug the USB hub. Even if I connect 4 adapters to the hub, and then connect the hub, all get detected now: Controller /dev/usb0: addr 1: high speed, self powered, config 1, EHCI root hub(0x0000), Generic(0x0000), rev 1.00 port 1 addr 2: high speed, self powered, config 1, USB2.0 Hub(0x0608), Genesys Logic(0x05e3), rev 77.64 port 1 addr 3: full speed, power 100 mA, config 1, USB-Serial Controller(0x2303), Prolific Technology Inc.(0x067b), rev 3.00 port 2 addr 4: full speed, power 100 mA, config 1, USB-Serial Controller(0x2303), Prolific Technology Inc.(0x067b), rev 3.00 port 3 addr 5: full speed, power 100 mA, config 1, USB-Serial Controller D(0x2303), Prolific Technology Inc.(0x067b), rev 4.00 port 4 addr 6: full speed, power 100 mA, config 1, USB-Serial Controller(0x2303), Prolific Technology Inc.(0x067b), rev 3.00 Thanks for the help! regards, Robert
