"Sid Spry" <sid@xxxxxxx> writes: > On Mon, Aug 24, 2020, at 1:16 AM, Felipe Balbi wrote: >> >> Hi, >> >> "Sid Spry" <sid@xxxxxxx> writes: >> > See title. I'm getting this even when using shell commands, so I don't >> > think it is my program. Creating anything else, like ncm.usb0, will >> > work. >> >> which kernel version? which usb controller? which platform? >> > > Kernel 5.4.45 compiled for a Raspberry Pi 4, the UDC is a DWC2. great. Latest v5.4 stable is v5.4.60. There have been a few fixes in dwc2 and gadget drivers between .45 and .60. Just to rule out a problem that was already fixed, could you merge v5.4.60 to your kernel and try again? > On another device (Allwinner based) I could add one serial gadget > but not two, and I though this may have been endpoint exhaustion. Now > I am not so sure. It could exhaustion of Interrupt-capable endpoints. It depends on how the gadget and the UDC were configured. cheers -- balbi
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