Tiny Core Base > Raspberry Pi

libusb not showing devices

<< < (4/4)

gadget42:
additional information from searching the web for "dwc_otg.fiq_fsm_mask=0xF dwc_otg.lpm_enable=0"
https://raspberrypi.stackexchange.com/questions/1886/what-kernel-parameters-are-available-for-fixing-usb-problems
https://forums.raspberrypi.com/viewtopic.php?t=70437&start=225

kkrpeq:
I have tried a bunch of different bootcodes, but none worked.
What did work was shortening the USB cable of DeviceB. Although the original cable length was within the specs of USB 2.0, I suppose the USB controller in the Pi needs a very clean signal to work properly, and the controller could not handle the signal noise and loss induced by the cable. In this sense, the USB hub acts as a "repeater", "cleaning" the digital signal.

Rich:
Hi kkrpeq

--- Quote from: kkrpeq on May 02, 2022, 08:38:20 PM --- ... What did work was shortening the USB cable of DeviceB. Although the original cable length was within the specs of USB 2.0, ...
--- End quote ---
It may just have been a defective cable.

Navigation

[0] Message Index

[*] Previous page