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Full Discussion: USB power cycling poblem on RPI
Special Forums Hardware USB power cycling poblem on RPI Post 302935945 by Corona688 on Friday 20th of February 2015 12:09:36 PM
Old 02-20-2015
It may be possible, if you compile your USB controllers etc. drivers as modules. Then you could rmmod them and modprobe them to reload.

I know it's difficult to get a listing of a crash from the kernel after it's crashed, but it would be interesting to see it if you could manage a photograph.

Most USB controllers can't do this, I'm not surprised there are bugs or pitfalls. Perhaps there's something that needs to be done first, before you force it off.
 

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LEARN ABOUT CENTOS

ehci

EHCI(4)                                                    BSD Kernel Interfaces Manual                                                    EHCI(4)

NAME

     ehci -- USB Enhanced Host Controller driver

SYNOPSIS

     device ehci

DESCRIPTION

     The ehci driver provides support for the USB Enhanced Host Controller Interface, which is used by USB 2.0 controllers.

     EHCI controllers are peculiar in that they can only handle the USB 2.0 protocol.  This means that they normally have one or more companion
     controllers (i.e., ohci(4) or uhci(4)) handling USB 1.x devices.  Consequently each USB connector is electrically connected to two USB con-
     trollers.  The handling of this is totally automatic, but can be noticed since USB 1.x and USB 2.0 devices plugged in to the same connector
     appear to connect to different USB busses.

SEE ALSO

     ohci(4), uhci(4), usb(4)

HISTORY

     The ehci device driver first appeared in FreeBSD 5.1.

BUGS

     The driver is not finished and is quite buggy.

     There is currently no support for isochronous transfers.

BSD                                                               March 20, 2005                                                               BSD
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