On 03/18/13 23:39, Ronald F. Guilmette wrote:
1) What is the best way to debug this? I have seen HPS suggest to others
with USB problems that they either (a) use the usbdump(8) command to get
more info about the problems or else (b) compile and install a new kernel
in which the option USB_DEBUG has been defined. Which should I do, and
how may I interpret the results in either case?
I see two kind of hangs:
1) IRQ is spinning
2) DMA is going wild in the memory
In sys/dev/usb/controller/xhci.c there are debug prints, DPRINTF() and
DPRINTFN(). You probably want to have a print in the interrupt routine.
Just search for "interrupt". Debug level is controlled via sysctl
2) What are the command timeouts set to in the XHCI driver and how can I
increase them? (Perhaps my card is just barely meeting the published
USB standard timing specs, and just need a tiny bit more time?)
The XHCI is an active USB controller. That means many high-level USB
commands must be fed into it using separate commands. These have nothing
to do with what is transferred to the USB device.
3) What exactly is "hw.usb.no_cs_fail" ?
This just instructs the system to not re-enumerate the device on
repeated clear stall failures.
4) What exactly is "hw.usb.u3g.debug" ?
That's debugging for u3g driver module.
5) What exactly is "diveration" ?
Where did you find this?
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