Re: [Qemu-devel] State of EHCI emulation for QEMU

[Jan Kiszka <jan.kiszka@web.de>]

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Am 04.12.2010 01:18, Gerd Hoffmann wrote:
>   Hi,
> 
>> as you may know, there is an experimental git repository at
>>
>>     git://git.kiszka.org/qemu.git ehci
> 
> Looking into this right now as I'm busy with various usb issues anyway.
> Current state:
>   http://cgit.freedesktop.org/spice/qemu/log/?h=usb.1
> 
>>   - lacks integration with UHCI (currently, only EHCI is provided by
>>     that tree, breaking USB 1.1 devices)
> 
> Sort-of fixed (see docs/usb2.txt).

Very nice. Some remarks:

- command line must look like this:
        ...
        -drive if=none,id=usbstick,file=/path/to/image   \
        -device usb-storage,bus=ehci.0,drive=usbstick
  ie. register driver device referencing it, and there was a typo id->if

- long-term, "-usb" should become a shorthand for "-device
  usb-uhci,id=uhci -device usb-ehci,id=ehci" (at least for x86)

Unfortunately, msd is not yet magically healed:

  non queue head request in async schedule
  processing error - resetting ehci HC

> 
>> David furthermore provided the following to-dos:
>>   - lacks periodic frames support
>>   - lacks isochronous traffic support
> 
> --verbose please.  There seems to be some code for that?
> 
>>   - lacks split transactions support
> 
> That would need a USB 2.0 HUB emulation to be useful.
> We lack that one too ;)
> 
>>   - NAK/reload support is kludgy at best
> 
> --verbose please.
> 

Those are questions for David.

Jan

PS: Your tree lacks conversion of usb-musb.c.


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