Re: M-Audio Sonica support

[Takashi Iwai <tiwai@suse.de>]

At Mon, 02 Sep 2002 19:24:14 +0200,
Clemens Ladisch wrote:
> 
> Takashi Iwai wrote:
> > Stephen Hassard wrote:
> > >      Interface Descriptor:
> > >        bLength                 9
> > >        bDescriptorType         4
> > >        bInterfaceNumber        0
> > >        bAlternateSetting       0
> > >        bNumEndpoints           0
> > >        bInterfaceClass       254
> > >        bInterfaceSubClass      1
> > >        bInterfaceProtocol      0
> > >        iInterface              3 RAM
> > >    unknown descriptor type: 07 21 05 00 01 40 00
> > 
> > hmm, the descriptor is apprently broken.
> > usually you'll see the list of interfaces, terminals, formats,
> > etc. there.
> > the device might be non-standard one.  if so, the current driver
> > doesn't support it, unfortuantely.
> 
> bInterfaceClass 254 = "Application-Specific"
> bInterfaceSubClass 1 = "Device Firmware Update"
> 
> And they bothered to give the interface a name ("RAM").  :-)
 
yep :)

> If it were a broken descriptor, it would be easy to make the correct
> information available with a quirk. In this case, however, we need the
> firmware and a loader.
> 
> The download protocol is described in the "USB Device Firmware
> Upgrade Specification". A loader might already exist, or is (relatively)
> easy to write.
> 
> For the firmware, we could _try_ to ask Midiman.

this is not bad idea - midiman / m-audio has been enough friendly to
us, so far...

> But I think a USB snoop log from the Windows driver would have a higher
> probability of success.

or, a higher rate of success :)

> (Unfortunately, the bmAttributes field in the
> DFU functional descriptor indicates that the device is only capable
> of downloading, not uploading.)
> If we have luck, the firmware is stored in a DFU file (not necessarily
> with that name).

Stephen, could you check whether any possible file eixsts on windows?


ciao,

Takashi


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