Are there any application with this EZ_USB in linux we can play around?
Rgds,
Li Yi
Greg KH wrote:
> On Tue, Apr 17, 2001 at 01:07:55PM -0700, Adam J. Richter wrote:
> > Here is a first draft of a userland program for loading
> > EZUSB "firmware" automatically through the hotplugging system.
> > This should not only fix the copyright problems, but will also
> > make the kernel a bit smaller and make it easier to but EZUSB device
> > devlopment.
> >
> > I do not have any EZUSB device on which to try it, so
> > I have no idea if it works, and I have not converted the keyspan*fw.h
> > files to data files for it yet. However, any input, experimentation
> > or comments are welcome.
>
> This will not work as currently written, but is a great step forward
> (I've always disliked the usb-serial drivers being so big due to the
> firmware images.)
>
> You need to toggle the reset pin on the EZUSB device at specific times
> in the loading process to get everything to work properly.
>
> > /* Read a list of EZUSB upload records from standard input.
> > The format of these records is as follows:
> >
> > command address length data1 data2 data3....up to a maximum of data16
> >
> > command is either 0xa0 or 0xa3. It is passed in the USB control command.
> > Its exact meaning is unclear.
>
> The whiteheat device uses 0xa3 because it loads first a special loader
> that uses 0xa3 to tell the whiteheat device to load this specific data
> to a different place in memory (a different bank/high mem type thing
> from what I have been able to determine.)
>
> So for the whiteheat device you need to do the following to get the
> firmware properly loaded:
> - set the reset pin to 1
> - load the firmware loader with command 0xa0
> - set the reset pin to 0
> - load a specific portion of the application firmware with
> command 0xa3
> - set the reset pin to 1
> - load a specific portion of the application firmware with
> command 0xa0
> - set the reset pin to 0
>
> Then the device resets itself, and reenumerates as the new device.
>
> While the keyspan_pda needs the following sequence to get firmware
> properly:
> - set the reset pin to 1
> - load the firmware with command 0xa0
> - set the reset pin to 0
>
> Much simpler :)
>
> I don't have a problem having the whiteheat application being whiteheat
> specific, since it is an odd one (I don't know of any other EZUSB
> devices with special loader firmware, but there probably are.)
>
> If you want to do something like this, please do. I'd be glad to change
> the whiteheat and keyspan* drivers, and maintain this as a separate
> userspace package. I just don't have the initial time to do the work at
> this moment.
>
> thanks a lot,
>
> greg k-h
>
> --
> greg@(kroah|wirex).com
>
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