[U-Boot] usbtty Support on AT91SAM9XXX chipsets

[Daniel Sherwood]

Remy

> 
> There are indeed 2 routes:
> 1. If you need a serial console, you can still use it with the older
> usbtty code.
> 2. Adapt the new CDC layer such that it becomes suitable for console
> purposes as well. I would be happy integrating patches for this in the
> USB branch. That would allow us to migrate to 1 usb-gadget layer in
> the future which can be kept close to the linux development.
> 

If we were to take option 1 then what do you propose would be the easiest way of integrating the current usbtty implementation with the AT91 USB device.  Is a 'wrapper' between the two frameworks practical or would we be better off writing a new UDC implementation for AT91 that matches the other implementations.

For option 2, I think we need to take serial.c and u_serial.c from Linux and then make them work with the uBoot console framework.  Is this correct?

> > Also, if this is the
> > way to go, could someone confirm which version of the Linux Gadget
> > framework ether.c and friends are based on.  It appears to be completely
> > different to the latest version.
> 
> It is a port from Linux 2.6.27 to U-boot.
> Latest kernel changes are not integrated yet. But the port was kept
> quite close to the original code to make it easier to upgrade later
> on.

OK, we'll have a look at that version as a starting point.  I presume you mean the original 2.6.27, not any of the 2.6.27.x series.

> 
> Kind Regards,
> 
> Remy


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