[U-Boot] usbtty using i.MX6

[Eric Nelson]

Hi Eric,

On 04/27/2014 02:05 AM, Eric Bénard wrote:
> Hi Otavio,
>
> Le Sat, 26 Apr 2014 19:47:27 -0300,
> Otavio Salvador <otavio at ossystems.com.br> a écrit :
>> I'd like to know if someone has succeed in using usbtty with i.MX6. I
>> am interested in using it for one board but been not succed, it seems:
>>
>> /home/otavio/hacking/u-boot/drivers/serial/usbtty.c:553: undefined
>> reference to `udc_init'
>> drivers/serial/built-in.o: In function `usbtty_init_instances':
>> /home/otavio/hacking/u-boot/drivers/serial/usbtty.c:686: undefined
>> reference to `udc_setup_ep'
>> /home/otavio/hacking/u-boot/drivers/serial/usbtty.c:708: undefined
>> reference to `urb_link_init'
>> /home/otavio/hacking/u-boot/drivers/serial/usbtty.c:709: undefined
>> reference to `urb_link_init'
>> /home/otavio/hacking/u-boot/drivers/serial/usbtty.c:710: undefined
>> reference to `urb_link_init
>> ...
>>
>> Does someone got it working?
>>
> you need a gadget driver for the i.MX6 USB port which doesn't seems to
> exist in u-boot.
>

We're using UDC on all of our i.MX6 board. Marek and Troy have had this
working for a while now.

I think the two key patches are these:
	https://github.com/boundarydevices/u-boot-imx6/commit/f3d7cff
	https://github.com/boundarydevices/u-boot-imx6/commit/f016f8c

We've been using it a lot for USB networking, where it provides a
very nice download mechanism. See this post for details:
	http://boundarydevices.com/u-boot-2014-01/#usbrecover

I think usbtty is a different thing though (USB serial adapter connected
to a Host port).

We haven't tested that, but it should work. Most of our USB Host uses
have been for USB sticks and keyboards.

Regards,


Eric