[U-Boot] how to support usbtty

[mike zheng]

Hi Bryan,

The USB/RS232 cable is a USB device, it shall has firmware in it,
which works as a USB slave. What I need to do is have some code talk
to this device via the Host controller - ISP1561. So, I need some code
as usb-storage.c, maybe called usb-serial.c.


I am not sure how "usbtty" being used. Is it used when there is a
USB/USB cable connected between the target and PC? Both ends of the
cable are USB port, the PC end is a master, the target end is the
slave. So usbtty running on the target is acting as the USB device.
However it is not my case. The cable I have has one USB end, and one
RS232 end. The USB end is connected to the target. I assume there is
something in the chip within the cable acts as a USB slave device
already.

Thanks,

Mike

On 8/27/08, Bryan O'Donoghue <bodonoghue at codehermit.ie> wrote:
> On Wed, 27 Aug 2008 10:20:58 -0400
> "mike zheng" <mail4mz at gmail.com> wrote:
>
> > Or is there any other solution for me? I don't have to use the
> > USB-RS232 cable. I just need the Uboot console from USB port.
>
> One more thing.
>
> If the isp1561 supports "slave" mode - you can implement usbdcore_isp1561.c and
> add fdti to usbtty... otherwise as previously stated you'll have to munge
> something on top of some host controller code, and then plug that into the
> serial layer independently.
>
>
> --
> BOD
>