[U-Boot] how to support usbtty

[mike zheng]

I am using an embedded system with MPC8567 as processor and ISP1561 as
USB PCI host controller. There is USB port on this board. A sealevel
USB/RS232 cable is connect to the USB port on the board, and it
converts USB port into RS232 port. A PC is connected to the RS232 end
of the cable.

With "CONFIG_USB_SERIAL_FTDI_SIO" flag enabled, I compiled the Linux
kernel. Everything works fine, I am able to launch the hyperterminal
on PC and have the console running for Linux.

Now I need make things working for Uboot. I've already have the EHCI
host controller running well on the board.

Please correct me if my understanding is incorrect. What I need to do
is to port the FTDI_SIO driver from Linux to Uboot, which replace
those "udc" calls in usbtty.c. With the ported FTDI_SIO code and
existing usbtty.c. It shall work fine after correct setup of the
environment variables - "setenv stdin usbtty, setenv stdout usbtty".

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.

Thanks,

On 8/26/08, Wolfgang Denk <wd at denx.de> wrote:
> Dear mikezh,
>
> In message <19167791.post at talk.nabble.com> you wrote:
> >
> > Any document on how to use usbtty?
>
> Did you read the README?
>
> You enable it using the commands "setenv stdout usbtty; setenv stdin usbtty"
>
>
> > I have a USB-RS232 cable to convert the USB port into a RS232 port. Do I
> > need any driver? What environment variable shall I set?
>
> If you want to attach the cable to a USB port on the target that runs
> U-Boot, you obviously  need  the  matching  usbtty  driver  for  your
> hardware.
>
>
> Best regards,
>
> Wolfgang Denk
>
> --
> DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
> Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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>