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Implementing serial device

Hi. I'm developing a flight display product on an Intel Xscale PXA320 CPU. I try to do all my development from a Mac, but there are Windoze users on the team that must be supported as well.

We're using the PXA320's USB 2.0 device controller as a development communications port. We need to implement some kind of simple device, but I'm not sure what I should pursue.

If I understand things correctly, there is a serial port CDC device, that if implemented properly, would allow us to talk to the PXA as if it were a serial port on the Mac. More importantly, it would show up as a serial port automatically, without the need for any host-side drivers. Is this the case?

Alternatively, we can implement a CDC Ethernet device, and then use higher-level facilities like TFTP (for which we already have source). But this is likely much more difficult.

The connection will be used for uploading new firmware to the device (JTAG will be used to get the initial bootloader/USB firmware on board), and as a debugging console (standard I/O will redirect to the host via USB).

Does anyone have any advice or suggestions on what to pursue? I'm thinking the serial device would be the easiest thing, But I don't know where to start to find the standard I need to implement.

Thank you very much.

--
Rick

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