On Tue, Oct 20, 2009 at 01:30:01AM -0600, Anathae E. Townsend wrote:
quoted text
> Off topic, I know, but I'm hoping some USB programming smart readers
> might know the answer to my question.
> 
> Are there available usb interface chips that an OEM can program the
> PID, VID, and Serial Number without having to specify it in the chip
> Mask?

Yes there are. The Zaurus for instance has an USB device controller.

http://www.openbsd.org/cgi-bin/man.cgi?query=usbf&sektion=4

quoted text
> If this is possible, USB devices cannot be guaranteed to be unique
> based on PID, VID and Serial number.

No they cannot.  OpenBSD is using:

#define CDCEF_VENDOR_ID        0x0001
#define CDCEF_PRODUCT_ID       0x0001
#define CDCEF_DEVICE_CODE      0x0100

for cdcef(4).

http://www.openbsd.org/cgi-bin/cvsweb/src/sys/dev/usb/if_cdcef.c?annotate=1.24

HTH,
    Marco