device enumeration

Is there a way to specify the order in which devices are detected on bootup?
It doesn't look like it to me, but I'm not sure I understand the code well
enough to say.

We have a board running linux 2.6, which always seems to discover an
external usb key first if one is there. This gets assigned to /dev/sda1, and
the internal usb flash gets assigned to /dev/sdb1.

However, if a key isn't plugged in, the internal flash gets assigned to
/dev/sda1. Our software needs a way to tell which device file is associated
with the internal flash.

I can root around in /sys and get an answer, but I'm hoping there's a better
way. Incidentally, this board does not run udev, so that's not an option
unfortunately.

Thanks

Joe

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