Vendor has x86 driver, am I asking for too much for ARM version?

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I want to use a USB Data Aquisition Module with a ARM based win CE 6.0 system

The USB DAQ manufacturer claims to have a x86 driver for CE 6.0

but claims they do not have an ARM version for the following reason:
""Since the USB performance in WinCE ARM system is poor..."
(I have a i.mx31 dev kit with 533 MHz ARM core)

any guesses what is going on? doesn't the driver simply get built with the
ARM processor selected instead of x86?

what is the magnitude of effort that I would be asking of the vendor to make
a ARM driver given that they already have a presumably working x86 CE 6.0
version?

at worst couldn't they rebuild the drivers with my platform's SDK?

any good questions I should ask them?


.

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