If the word "supported" is crucial in your question, then the answer is "no" ...
You could try downloading and building your own ODBC driver (UnixODBC.org) but my question would be: why ? in 90% of the cases you're offloading only calculations to the Phi and you'd let the host do the ODBC queries.
So for the other 10% of the cases - I'd like to communicate with SQL Server from the card(s). Your suggestion is to build my own ODBC driver - if that's all that's available, then that's what I'll do.
For what I'm doing, we're not offloading to the card(s). We're running natively.
Thanks for your input.