Currently we do not have drivers for Debian 9, we support up till Debian 8.3.
Our next driver release (scheduled for the end of June ) will support Debian 8.7.
Being near the end of June, are you still planning a release for 8.7 before month's end?
Is there any difference in OS support for ConnectX-2 devices?
MLNX_OFED should be released in the next few days.
Our website will be updated with new release:
ConnectX-2 adapters are end-of-life and are not supported by the driver.