Had the same problem here. We had to go back to 6.3 because the newer kernel on 6.4 and beyond is not supported by the Mellanox RPMs for this chip since they dropped support for the 1.5x series of FW. The problem is that there is not an update for the firmware on this chip either. From what I gathered on the mellanox site it seems that the chip is legacy now. This really sucks, because is still being packaged on current servers like the SuperMicro twinblades but now we can't run newer kernels.
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