On all boots, the MCX313A-BCBT 40GbE adapter brings up the Mellanox FlexBoot screen. However on some occasions, it hangs and does not let the boot process continue.
In such a case, it prints:
Mellanox FlexBoot v3.4.521
iPXE (http://ipxe.org) 0A:00.0 003E PCI3.00 PnP PMM+_
..and then it just stops until a power cycle.
Any ideas why?