Strange hang of an FD on SPEC in slot 11 (only) of KISS 4U
Reported at CERN under https://issues.cern.ch/browse/DRVR-178
In short, loading the FMC-FDELAY firmware/driver causes a Kontron
KISS-4U-762 to freeze right after load, with a certain probability, if
the SPEC is living in slot 11 (not in slot 10).
This is the phenomenon observed in DRVR-175. It has nothing to do with the identity of the SPEC board or the fine delay; it happened with different SPECs, FDs and crates, as long as the combination was installed in slot 11.
We may conclude that the KISS 4U PCI-762 with spec+fine delay in slot 11
(4x) exhibits this behaviour. To be investigated (it might be a driver
bug, but looks more like a fine delay firmware problem related to some
PCI bus timing; no idea).
It does not seem the masterFIP exhibits this behaviour, but I have not researched on the configurations used to test it (in particular, avoidance of slot 11 seems unlikely, given that the 1x slots of the 4Us are useless with the 4x PCIe connector of the SPEC).