FreeBSD/src 1a3eaf6 (r334015)sys/conf files.powerpc, sys/powerpc/powernv opal_ipmi.c opal.h

Add an IPMI attachment for PowerNV systems

IPMI access on PowerNV systems is done through the OPAL firmware.  This adds a
simple attachment for communicating with the FSP/BMC on these machines.  This
has been tested on a Talos POWER9 workstation, only in the bootup phase, noting
the successful attachment messages:

...
ipmi0: IPMI device rev. 0, firmware rev. 2.00, version 2.0, device support mask 0
ipmi0: Number of channels 2
...

The ipmi device has not been added to GENERIC64, but may be after further
testing.  It may also eventually be added to the ipmi module at that point.
DeltaFile
+241-0sys/powerpc/powernv/opal_ipmi.c
+15-0sys/powerpc/powernv/opal.h
+2-0sys/conf/files.powerpc
+258-03 files

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