A couple notes. It is possible that one or more DIMMs are disabled. You
can list disabled devices by specifying "-i" to ndctl list:
ndctl list -Di
One reason for a DIMM to not be recognized is a failure reading the DIMM
label area.
As for the the memmap= option, it is expected that there are no DIMM
devices associated with that. Only the ACPI NFIT provides the
information to associate DIMMs to an address range, the memmap= option
only specifies an address range with no associated DIMM information.
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https://bugs.launchpad.net/bugs/1781268
Title:
SRU ndctl into Bionic
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