40 vs 44 bit memory addressing HP DL580/980

John Baldwin jhb at freebsd.org
Mon Nov 22 13:08:24 UTC 2010

On Sunday, November 21, 2010 8:05:26 pm Sean Bruno wrote:
> Looks like these HP boxes have the capability to do 44 bit memory
> addressing if configured to do so from the BIOS.
> Is anyone interested in any data from that setting?

Does it boot ok? :)  The MTRR code should handle that (there is a CPUID
field that tells the OS how many bits are significant).  Not sure if there
are any places in the pmap that assume 40 bits, but a test boot is certainly
worth trying.

John Baldwin

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