port-sgimips/46312: sgimips port will only report up to 128MB of physical memory on IP20, and up to 256MB on IP22

[miod%online.fr@localhost]

>Number:         46312
>Category:       port-sgimips
>Synopsis:       sgimips port will only report up to 128MB of physical memory 
>on IP20, and up to 256MB on IP22
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    port-sgimips-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Apr 08 23:45:00 +0000 2012
>Originator:     Miod Vallat
>Release:        
>Organization:
>Environment:
>Description:
NetBSD/sgimips gets memory information from ARCBios; however said information 
will only return up to 128MB on IP20 (at least with prom version 4.0.5G), and 
up to 256MB on IP22/IP24.
>How-To-Repeat:
Code inspection.
>Fix:
Compute actual memory information from the IMC MEMC registers.