amd64/151031: Not all RAM is found on GA-E7AUM-DS2H motherboard

[Thor Frølich]

>Number:         151031
>Category:       amd64
>Synopsis:       Not all RAM is found on GA-E7AUM-DS2H motherboard
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-amd64
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Sep 28 13:40:02 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Thor Frølich
>Release:        FreeBSD 8.1-RELEASE amd64
>Organization:
n/a
>Environment:
FreeBSD ninjapants 8.1-RELEASE FreeBSD 8.1-RELEASE #0: Mon Jul 19 02:36:49 UTC 2010     root at mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64
>Description:
Only 1GB RAM found (according to "dmesg | grep memory") in a 2GB system with motherboard of make and type: Gigabyte GA-E7AUM-DSH2.

>How-To-Repeat:
1. Install FreeBSD 8.1-RELEASE amd64 on machine with more than 1GB RAM and a Gigabyte GA-E7AUM-DS2H motherboard.
2. Run "dmesg | grep memory"
3. Observe output: "real memory  = 1073741824 (1024 MB)"
>Fix:
According to this webpage it's a problem with SMAP:

http://miko.org/~tatyana/tech/FreeBSD/FreeBSD_on_GA-E7AUM-DS2H_with_Over_2GB_of_RAM.html

A patch for biossmap.c is given on said website, but I've no idea if it works or is sane:

http://miko.org/~tatyana/tech/FreeBSD/FreeBSD_8.0_GA-E7AUM-DS2H_Over2GB.diff

>Release-Note:
>Audit-Trail:
>Unformatted: