i386/79779: If system memory is above 4GB, one parts of memory will be ignored.

[eric.cho]

>Number:         79779
>Category:       i386
>Synopsis:       If system memory is above 4GB, one parts of memory will be ignored.
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Apr 11 06:30:28 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     eric.cho
>Release:        
>Organization:
Gigabyte Technology
>Environment:
FreeBSD 5.0-RELEASE FreeBSD 5.0-RELEASE #0: Thu Jan 16 22:16:53 GMT 2003 rot at hollin.btc.adaptect.com:/usr/obj/usr/src/sys/GENERIC i386
>Description:
1.Insert 4GB memory in mother board
2.Boot to FreeBSD
3.System will display two special prompts "BIOS 635kB/3143552kB available memory" and "1048576kB of memory above 4GB ignored" during I/O init.
4.After enter OS, we check the real/available memory by "dmesg command", the size is about 3GB.
>How-To-Repeat:
Please refer to above
>Fix:
      
>Release-Note:
>Audit-Trail:
>Unformatted: