i386/93438: Freebsd reboot by "shutdown -r now" cause damage CMOS.

[Victor Blood]

>Number:         93438
>Category:       i386
>Synopsis:       Freebsd reboot by "shutdown -r now" cause damage CMOS.
>Confidential:   no
>Severity:       non-critical
>Priority:       high
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Feb 16 17:00:18 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Victor Blood
>Release:        FreeBSD 4.10 RELEASE
>Organization:
>Environment:
>Description:
Reboot machine, using "shutdown -r" instruction cause damage CMOS. After CPU restart I have a note, that "CMOS checksum failed, defaults loaded". The Windows95, Ms-DOS and compaq Setup diskette are reboot computer normaly, without cause damege to CMOS. Then CMOS resets to defaults, setting for date/time and  periphery ara stay good, but other such as: "Non-dos partition" option set are loaded from defaults.

Machine: Compaq deskpro 466 model, i486-DX2 processor,
video: S3 trio64, embedded video is disabled in bios.
>How-To-Repeat:
after rebooting by instruction: shutdown -r now 
>Fix:
search, search, but can't find problem-solving...
>Release-Note:
>Audit-Trail:
>Unformatted: