The BIOS Fault-Resilient-Boot timer, the BIOS OS-Watchdog timer, and the
IPMI watchdog timer, are all using the same physical timer, but cover
different phases of boot.  
  BIOS FRB covers power-on through POST, 
  BIOS OS covers POST to OS running, 
  IPMI covers while the OS is running.  
Each of should set up the timer when it initializes.  
 
Andy

________________________________

From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On
Behalf Of Won De Erick
Sent: Sunday, August 10, 2008 9:34 PM
To: [EMAIL PROTECTED]
Cc: freeipmi-devel@gnu.org; [EMAIL PROTECTED]
Subject: [Freeipmi-devel] Re: [Freeipmi-users] bmc-watchdog and the
OSwatchdog in BIOS


Hi Al,

Thanks for your reply. Yes, I think this is a protection to the BIOS
(not normally writable) so as not to let malicious progs to easily
change the settings.

Thanks,

Won



----- Original Message ----
From: Al Chu <[EMAIL PROTECTED]>
To: Won De Erick <[EMAIL PROTECTED]>
Cc: freeipmi-devel@gnu.org; [EMAIL PROTECTED]
Sent: Sunday, August 10, 2008 8:49:45 PM
Subject: Re: [Freeipmi-users] bmc-watchdog and the OS watchdog in BIOS

Hey Won,

I cannot speak for your particular hardware.  I'm not sure if there is a
separate independent hardware watchdog.  

I can say, the settings you make with bmc-watchdog may not survive
across a system reboot.  It's very possible that after a system reboot,
the BIOS resets the watchdog values back to the system default, no 
matter what you previously configured.

Al

On Fri, 2008-08-08 at 18:11 -0700, Won De Erick wrote:
> Hi All,
> 
> We've tried installing the bmc-watchdog utility in IBMx343 running
FreeBSD. We've found out that it can interact with the built-in
management processor. When the timer was set to 1 minute using
bmc-watchdog -s command, the system restarted after the specified time.
But this setting did not change the OS watchdog timer that was
pre-configured using the BIOS utility. How are these two differ from
each other?
> 
> I've learned some known issues on using bmc-watchdog as specified in
the following:
> http://www.gnu.org/software/freeipmi/manpages/man8/bmc-watchdog.8.html
> 
> Setting the watchdog timer on the user space is incomparable with an
independent hardware watchdog (is this the case of the built-in
management processor on the IBM x343 box?). Hope to receive some lights
from all.
> 
> Thanks,
> 
> Won
> 
> 
>      
> _______________________________________________
> Freeipmi-users mailing list
> [EMAIL PROTECTED]
> http:// lists.gnu.org/mailman/listinfo/freeipmi-users
> 
-- 
Albert Chu
[EMAIL PROTECTED]
925-422-5311
Computer Scientist
High Performance Systems Division
Lawrence Livermore National Laboratory



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