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: [email protected]; [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: [email protected]; [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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