-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bart Silverstrim Sent: Monday, January 31, 2005 3:30 PM To: Billy Newsom Cc: freebsd-questions@freebsd.org Subject: Re: How do I do a COLD Reboot on FreeBSD?
On Jan 31, 2005, at 1:53 PM, Billy Newsom wrote: > Jerry McAllister wrote: >> Well, I guess I completely do not understand what you are asking. >>> From anything I can get from what you write here, its behavior is >> normal and expected. What is the problem and what are you trying to >> fix or to get it to do? >> A cold boot - which is what you ask about in your original post - is >> a boot all the way up from a powered off machine as far as I know. >> So, all I did was explain how to get what you asked for in the post. > > No, I said a cold reboot. That's the term for a reboot which runs the > entire POST, counts memory, etc. The screen looks identical to a cold > start or cold boot. We all know what the warm reboot means -- that's > when many parts of the POST are skipped. Windows uses a cold reboot, > for example, when you click "Restart" on the Shutdown menu. FreeBSD > does a warm reboot using the reboot command. The warm reboot may save > thirty to sixty seconds over the cold reboot. A warm reboot typically > skips the memory check and does a cursory check of hard drive > parameters, etc. to save time. > > If you use a PC DOCTOR disk and tell it to reboot, it will do a cold > reboot. When you flash your BIOS from DOS, it will usually do a cold > reboot when it exits. When you save changes and reboot from the BIOS > setup screen, it will do a cold reboot. Many other examples are > possible. > > What I tried to explain is that this PC crashes on the subsequent boot > if a warm reboot is performed by FreeBSD. But if I could perform a > cold reboot every time, this would solve the issue. A cold reboot is > not the act of "shutting the power off and turning it back on." That > is called a power cycle and it is obviously manual. A cold reboot is > done by a special software command. > >I was always told a cold reboot comes from powering down the system; minimal power to the logic board and wiping any and all traces >possible (short of unplugging it) of random crap in the capacitors and memory. >Literally cold boot because usually it happened after powering it down and it would cool off until the user came back to work on their >computer for awhile. > >Warm boots basically just cycle the computer to restart the OS. It's just restarting it, and power to the components has been >maintained the whole time so as far as the computer hardware is concerned nothing really happened, just a chunk of memory access and the >processor mode getting kicked around a bit. > >_______________________________________________ >freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions >To unsubscribe, send any mail to "[EMAIL PROTECTED]" Okay, you're all mostly correct. For more info, see this page: http://ironbark.bendigo.latrobe.edu.au/subjects/int11ct/2004/L17/lecture.htm l Now, as for how to get FreeBSD to set this area in memory (0000:0472h) set with the something other than 1234h, I'd imagine a simple assembler job could do it. Seems right up assemblers alley. It's been a while since I've done anything outside of C, but I'll see what I can whip up. - Niy _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
