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 isnormal 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.
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