Re: How do I do a COLD Reboot on FreeBSD?
Bob Hall wrote: This may help. http://www.faqs.org/faqs/assembly-language/x86/general/part3/section-5.html Bob Hall Hmmm. Good link. Here's a better one that I just discovered reading about this stuff: http://unix.derkeiler.com/Mailing-Lists/FreeBSD/hackers/2003-11/0205.html I began to notice that the 0x472 code is rampant in these reboot assembler code examples. Then I found out that FreeBSD has its own asembly language found in the boot loaders, etc. OpenBSD and others like Linux use this stuff similarly. Linux seems to give you the option in a config file!! to cold reboot. So this led me to: /usr/src/sys/i386/i386/locore.s Which looks to me the place where a warm boot is guaranteed. By the way, the guy above (Adrian Steinmann) might have cleaned up the code for the btx (usr/src/sys/boot/i386/btx/btx/btx.S) in 2003. But his code cleanup never stayed in /usr/src/sys/boot/i386/boot2/boot1.S. Example from FreeBSD-5-stable: /usr/src/sys/boot/i386/btx/btx/btx.S has this: movw $0x1234, BDA_BOOT # Do a warm boot ljmp $0x,$0x0 # reboot the machine /usr/src/sys/boot/i386/boot2/boot1.S has the *better* version: movw $0x1234, BDA_BOOT # Do a warm boot ljmp $0xf000,$0xfff0# reboot the machine Anyway, Adrian Steinmann tried to patch the reboot code in btx.s to do some sort of bugfix and troubleshooting on his particular machine. There may have been a regresion here since he tried that, but I don't care much about the BTX or the boot1 code. My issue is for now with the reboot done during a normal full kernel running. That is when SMP code is active and the memory is being actively used. I believe the locore.s file is where I need to look, because it moves this 0x1234 data into the BDA_BOOT location, which is 0x427 in memory. Therefore, I will try to hack the locore.s file and use a zero instead of 0x1234 to move into memory at the BDA_BOOT location. here's my unified diff: -Code --- locore.sThu Jul 8 17:35:34 2004 +++ /usr/src/sys/i386/i386/locore.s Wed Feb 2 01:50:36 2005 @@ -214,7 +214,8 @@ movsb #else /* IBM-PC */ /* Tell the bios to warmboot next time */ - movw$0x1234,0x472 +/* movw$0x1234,0x472 */ +movw$0x,0x472 /* Billy: Perform Cold Reboot! */ #endif /* PC98 */ /* Set up a real frame in case the double return in newboot is executed. */ -Code The only substantial change is that I hope this make my machine do a cold reboot. Billy ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How do I do a COLD Reboot on FreeBSD?
On Monday 31 January 2005 19:24, Billy Newsom wrote: Xian wrote: On Monday 31 January 2005 18:53, Billy Newsom wrote: When you flash your BIOS from DOS, it will usually do a cold reboot when it exits. Does the dos reboot command work? If it does, I'm sure I could dig up a copy of it from one of my disks. I don't know if it is possible to hack the code out that actually does the reboot No, because reboot is basically the same as shutdown -r now. I've done both to no avail. Technically, the shutdown command calls either the reboot or halt commands. I was meaning the reboot command in DOS not FreeBSD -- /Xian A man's ethical behaviour should be based effectually on sympathy, education, and social ties; no religious basis is necessary. Man would indeeded be in a poor way if he had to be restrained by fear of punishment and hope of reward after death. Albert Einstein ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How do I do a COLD Reboot on FreeBSD?
Xian wrote: Does the dos reboot command work? If it does, I'm sure I could dig up a copy of it from one of my disks. I don't know if it is possible to hack the code out that actually does the reboot No, because reboot is basically the same as shutdown -r now. I've done both to no avail. Technically, the shutdown command calls either the reboot or halt commands. I was meaning the reboot command in DOS not FreeBSD Oh, yeah. I could try that. I could boot an old DOS 6.2 or whatever and try CTRL-ALT-DELETE. I think that is what you mean. I don't remember that actual command, although I'm sure there's a lot of third-party reboot commands... Some of which I'd like to see in the assembler code, myself. I'll just bet someone has an old MS-DOS BASIC program or assembler written in C, Pascal, or something, which could do a warm or cold reset. Billy ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How do I do a COLD Reboot on FreeBSD?
Billy Newsom wrote: Oh, yeah. I could try that. I could boot an old DOS 6.2 or whatever and try CTRL-ALT-DELETE. I think that is what you mean. I don't remember that actual command, although I'm sure there's a lot of third-party reboot commands... Some of which I'd like to see in the assembler code, myself. I'll just bet someone has an old MS-DOS BASIC program or assembler written in C, Pascal, or something, which could do a warm or cold reset. Well, I just tried a Windows 98 Startup disk. I booted to floppy, and then hit CTRL-alt-delete. Guess what? This system did a warm reboot, I removed the floppy, and FreeBSD booted from the hard disk perfectly. So I have to come to this conclusion: something in the FreeBSD 5-Stable code has made this machine break anytime it performs a halt followed by a power cycle, or a reboot followed by a power cycle (since the reboot always fails). My surmise is that the new SMP code has somehow done some sort of corruption to the CPU state(s) and the BIOS is somehow confused during the attempted reboot. 0. System has passed every diagnostic I can throw at it. Everything checks out during normal operation. Dual processor Pentium Pro. DOS, Windows, and FreeBSD 4.7 with SMP do not have this problem. Latest 5-Stable code from 1/30/2005. 1. I type shutdown -r now or reboot. This shows the normal cpu_reset stuff, and then the system beeps and hangs. (a memory error beep code saying the first 64KB are bad.) If I turn power off and back on, the system bypasses its memory check in POST and crashes on next boot. 2. I type shutdown now, followed by halt in single user mode. This puts me at the press any key to reboot screen. If I press a key, system won't reset, and gives a memory error beep code saying the first 64KB are bad. If I turn power off and back on, (no matter if I tried the reboot or not) the system bypasses its memory check in POST and crashes on next boot. 3. I must turn power off and unplug the cord usually. Then, on subsequesnt boot, the memory will be tested during POST and FreeBSD boots normally. 4. None of these problems appear after a DOS warm boot on this machine. 5. I'm looking for a cold reboot utility to patch the kernel or the reboot command of FreeBSD 5.3. 6. I recompiled the kernel with the BROKEN_KEYBOARD_RESET option. The reboot hangs and system does not reboot, but the beep codes aren't there. I suppose that the BROKEN_KEYBOARD_RESET style reboot (I saw the source code and thought I'd try it) does not work. Again, when I power cycle the machine, the POST is still a short POST (and the kernel crashes when loading) and so I must disengage the power cable as above. Billy ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How do I do a COLD Reboot on FreeBSD?
This may help. http://www.faqs.org/faqs/assembly-language/x86/general/part3/section-5.html Bob Hall ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How do I do a COLD Reboot on FreeBSD?
I am not completely sure... but from what i know bout a COLD Reboot: just unplug the power cable. that exactly does what a COLD Reboot does. Greetings Oliver Leitner Technical Staff http://www.shells.at On Monday 31 January 2005 15:31, Billy Newsom wrote: I need to do a cold restart. I've looked through a lot of docs, and I can't seem to find this out. The computer I am working with seems to no longer enjoy a warm reboot (like shutdown -r now or reboot) but I'm pretty sure it will do cold reboots fine. Is there a port, or is the shutdown command hackable for this, or what? I remember many computers in bygone years which had this problem. It was pretty common back in the 90's it seems like. Computers would reboot and act weird using CTRL-ALT-DELETE, but work fine when powered off and on. The computer I've got actually fails a memory test during the warm reboot. This freezes it. I have to power cycle the machine. And then, the computer performs a warm restart, bypassing its memory checks! One more power cycle laster, it will boot normally. If I don't do this last reboot, the FreeBSD boot loader or the beginning of the kernel boot crashes very early. It's stable otherwise on a cold reboot. Thanks, Billy ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] -- By reading this mail you agree to the following: using or giving out the email address and any other info of the author of this email is strictly forbidden. By acting against this agreement the author of this mail will take possible legal actions against the abuse. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How do I do a COLD Reboot on FreeBSD?
On Tue, 1 Feb 2005 01:01 am, Billy Newsom wrote: I need to do a cold restart. I've looked through a lot of docs, and I can't seem to find this out. The computer I am working with seems to no longer enjoy a warm reboot (like shutdown -r now or reboot) but I'm pretty sure it will do cold reboots fine. Is there a port, or is the shutdown command hackable for this, or what? Try the man page for 'shutdown'. # shutdown -h now will cause a controlled shutdown finishing with a message to press any key to reboot. At this stage you can switch off. If your computer supports programmed power off then you can also use: # shutdown -p now which will end with powering down your machine. I remember many computers in bygone years which had this problem. It was pretty common back in the 90's it seems like. Computers would reboot and act weird using CTRL-ALT-DELETE, but work fine when powered off and on. Yes I've also experienced this. I always suspected it was one or other peripheral device that is only reset on power down; but I really don't have any justification for this assumption. Malcolm ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How do I do a COLD Reboot on FreeBSD?
I need to do a cold restart. I've looked through a lot of docs, and I can't seem to find this out. The computer I am working with seems to no longer enjoy a warm reboot (like shutdown -r now or reboot) but I'm pretty sure it will do cold reboots fine. Is there a port, or is the shutdown command hackable for this, or what? I remember many computers in bygone years which had this problem. It was pretty common back in the 90's it seems like. Computers would reboot and act weird using CTRL-ALT-DELETE, but work fine when powered off and on. FreeBSD is pretty good about doing a very clean reboot as far as the OS is concerned. But, it is possible that some devices don't clean up well in ways that are out of FreeBSD control.So, a cold boot can be a good idea in some circumstances. To do this, do a 'shutdown -h now' or a 'shutdown -p now' if your hardware supports the -p and you have it set up. Choose your own time of delay for 'now' if you have other people on the machine. If you did the '-h' or the '-p' didn't turn off the power, then at the press any key to reboot prompt, turn off the power. Then, unplug the power source and let it set for a few minutes to let any charge dissipate. This can be important because the capacitance in some of the devices including the power supply can provide just enough charge to keep them from reloading if that is their inclination and you lose the effect you are looking for. You should also unplug the network connection and any external devices that have their own power supply. After a sufficient time drain capacitance - I usually go to the bathroom or go get something to drink to kill a few minutes - , then just plug it all back in. Plug in the network cable and any external devices first and then the power cord and turn it on and let it boot. Voila, you have gone from warm to cold to warm again. jerry The computer I've got actually fails a memory test during the warm reboot. This freezes it. I have to power cycle the machine. And then, the computer performs a warm restart, bypassing its memory checks! One more power cycle laster, it will boot normally. If I don't do this last reboot, the FreeBSD boot loader or the beginning of the kernel boot crashes very early. It's stable otherwise on a cold reboot. Thanks, Billy ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How do I do a COLD Reboot on FreeBSD?
Oliver Leitner wrote: I am not completely sure... but from what i know bout a COLD Reboot: just unplug the power cable. that exactly does what a COLD Reboot does. Yep, you are techically right, but of course, I asked how to do this from the operating system, in this case FreeBSD. Many diagnostic disks and ROM burning floppy disks do a cold reset from software, just as some examples. This code is available, but I need to do this remotely, from 3000 miles away, or tell someone how to do it over the phone, or write it on a napkin glued to the monitor (aka sticky note) for a clueless user who happens to be near the box, etc. And personally, I would rather not disengage the power cord. The target look and feel will be to type rebootme and see the video card BIOS screen, followed by memory counting, etc. and the POST. Right now, typing reboot eventually just crashes the system after the CPU's are halted. I will probably need to hack the kernel source to do the disk syncing and other stuff which shutdown/reboot do. Billy On Monday 31 January 2005 15:31, Billy Newsom wrote: I need to do a cold restart. I've looked through a lot of docs, and I can't seem to find this out. The computer I am working with seems to no longer enjoy a warm reboot (like shutdown -r now or reboot) but I'm pretty sure it will do cold reboots fine. Is there a port, or is the shutdown command hackable for this, or what? I remember many computers in bygone years which had this problem. It was pretty common back in the 90's it seems like. Computers would reboot and act weird using CTRL-ALT-DELETE, but work fine when powered off and on. The computer I've got actually fails a memory test during the warm reboot. This freezes it. I have to power cycle the machine. And then, the computer performs a warm restart, bypassing its memory checks! One more power cycle laster, it will boot normally. If I don't do this last reboot, the FreeBSD boot loader or the beginning of the kernel boot crashes very early. It's stable otherwise on a cold reboot. Thanks, Billy ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How do I do a COLD Reboot on FreeBSD?
Jerry McAllister wrote: I need to do a cold restart. I've looked through a lot of docs, and I can't seem to find this out. The computer I am working with seems to no longer enjoy a warm reboot (like shutdown -r now or reboot) but I'm pretty sure it will do cold reboots fine. Is there a port, or is the shutdown command hackable for this, or what? I remember many computers in bygone years which had this problem. It was pretty common back in the 90's it seems like. Computers would reboot and act weird using CTRL-ALT-DELETE, but work fine when powered off and on. FreeBSD is pretty good about doing a very clean reboot as far as the OS is concerned. But, it is possible that some devices don't clean up well in ways that are out of FreeBSD control.So, a cold boot can be a good idea in some circumstances. To do this, do a 'shutdown -h now' or a 'shutdown -p now' if your hardware supports the -p and you have it set up. Choose your own time of delay for 'now' if you have other people on the machine. If you did the '-h' or the '-p' didn't turn off the power, then at the press any key to reboot prompt, turn off the power. Then, unplug the power source and let it set for a few minutes to let any charge dissipate. This can be important because the capacitance in some of the devices including the power supply can provide just enough charge to keep them from reloading if that is their inclination and you lose the effect you are looking for. You should also unplug the network connection and any external devices that have their own power supply. I know that this is all very good advice and information from the shutdown man page and good stuff about the nature of capacitors, but all of this is known to myself and unfortunately not useful... The shutdown -p does essentially a different thing (and one time it caused the freeze problem to disappear.) but this also does not work. I don't want to shut the computer off, anyway, I want it to reboot back to FreeBSD remotely if need be. And so far, the halt command (or its shutdown -h equivalent) is not what I want, either. If I press a key to reboot, I get the same issue anyway. There's a remote possibility that the halt code is causing the freeze up, because FreeBSD 4.7 did not have this problem. I'm not confident whether the machine broke or the new 5.3 code broke, so I won't speculate which. I just need the reboot code. ... After a sufficient time drain capacitance - I usually go to the bathroom or go get something to drink to kill a few minutes - , then just plug it all back in. Plug in the network cable and any external devices first and then the power cord and turn it on and let it boot. It's not the capacitors, but perhaps some strange bug in the BIOS or something, I guess. The issue that I'm highlighting is that when a floppy program does a cold reset of this machine, the system (re)boots normally. As a side note, I have run this machine through the ringer trying to discover any hardware errors. The memory is now EDO ECC (it had been something else) and the problem persists. I have run diagnostics, memtest86, etc. Futile. The cold reset code exists somewhere. Anybody? Billy Voila, you have gone from warm to cold to warm again. jerry The computer I've got actually fails a memory test during the warm reboot. This freezes it. I have to power cycle the machine. And then, the computer performs a warm restart, bypassing its memory checks! One more power cycle laster, it will boot normally. If I don't do this last reboot, the FreeBSD boot loader or the beginning of the kernel boot crashes very early. It's stable otherwise on a cold reboot. Thanks, Billy ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How do I do a COLD Reboot on FreeBSD?
Jerry McAllister wrote: I need to do a cold restart. I've looked through a lot of docs, and I can't seem to find this out. The computer I am working with seems to no longer enjoy a warm reboot (like shutdown -r now or reboot) but I'm pretty sure it will do cold reboots fine. Is there a port, or is the shutdown command hackable for this, or what? I remember many computers in bygone years which had this problem. It was pretty common back in the 90's it seems like. Computers would reboot and act weird using CTRL-ALT-DELETE, but work fine when powered off and on. FreeBSD is pretty good about doing a very clean reboot as far as the OS is concerned. But, it is possible that some devices don't clean up well in ways that are out of FreeBSD control.So, a cold boot can be a good idea in some circumstances. To do this, do a 'shutdown -h now' or a 'shutdown -p now' if your hardware supports the -p and you have it set up. Choose your own time of delay for 'now' if you have other people on the machine. If you did the '-h' or the '-p' didn't turn off the power, then at the press any key to reboot prompt, turn off the power. Then, unplug the power source and let it set for a few minutes to let any charge dissipate. This can be important because the capacitance in some of the devices including the power supply can provide just enough charge to keep them from reloading if that is their inclination and you lose the effect you are looking for. You should also unplug the network connection and any external devices that have their own power supply. I know that this is all very good advice and information from the shutdown man page and good stuff about the nature of capacitors, but all of this is known to myself and unfortunately not useful... The shutdown -p does essentially a different thing (and one time it caused the freeze problem to disappear.) but this also does not work. I don't want to shut the computer off, anyway, I want it to reboot back to FreeBSD remotely if need be. And so far, the halt command (or its shutdown -h equivalent) is not what I want, either. If I press a key to reboot, I get the same issue anyway. There's a remote possibility that the halt code is causing the freeze up, because FreeBSD 4.7 did not have this problem. I'm not confident whether the machine broke or the new 5.3 code broke, so I won't speculate which. I just need the reboot code. ... After a sufficient time drain capacitance - I usually go to the bathroom or go get something to drink to kill a few minutes - , then just plug it all back in. Plug in the network cable and any external devices first and then the power cord and turn it on and let it boot. It's not the capacitors, but perhaps some strange bug in the BIOS or something, I guess. The issue that I'm highlighting is that when a floppy program does a cold reset of this machine, the system (re)boots normally. 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. Another small guess - are you looking for 'shutdown -r now' by any chance? If you want something else, you will need to explain that. Who knows if anyone will know what to do about that - at least not until you reveal what it is. jerry As a side note, I have run this machine through the ringer trying to discover any hardware errors. The memory is now EDO ECC (it had been something else) and the problem persists. I have run diagnostics, memtest86, etc. Futile. The cold reset code exists somewhere. Anybody? Billy Voila, you have gone from warm to cold to warm again. jerry The computer I've got actually fails a memory test during the warm reboot. This freezes it. I have to power cycle the machine. And then, the computer performs a warm restart, bypassing its memory checks! One more power cycle laster, it will boot normally. If I don't do this last reboot, the FreeBSD boot loader or the beginning of the kernel boot crashes very early. It's stable otherwise on a cold reboot. Thanks, Billy ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How do I do a COLD Reboot on FreeBSD?
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. Another small guess - are you looking for 'shutdown -r now' by any chance? No, it fails. If you want something else, you will need to explain that. Who knows if anyone will know what to do about that - at least not until you reveal what it is. The revelation is at hand. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How do I do a COLD Reboot on FreeBSD?
On Monday 31 January 2005 18:53, Billy Newsom wrote: When you flash your BIOS from DOS, it will usually do a cold reboot when it exits. Does the dos reboot command work? If it does, I'm sure I could dig up a copy of it from one of my disks. I don't know if it is possible to hack the code out that actually does the reboot -- /Xian Artificial Intelligence is no match for Natural Stupidity unknown author ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How do I do a COLD Reboot on FreeBSD?
Xian wrote: On Monday 31 January 2005 18:53, Billy Newsom wrote: When you flash your BIOS from DOS, it will usually do a cold reboot when it exits. Does the dos reboot command work? If it does, I'm sure I could dig up a copy of it from one of my disks. I don't know if it is possible to hack the code out that actually does the reboot No, because reboot is basically the same as shutdown -r now. I've done both to no avail. Technically, the shutdown command calls either the reboot or halt commands. Billy ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
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]
RE: How do I do a COLD Reboot on FreeBSD?
-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 (: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]
Re: How do I do a COLD Reboot on FreeBSD?
According to Bart Silverstrim: 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. It's been a long time, but it seems to me the byte at absolute address 0x412 (labelled MFG_TST in the old ibm bios listing) determines whether the bios does a full POST or not. If that value is nulled out before the reboot, I think it will do a full POST. Rich ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
