Messages in this thread | | | From | Bodo Eggert <> | Subject | Re: > I even didn't have a backtrace. | Date | Mon, 29 Dec 2008 20:24:18 +0100 |
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Igor Podlesny <for.poige+linux@gmail.com> wrote: > 2008/12/29 Sitsofe Wheeler <sitsofe@yahoo.com>: >> Igor Podlesny wrote:
>>> BTW, I wonder -- can the kernel store crash related information (if >>> any) in RAM, at certain addresses, so it can survive warm reboot and >>> get displayed "in dmesg" on the next boot? >> >> Perhaps you are thinking of kdump - http://lwn.net/Articles/108595/ ? > > Similar, but no exactly. I just thought that unlikely BIOS erases > memory content during "fast checks", so kernel diagnostic could be > left at certain addresses, probably duplicated for safety, and newly > booted kernel could check if there were something left for it in RAM. > That's simpler than kdump/kexec, the question is only whether memory > is really left intact during BIOS work, at least partly.
You may want to read "ISA System Architecture By Tom Shanley, Don Anderson, John Swindle, MindShare, Inc"
http://books.google.com/books?id=iXE6mwUCNWQC&pg=PA110&lpg=PA112&ots=ZH_c88LEqd&dq=post+reset+flag+0072+0040&ie=ISO-8859-1&output=htmlhttp://books.google.com/books?id=iXE6mwUCNWQC&pg=PA112&lpg=PA112&dq=post+reset+flag+0072+0040&source=web&ots=ZH_c88LEqd&sig=3EbSpcxbKrPvd1ixhysJK4AuOrA&hl=en&sa=X&oi=book_result&resnum=1&ct=result
HTH.
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