Messages in this thread | | | Date | Fri, 9 Jul 1999 19:27:55 +0200 (CEST) | From | willy tarreau <> | Subject | Re: KMSGDUMP: dump kernel messages to a diskette |
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--- Jamie Lokier <lkd@tantalophile.demon.co.uk> a écrit: > Willy Tarreau wrote: > > it must be the case because these functions were > designed exactly for > > that use, ie. jumping from protected to real mode > and execute a given > > code to eventually switch back to protected mode. > Normaly, only the > > CPU reset line is activated by an out 0x64,0xfe, > so nothing else > > should be lost on the motherboard. > > Though take a look at > arch/i386/kernel/proces.c:machine_restart() > -- out 0x64,0xfe does not work on some motherboards.
Yes, I know this problem, but the triple fault didn't work at all in my case, and I don't know why. The bios doesn't branch to the pointer at 40:67. But as stated before, the mail goal here is to try to catch a panic in *most* situations; there always be some situations in which it will not be possible. if some 486's can't dump the message, that doesn't prevent them from working perfectly the rest of the time.
> > (Strangely it _does_ work from DOS on the board I > tried).
Linus' comment says it doesn't work on some MB. I believe at least on UMC480 or SiS461 chipsets it doesn't work, but I don't remember well on what MB I encountered problems a long time ago.
> > -- Jamie > > Willy
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