[PATCH 0/2][concept RFC] x86: BIOS-save kernel log to disk upon panic

Ingo Molnar mingo at elte.hu
Thu Jan 27 06:41:13 EST 2011

* H. Peter Anvin <hpa at zytor.com> wrote:

> On 01/26/2011 06:00 AM, Ingo Molnar wrote:
> >
> >I mean, use the warm reset vector to truly reset the box.
> >
> >Then, once a stable known-good kernel boots, *that* kernel can then recover all the
> >log data which is sitting in a well-known place in RAM, automatically and
> >transparently.
> >
> >Basically a bit like kexec, just more convenient and it also goes through the BIOS
> >warm reset, so it might work better than kexec ...
> >
> The problem is that the BIOS will often wipe memory.

Yes - but at least a long time ago there used to be modi of reboot when the BIOS did 
not do this. Whether that's possible at all with modern BIOSen is a big question ...



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