* Ahmed S. Darwish <[email protected]> wrote:
> > Also, have you tried BIOS warm reset vector, which is supposed to reboot
> > without
> > clearing RAM contents - how well does it work in practice on typical
> > laptops? If
> > on crash we could reboot without memory getting cleared that would open up
> > a
> > vast area of space to store the kernel log into (RAM).
>
> AFAIK, the lmode->rmode transition is more forward-compatible.
>
> It seems the only place warm boot was documented is in the Intel MP spec, a
> 12-years old document long obsoleted by ACPI. Meanwhile, the real-mode
> transition
> is rigorously documented in the current Intel and AMD manuals, albeit in kind
> of a
> holier-than-thou approach.
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 ...
Thanks,
Ingo
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