Ingo Molnar <mingo at elte.hu> writes: > * 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 ... As I recall that was how you went from 32bit mode to 16bit real mode. The issue is that mode never reset the hardware it simply changed the cpu mode. Eric
