>>> When the kernel is hung, almost all I/O hangs with it.
>>
>> So figure out a way to keep PC BIOS from mangling ram on hard reset.
>> Then dump to swap from lilo or something.
>
> You have code to do this? The BIOS bit that is, if you know a method
> for stopping a BIOS clearing memory that works on a reasonable set of
> motherboards then please tell us.
What about the 286-era return to real-mode feature? Since the 286
could not go back to real-mode without a reset, IBM added a way to
let software in RAM regain control after a processor reset. You need
to write the address of your code into the "CMOS RAM" chip.
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