On Wednesday 12 November 2008, H. Peter Anvin wrote: > Looking at doing the port CF9 fallback, I stumbled onto something fishy. > > I wonder if anyone here happens to have any idea why we turn off > caching in machine_real_restart()? Jumping to the BIOS is *not* a > reset; we jump to the decompressed BIOS on low memory which is usually > shadowed, not to the BIOS entry point. In that way, it's more of an > INIT than a reset, and disabling caching seems broken. > > Either way, here is a preliminary patch to do the CF9 if safe, and then > falling back to keyboard reboot. I'm a bit concerned about how to test > it, of course; this stuff is sensitive and just about impossible to test > except on millions of machines at once... > > If you have any machines (especially problematic ones) and find that > this patch either helps or hurts or do nothing, please do let me know so > I have any idea of the extent of coverage. > Works here both with default and reboot=p.
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