Messages in this thread |  | | Date | Wed, 6 Dec 2000 11:16:54 +0100 (CET) | From | Kai Germaschewski <> | Subject | Re: That horrible hack from hell called A20 |
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On Tue, 5 Dec 2000, Linus Torvalds wrote:
> On Wed, 6 Dec 2000, Kai Germaschewski wrote: > > > > > On Tue, 5 Dec 2000, H. Peter Anvin wrote: > > > > > If you have had A20M# problems with any kernel -- recent or not -- > > > *please* try this patch, against 2.4.0-test12-pre5: > > > > Just a datapoint: This patch doesn't fix the problem here (Sony > > PCG-Z600NE). Still the spontaneous reboot exactly the moment I expect to > > get my console back from resumeing.
First of all, I tested removing the "or $2" in hpa's patch. That made resume work. Then, putting back the "or" but removing the "and $0xfe" had no effect at all (i.e. resume -> reboot).
I suppose not setting bit 1 made fast A20 enable not succeed, so kbc A20 was used -> resume works fine.
With setting bit 1 and with or w/o clearing bit 0, fast A20 enable seems to succeed -> kbc A20 is not used -> resume reboots.
> Want to bet $5 USD that suspend/resume saves the keyboard A20 state, but > does NOT save the fast-A20 gate information?
I suppose I'ld loose that bet.
> So anything that enables A20 with only the fast A20 gate will find that > A20 is disabled again on resume. > > Which would make Linux _really_ unhappy, needless to say. Instant death in > the form of a triple fault (all of the Linux kernel code is in the 1-2MB > area, which would be invisible), resulting in an instant reboot.
Makes sense to me.
test12-pre6 now works perfectly :-)
--Kai
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