Messages in this thread | | | Date | Mon, 13 Apr 2009 09:27:20 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [tip:x86/setup] x86, setup: "glove box" BIOS calls -- infrastructure |
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Ingo Molnar wrote: >> Yes, we could do memory checks, and ... hey, we already do that: >> >> bb577f9: x86: add periodic corruption check >> 5394f80: x86: check for and defend against BIOS memory corruption >> >> ... and i seem to be the one who implemented it! ;-) > > s/implemented/merged+fixed :-)
Actually, what would probably be more productive than trying to track corruption would be to drop the low 1 MB of memory before suspend to RAM - make sure that it is as close to completely unused as possible.
All *known* cases of low memory corruption are either boot time or due to s2ram.
I don't know how realistic it is to make the low 1 MB completely unused over the s2ram cycle. The trivial way of doing it is to simply not use it -- it's only some 600K after all; a more sophisticated way would be to explicitly constrain it to transient uses that would be dead at s2ram.
-hpa
-- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.
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