Messages in this thread | | | Date | Thu, 17 May 2007 02:17:08 -0400 | From | Dave Jones <> | Subject | Re: 2.6.22-rc1 does not boot on VIA C3_2 cause of X86_CMPXCHG64 |
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On Wed, May 16, 2007 at 08:16:11PM -0700, Linus Torvalds wrote: > > > On Wed, 16 May 2007, H. Peter Anvin wrote: > > > > It gets turned on by the code in arch/i386/kernel/cpu. It's just that > > the new code that Andi added runs during setup, i.e. in real mode, so > > *way* earlier than that. > > Ahh. Do we really need it that early? > > Now, it's easy enough to just turn off CONFIG_X86_CMPXCHG64 (it really > should be "8B" instead of "64", but that's another issue) for those > things, and nobody should really care, but still, maybe we could re-do the > early bits to be more polite to those VIA CPU's? > > I thought the cmpxchg8b stuff was just used to page table setup. Do those > things even _support_ PAE?
newer models do, yes. Even NX. In fact, primarily for NX. I've not heard of anyone running >4GB with a Nehemiah.
Dave
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