Re: 2.6.22-rc1 does not boot on VIA C3_2 cause of X86_CMPXCHG64

[Dave Jones]

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

-- 
http://www.codemonkey.org.uk
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