lkml.org 
[lkml]   [2007]   [May]   [17]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateWed, 16 May 2007 21:51:36 -0700
From"H. Peter Anvin" <>
SubjectRe: 2.6.22-rc1 does not boot on VIA C3_2 cause of X86_CMPXCHG64
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?

The reason to do it early is so that we can still get a message out if
the CPU doesn't have the necessary features.  This is generic code and
not specific to CX8.

Since I'm rewriting the setup code in C, I have added code to enable
features on VIA and Transmeta CPUs (there was already code in there to
enable features on AMD; Intel isn't known to hide any features other
than PAE on 400 MHz FSB Pentium-M.)

I think the early feature detection makes good sense.  It's a heckuva
lot nicer to get a message on your screen saying that you can't boot
this kernel on this CPU than a crash, or an early_printk which may never
actually get to you.

	-hpa
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-05-17 04:55    [from the cache]
©2003-2008