Messages in this thread | | | Date | Tue, 25 Feb 2014 07:06:55 -0500 | From | Peter Hurley <> | Subject | Re: [PATCH] x86: set Pentium M as PAE capable |
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On 02/25/2014 05:45 AM, H. Peter Anvin wrote: > On 02/24/2014 10:01 PM, Chris Bainbridge wrote: >> Pentium M is PAE capable but does not indicate so in the CPUID response. >> This is an issue now that some distributions are no longer shipping >> non-PAE kernels (those distributions no longer boot on Pentium M). This >> small patch fixes the issue by forcing the PAE capability on Pentium M. >> >> For more discussion see https://bugs.launchpad.net/baltix/+bug/930447 >> > > 1. This patch doesn't match the discussion in the link. > 2. You would have to also enable this in the cpu testing code in > arch/x86/boot. > 3. At the very least we need to print a serious warning that the CPU > is being run outside its specifications. I have no personal > information about why this CPUID bit was disabled, but it could be > that it was discovered in testing that it didn't work correctly in > all circumstances (e.g. high temperature.) This is very much "use > at your own risk..."; you could get data corruption or even > hardware damage. > > We should probably also taint the kernel.
Perhaps obviously, this should require either command line or build opt-in.
Regards, Peter Hurley
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