Hi,

Linked to from the Launchpad bug report

https://bugs.launchpad.net/bugs/930447

--- start quote ---
Date    Tue, 25 Feb 2014 13:01:47 +0700
From    Chris Bainbridge <>
Subject [PATCH] x86: set Pentium M as PAE capable
        

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

Signed-off-by: Chris Bainbridge <chris.bainbri...@gmail.com>

---
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index bbe1b8b..97996aa 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -226,6 +226,12 @@ static void intel_workarounds(struct cpuinfo_x86 *c)
                clear_cpu_cap(c, X86_FEATURE_SEP);

        /*
+        * PAE CPUID bug: Pentium M reports no PAE but has PAE
+        */
+       if ((c->x86 == 6) && ((c->x86_model == 9) || (c->x86_model == 13)))
+               set_cpu_cap(c, X86_FEATURE_PAE);
+
+       /*
         * P4 Xeon errata 037 workaround.
         * Hardware prefetcher may cause stale data to be loaded into the cache.
         */
--- end quote ---

I think and hope this indicates, that we'll get a standard Trusty Tahr
kernel, that can be installed in Pentium M computers without fake-PAE.

Best regards
Nio

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