> Physical Address Extensions (PAE) 32-bit is available.
If the pae flag is not present in /proc/cpuinfo then PAE is not enabled
on your particular CPU, even if it is available for other CPUs in the
same family. The CPU indicates PAE support (or not) in the result of the
CPUID instruction, which is hardcoded in the processor microcode.
> Are there any adverse effects known about the boot parameter
"forcepae"?
I have not seen any reports of adverse effects, but given the small
number of users and non-extensive testing it is possible.
> If that is so, then the PAE flag can be set / forced without problems.
afaik those errata would not be a problem as Linux does not use PAT on
Pentium M, and the TLB is cleared on init. But there may be other issues
or internal errata that Intel hasn't published. Nobody knows why Intel
disabled PAE for these processors. As the docs say:
forcepae [X86-32]
Forcefully enable Physical Address Extension (PAE).
Many Pentium M systems disable PAE but may have a
functionally usable PAE implementation.
Warning: use of this parameter will taint the kernel
and may cause unknown problems.
The CPU is run out-of-spec so there are no guarantees. If this is not
acceptable then the next easiest workaround is to compile your own
kernel with PAE disabled (CONFIG_X86_PAE=n).
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https://bugs.launchpad.net/bugs/1307105
Title:
Kernel install fails due PAE checks
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