[coreboot] Disabling hyper-threading on Ivy Bridge

Davíð Steinn Geirsson david at dsg.is
Sat Jan 13 15:34:32 CET 2018


Hi all,

Can someone advise on how logical/physical processors are numbered
for Ivy Bridge CPUs?

I am hoping to build coreboot with hyper-threading (SMT) disabled. I
guess this can be done by skipping over the right processor IDs in
the for loop in intel_cores_init in
src/cpu/intel/model_206ax/model_206ax_init.c:470 ?

But do I skip over odd numbers? even numbers? Or are the extra threads
at the end of the sequence?

Best regards,
Davíð




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