Multi-core initialization

[Thimpu]

I am on an NUC8i5BEK. My question is related to multicore initialization in BIOS. If I enable only one physical core in the BIOS and want to enable the cores later using a UEFI application, would that be possible? or once disabled in the bios setup and rebooted, the offline cores are out of the user's reach?

[n_scott_pearson]

I believe that they are out of the user reach until you go back into BIOS Setup and reenable the other cores.

...S

[Thimpu]

Thank you for the reply. I am trying to learn OS design. Does UEFI and system firmware already initialize APs or this task is left to the kernel? When I am in the UEFI environment,  do I have all the cores ready to run the kernel or they are in a wait-for-sipi-state when BSP already loads the kernel?

[Steven_Intel]

Hello Thimpu,

Thank you for posting on the Intel® communities.

I will research that information. As soon as I have an update, I will let you know.

Best regards,

Steven G.

Intel Customer Support Technician.

[Steven_Intel]

Hello Thimpu,

Due to the nature of your request, OS design is out of our scope, therefore, our best recommendation is to visit OS design forums for further information.

Please keep in mind that this thread will no longer be monitored by Intel. Thank you for your understanding.  

Best regards,

Steven G.

Intel Customer Support Technician.