In x86 assembly, there is no directive that I know of to select a different core. I'm afraid it might have to be performed with a call to a seperate module. I really don't know... But I think the other 3 cores may get addressed by APIC directives...
To do the mod I did, I wrote a substitute PCI LAN Boot ROM and replaced the original. The new ROM writes to the MSR when it's executed and that is when the LAN Boot is enabled during POST....




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