if i remember correctly, this programming sequence requirement was from cannon-lake onwards. skylake/kabylake can still use native (coreboot) sgx init flow.

From cannon-lake onwards, sgx init needs fsp for the reasons mentioned in https://review.coreboot.org/c/coreboot/+/36356/2/src/soc/intel/cannonlake/finalize.c#116. i guess mp-ppi may also be used for cannon-lake onwards. Please follow Nate's recommendation for that.

PS: I see my gmail was added earlier and that notification was in spam. Thanks for adding my @intel email. I am off next week, I’ll respond the following week if there are follow-up questions.

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