Attention is currently required from: Arthur Heymans.
Kyösti Mälkki has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/67239 )
Change subject: cpu/x86/lapic.h: Fix CONFIG_X2APIC_RUNTIME ......................................................................
Patch Set 1:
(1 comment)
Commit Message:
https://review.coreboot.org/c/coreboot/+/67239/comment/aab3d4b6_fe90a7ba PS1, Line 10: the cpu is in x2apic mode.
CB:60213 tries to explain the X2APIC_ONLY case. […]
Equivalent of the kernel code segment in coreboot tree is send_ipi_to_aps(), and even after your suggested change there is no similar 10us delay after Startup IPI sent to APs in coreboot tree. The referenced kernel code segment is unrelated to the suggested code change.
Anyways, I would have liked to see a log of the failure and know if the problem appeared with DEBUG_SMI=y or =n.