Note: UEFI & PI are independent Interfaces.

The below picture get form http://nchc.dl.sourceforge.net/project/efidevkit/Member%20Documents/2009%20Beijing%20UEFI%20Training%20Stuff/102%20The%20framework%20Overview%20with%20UEFI-PI1-2.pdf , to see page 9

image

So UEFI Forum provide both PI and UEFI spec.

Normally an OEM BIOS enginee focus on to modify PI part, to meet the HW specificaiton and collection platform infomation. such as GPIO setting/special device initilization sequence/DMI(SMBIOS)/ACPI Tables …

Addition: PI SCT : Platform Initialization Self Certification Test

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