Change in coreboot[master]: util/cbftool: Fix the bug in parsing Uefipayload with extended header

[Paul Menzel (Code Review)]

Attention is currently required from: Patrick Rudolph, Dun Tan.
Paul Menzel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/57296 )

Change subject: util/cbftool: Fix the bug in parsing Uefipayload with extended header
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Patch Set 3:

(5 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/57296/comment/6cddf87a_b7146ee8 
PS3, Line 7: Fix the bug
Fix bug

https://review.coreboot.org/c/coreboot/+/57296/comment/6ca1d04c_659b6a9c 
PS3, Line 7: cbftool
cbfstool

https://review.coreboot.org/c/coreboot/+/57296/comment/455d85c0_22a4c6e6 
PS3, Line 7: Uefipayload
UefiPayload

https://review.coreboot.org/c/coreboot/+/57296/comment/baafd061_7421730c 
PS3, Line 9: The patch is to fix "Not a usable UEFI firmware volume" issue when
           : creating CBFS/flash image.
Is that documented somewhere? Please add a reference, or elaborate how to reproduce this. I am also curious, because a lot of people are using this, I think, and I have not heard about the problem yet.

https://review.coreboot.org/c/coreboot/+/57296/comment/563d7e9d_0ed806fa 
PS3, Line 10: This issue is caused by adding FvNameGuid
            : in UefiPayloadEntry.fdf in EDKII. There is an ext header between header
            : of Fv and header of PayloadEntry in Fv with FvNameGuid. The ext header
            : causes the UefiPayloadEntry to be found incorrectly when parsing Fv.
Is that a recent change in UefiPayload?