I don't get the point of this patch. Please give me more documentation

Patch set 4:Code-Review -2

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Gerrit-Project: coreboot
Gerrit-Branch: master
Gerrit-Change-Id: I1fb376b4a8b98baffaee4d574937797bba1f8aee
Gerrit-Change-Number: 35077
Gerrit-PatchSet: 4
Gerrit-Owner: Bill XIE <persmule@hardenedlinux.org>
Gerrit-Reviewer: Aaron Durbin <adurbin@chromium.org>
Gerrit-Reviewer: Bill XIE <persmule@hardenedlinux.org>
Gerrit-Reviewer: Martin Roth <martinroth@google.com>
Gerrit-Reviewer: Patrick Georgi <pgeorgi@google.com>
Gerrit-Reviewer: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Gerrit-Reviewer: build bot (Jenkins) <no-reply@coreboot.org>
Gerrit-CC: Joel Kitching <kitching@google.com>
Gerrit-CC: Patrick Rudolph <siro@das-labor.org>
Gerrit-CC: Shawn C <citypw@hardenedlinux.org>
Gerrit-Comment-Date: Thu, 05 Sep 2019 17:28:58 +0000
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