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This accurately reflects what's really happening. Vboot 2.0 is backwards-compatible with the binary structs used in vboot 1.0, while vboot 2.1 will not be. When building firmware, vboot_reference should be invoked in one of three ways: TARGET OUTPUT VERSION fwlib vboot_fw.a 1.0 fwlib20 vboot_fw20.a 2.0 fwlib21 vboot_fw21.a 2.1 BUG=chromium:228932 BRANCH=ToT CQ-DEPEND=CL:243981 TEST=manual emerge-veyron_pinky coreboot emerge-samus coreboot emerge-daisy_spring chromeos-u-boot make runtests Change-Id: I98d8ea6b48e5922a470e744d56699cad43eabb3d Signed-off-by: Bill Richardson <wfrichar@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/243980 Reviewed-by: Randall Spangler <rspangler@chromium.org>
Here's what's what in the firmware/ directory. include/ lib/ These are the original structures and APIs used in the earliest Chromebooks and continuing through 2014. It never had a version as such to begin with, but we now refer to this implementation as "vboot1" or "vboot version 1.0". linktest/ stub/ These are stubs used to link the vboot1 libraries into host-side test executables so we can run some tests on the build machine instead of a Chromebook. 2lib/ In 2014 we began work on a new vboot API. The first step was just a refactoring and renaming of the verification API. The public functions and external headers that are exported for use by the Chrome OS firmware (or anything else that wants to use vboot) live in here. The internal structures and implementations go elsewhere. lib20/ This is an early implementation of the public (2lib/) API. It is binary-compatible with vboot1, so although the interface details are different, any existing on-device structures or signatures created by the vboot1 tools can be validated using this implementation. This was deployed slightly before it was ready. That's not a problem, thanks to the binary compatibility, but this directory will be abandoned Real Soon Now, except for the product support branches. lib21/ This is where the current development of the second-generation vboot API is taking place. It uses the public (2lib/) API, but will NOT be binary compatible with vboot1 structs. Because of the early release of the lib20 stuff, we're actually calling this lib21.