mirror of
https://github.com/Telecominfraproject/OpenCellular.git
synced 2026-01-01 21:02:27 +00:00
a80a79f9f5
The calling firmware can set ctx->flags VB2_CONTEXT_NVDATA_V2 to tell vboot that nvdata is a 64-byte record instead of a 16-byte record, or equivalently, set the VBSD_NVDATA_V2 flag if calling the old vboot1 API. If calling firmware does not (which is the current coreboot and depthcharge default), then the 16-byte record is used, and V2 fields return explicit default values. Added the fw_max_rollforward V2 field, which defaults to 0xfffffffe on V1. This will be used by a subsequent CL. Added unit tests to verify all that. Added crossystem support, though it will only work with the current 16-byte records until firmware sets the VBSD flag and mosys supports larger records. (Note that because coreboot/depthcharge do not yet set the new context flag, this CL should not change ToT firmware behavior.) See go/vboot-nvstorage for design doc. BUG=chromium:789276 BRANCH=none TEST=make runtests Change-Id: I43072ef153dfa016c051f560892af1fbb3508e3a Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/942031
Here's what's what in the firmware/ directory. bdb/ Code for managing Boot Descriptor Blocks (BDB). 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.