@Kinney, Michael D and @gaoliming

We want to add TraceHubDebug library support on Edk2. It’s new added library on Edk2, so it doesn’t have any backward and forward issue.

May I know have any process we may need to follow up. Have any comment or concern please also share for me.

Reviewers/Maintainers: @Prakashan, Krishnadas Veliyathuparambil, @Chan, Laura, @K N, Karthik.

USF UPL spec update: https://github.com/UniversalScalableFirmware/documentation/pull/52 (Done)

Edk2 Bugzilla: https://bugzilla.tianocore.org/show_bug.cgi?id=4144 (On-Going)

Edk2 PR: https://github.com/tianocore/edk2/pull/3613 (On-Going)

Background:

• Problem: In the UPL (Universal Payload) binary which contains only the Edk2 drivers, Tracehub debug message are missing during the execution of early DXE Core modules (before ReportStatusCode is ready).
• Solution: Add TraceHub lib on Edk2, to be consumed by the UPL.

About TraceHubDebugLibSysT:

• Library is consumed by the DebugLib and StatusCodeHandler to send the PostCodes, ProgressCodes and DEBUG messages to the TraceHub/NPK in MIPI SyS-T format.
• The MIPI SyS-T APIs in this library are taken from the OpenSource implementation: https://github.com/MIPI-Alliance/public-mipi-sys-t.
• Library changes done for upstreaming:  MipiSystLib is rewritten to comply EDK2 coding standards and changed ways to pass trace address/verbosity with HOB directly instead of calling into TraceHubHookLib to get these info.
• Proposal With UPL: consume HOB gUniversalPayloadTraceHubDebugInfoGuid to print TraceHub Debug message in DXE Core

Thanks,

Gua