Linux BSP & Board Bring-up

Trace EFI option ordering, option maintenance and media default-file resolution separately instead of treating every recovery path as unconditional fallback.

Trace control and working FDT identities independently, including packaging, driver inclusion and early-stage constraints.

Diagnose Yocto layer compatibility at four explicit boundaries: release declarations, layer dependencies, metadata interfaces, and layer-check signature evidence.

Follow BitBake signature divergence to the first changed input and verify that a rebuild optimization preserves real dependencies.

Choose recipe retention from the evidence needed: cleanup ordering, PN exclusion, surviving task logs, removed intermediates and separate package metadata.

Compare merge and deletion semantics with selected variable names before importing a configuration snapshot.

Gate optional appends with BBFILES_DYNAMIC collection identities, trace expansion into BBFILES and diagnose unconditional discovery leaks or version-specific append mismatches.

Trace shallow mirror generation and filename identity, current-clone preference and full-download fallback before treating BB_GIT_SHALLOW as a transfer-size guarantee.

Budget the simple allocator by cumulative allocations and alignment rather than simultaneously live payload.

Audit the sysreset fallback search before assuming a warm request preserves the intended reset domains.