Zephyr Development

Read the shared embedded contract and keep source/build, device and physical evidence separate.

Record the exact Zephyr revision, frozen west manifest, SDK/toolchain, host, board qualifier, application, overlays and build directory. A PlatformIO Zephyr package and a west workspace can contain different Zephyr releases.

Read workspace and diagnosis. Reproduce with the existing build manager first. In a west workspace use west manifest --freeze and inspect west list; neither a board family nor an old board alias is a verified target. west build -b BOARD APP -d BUILD --pristine=auto configures and compiles; a pristine build removes generated build state, so use a disposable build directory. Retain zephyr.dts, .config, ELF/map and the first failing compiler/linker command. Inspect final generated settings, not only overlays.