processmission/oh-my-qemu/qemu-uboot-build

QEMU U-Boot Build

Audit workflow

For a non-trivial task that writes to the workspace, use only the needed entries under .oh-my-qemu/<task-slug>/: audit.md (baseline, plan, decisions, evidence, verification, and gaps), commands.md (redacted commands, working directories, and results), logs/ (decisive build, test, and runtime output), scripts/ (probes, parsers, and harnesses), and output/ (generated deliverables, third-party dependencies, and non-QEMU binaries). Keep QEMU's own build tree at source-root builds/build-<target>/, never an unqualified build/. In a Git worktree, add .agents/, .oh-my-qemu/, and builds/ to the file from git rev-parse --git-path info/exclude before writing artifacts or configuring QEMU; preserve existing entries and avoid duplicates. Never stage or commit these paths; stage source only when the user explicitly requests that separate action. At handoff, reconcile git status --short with the baseline and report the task directory, build directory, source changes, pre-existing changes, and unresolved gaps.

QEMU upstream boundary

QEMU's official GitLab and mailing lists are upstream channels. A patch becomes an upstream contribution when it is sent to the maintainers selected through MAINTAINERS. Do not prepare or send agent-generated code, documentation, commit messages, or patches for upstream submission; see the checked-out tree's docs/devel/code-provenance.rst. Research, debugging, analysis, local experiments, verification, and workflow guidance remain allowed. Local branches, commits, patch files, pushes, and pull requests are not by themselves upstream contributions; perform those Git actions only when requested.

Scope

Build U-Boot and its loader stages for QEMU firmware boot tests. QEMU itself belongs to qemu-build and the Linux kernel to qemu-kernel-build. Keep U-Boot outputs and dependency packages under the task output/ directory.

Build flow

Record U-Boot source revision and dirty state; board defconfig and config fragments; cross compiler prefix, absolute path, and version; output directory; external dependencies such as BL31/TF-A, TEE or OP-TEE, DDR init, device trees, or vendor firmware blobs; and a hash of every artifact consumed by QEMU or packaged into an image. Adapt the tree's documentation:

make O=<abs-output>/uboot <board_defconfig>
make O=<abs-output>/uboot CROSS_COMPILE=<prefix> -j<nproc>

Use an absolute O= path. When the firmware chain needs environment variables such as BL31, record their resolved paths and hashes before building. Some vendor U-Boot trees must be built in-tree or with vendor-specific variables; inspect the tree's documentation and record any deviation from the generic shape.

Artifact inspection

Inspect every artifact before use; a filename does not describe its contents.

• Use file, dumpimage -l, and mkimage metadata to identify SPL, U-Boot proper, FIT/ITB,

and combined images; record sizes, load addresses, and component names.

• Treat each boot stage as a separate provenance item and hash it separately.
• A combined image may contain a different stage than expected: record the packaging command and

verify the embedded bytes. FIT signing needs keys and a policy; do not call an image signed when signing was not configured.

• Copy assets/artifact-manifest-template.md and fill one row per stage before packaging.

Firmware chain packaging

When packaging U-Boot into a vendor firmware image (FIP, BIOS, or a flash image):

• record the input U-Boot artifact hash and the documented destination offset;
• package an isolated copy and compare the embedded bytes against the source artifact at that

offset, not only the container hash;

• record whether TF-A/BL31 was built from source or supplied as a blob, with revision and hash;
• keep the source media read-only and write the test image to a task-local path.

Common failures

Upstream references

• docs/system/linuxboot.rst
• docs/system/invocation.rst
• docs/devel/testing/main.rst
• docs/devel/code-provenance.rst

Paths can differ between QEMU versions; locate them in the checked-out tree.