BFE EngineeringandClaude Opus 4.8
4a1ec1d84e
The c8a3 brick was a memory-map fault no behavioural sim can catch: a boot-loaded coprocessor firmware dropped at 0x40000, which is a reserved-memory carve-out on Thunder-Boot boards but plain kernel RAM on ours. config-lint is the static gate for it — parse the rkbin loader .ini for every LOADERn=Hpmcu LOAD_ADDR, parse the target devicetree for reserved-memory ranges, fail if any MCU load lands outside a reservation. Tests encode the brick as a regression against the REAL Thunder-Boot .ini (Hpmcu@0x40000): fails with no rtos@40000 node, passes once reserved; our board's non-TB loader (no boot-loaded MCU) always passes. 6/6 green; CLI verified against the on-disk rkbin .ini files. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017wB8KB3MMQztRDXCMCkPrf
43 lines
1.7 KiB
Markdown
43 lines
1.7 KiB
Markdown
# config-lint — static target-config gates
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Catches flash-time config faults the behavioural sim cannot: mistakes in the
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*memory map*, not the logic. The first check is the one that would have caught the
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**c8a3 brick** — a boot-loaded coprocessor firmware dropped at `0x40000`, which is
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a `reserved-memory` carve-out on Thunder-Boot boards but plain kernel RAM on ours,
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so the MCU and the kernel fought over the same DRAM and the board hung before eth0.
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## The check
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Every address the idblock loader drops MCU firmware to must sit inside a
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`reserved-memory` node in the target devicetree.
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- **MCU loads** come from the rkbin loader `.ini`: each `LOADERn=Hpmcu` (any
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hpmcu/mcu/amp entry) in `[LOADER_OPTION]`, with its `LOAD_ADDR` from
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`[LOADERn_PARAM]`.
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- **Reserved ranges** come from the devicetree: every `reg = <addr size>` inside a
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`reserved-memory { … }` node.
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A load outside all reservations is a failure (non-zero exit).
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## Use
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cargo run -p warden-config-lint -- --ini <loader.ini> --dt <devicetree.dts>
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In CI, feed the *flattened* devicetree so includes and overlays are resolved:
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dtc -I dtb -O dts build/.../rv1106g-warden.dtb > /tmp/warden.dts
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config-lint --ini .../RKBOOT/RV1106MINIALL*.ini --dt /tmp/warden.dts
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Exit `0` = every MCU load is reserved (or there are none); `1` = a collision was
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found; `2` = usage/IO error.
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## Test
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cargo test -p warden-config-lint
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The suite encodes the brick as a regression: the real Thunder-Boot `.ini`
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(Hpmcu @ `0x40000`) *fails* against a DT with no `rtos@40000` node and *passes*
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once the reservation is added — and our board's non-TB loader (no boot-loaded MCU)
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always passes. See `../../docs/architecture.md` §5 and, for the hardware hazard,
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the `boot-loaded-mcu-0x40000-hazard` note.
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