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Use when bringing up bare-metal or kernel code on a new architecture, SoC, or board (RISC-V, ARM, x86, ESP32) and it won't boot, hangs after boot, or faults early; covers trap vectors, MMU/PMP, syscall ABI, and boot ordering
Codex または Claude でインストール この Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。
SOC 職業分類に基づく
Use when implementing a hardware block, protocol, peripheral, or ISA feature in ROHD and you should ground it in the authoritative spec, existing reference implementations, and reusable libraries you fetch first, instead of writing it from memory
Use when building or debugging a compiler backend, codegen, or assembler and you need to prove the generated machine code is correct by executing it on a real CPU or a fast emulator, not just inspecting the output
Use when verifying a hardware DUT (a CPU core, FPGA, or netlist) against a golden reference model, building coverage-guided fuzzing, or detecting where silicon diverges from a simulator like Spike, an emulator, or SPICE
Use when building or debugging a firmware and boot chain (RISC-V SBI, UEFI, ACPI, a bootloader handoff like Limine to an OS) or adding measured boot with a TPM, and a stage fails to hand off to the next
Use when loading a bitstream onto a physical FPGA and driving or observing it over JTAG or GPIO, especially bit-banged JTAG from a host like a Raspberry Pi, or when configuration silently fails
Use when synthesizing RTL to an FPGA with yosys/nextpnr (ECP5/Lattice and similar), fighting area or routing congestion, measuring Fmax, deciding why a design won't fit or route, or instantiating block RAM; covers the pre-pack vs post-pack metric trap
| name | bare-metal-bringup |
| description | Use when bringing up bare-metal or kernel code on a new architecture, SoC, or board (RISC-V, ARM, x86, ESP32) and it won't boot, hangs after boot, or faults early; covers trap vectors, MMU/PMP, syscall ABI, and boot ordering |
Bringing up code on new silicon or a new architecture is a sequence of "does the most basic thing work yet" checkpoints. Each layer has a small number of mistakes that produce total silence or a single cryptic fault, and they are almost always init ordering, trap setup, address translation, or ABI mismatches.
Core principle: Get one character out the door first, then build up one checkpoint at a time. Until you have output, you are debugging blind, so the first job is always a working console, not the feature you wanted.
Climb in order. Don't debug a higher rung until the one below it is solid.
See bringup-gotchas.md in this skill directory for the concrete, hard-won failures at each rung.
u64 max, or they fall through to a null deref.A bug that only appears under KVM (and not plain TCG) is usually a real hardware-ordering or state-save bug that TCG's looser model hides: FP/SIMD state not saved on the trap path, per-CPU pointer not set before the first IRQ, a sleeper list reusing a runqueue link. Treat "works in TCG, dies in KVM" as a genuine bug in your save/restore or ordering, not an emulator quirk.
silicon-grade-discipline.