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Agent skill

Qemu Embedded Simulation

by mohitmishra786 in mohitmishra786/low-level-dev-skills

QEMU embedded simulation skill for bare-metal MCU testing. An agent skill from mohitmishra786/low-level-dev-skills.

MITAuto-check passedDevelopment

Install Qemu Embedded Simulation

skills CLI
$ npx skills add mohitmishra786/low-level-dev-skills --skill qemu-embedded-simulation -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install mohitmishra786/low-level-dev-skills qemu-embedded-simulation --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/mohitmishra786/low-level-dev-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/qemu/qemu-embedded-simulation .claude/skills/qemu-embedded-simulation && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
qemu-embedded-simulation
GitHub stars
253
Token cost
~1k tokens
SKILL.md length
321 words
Files
1
Skills in repo
138
Repo updated
First seen
Licence
MIT

At a glance

QEMU embedded simulation skill for bare-metal MCU testing. An agent skill from mohitmishra786/low-level-dev-skills.

  • Works in 7 steps: ARM Cortex-M (QEMU STM32 boards) → Generic ARM virt (Cortex-A test) → RISC-V bare metal → …
  • Running ARM/RISC-V firmware in QEMU
  • SKILL.md covers Purpose, When to Use, Workflow and Common Problems, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Qemu Embedded Simulation is an agent skill from mohitmishra786/low-level-dev-skills. QEMU embedded simulation skill for bare-metal MCU testing. Use when running ARM/RISC-V firmware in QEMU, selecting machine models, loading -kernel ELF, or GDB debugging without hardware. Activates on queries about QEMU bare metal, qemu-system-arm -kernel, STM32 QEMU machine, RISC-V virt, or firmware simulation.

Its SKILL.md is about 1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development. The repository describes itself as: A curated suite of AI agent skills for systems and low-level programming with C/C++, Rust, and Zig toolchains, covering compilers, debuggers, profilers, build systems…. The licence is MIT.

When your agent uses it

  • Running ARM/RISC-V firmware in QEMU
  • Selecting machine models
  • Loading -kernel ELF
  • GDB debugging without hardware

Example prompts

  • “/qemu-embedded-simulation”

Workflow steps

7 steps, taken from the step headings in SKILL.md.

  1. ARM Cortex-M (QEMU STM32 boards)
  2. Generic ARM virt (Cortex-A test)
  3. RISC-V bare metal
  4. GDB stub
  5. Semihosting (if supported)
  6. Limitations (QEMU STM32 per upstream docs)
  7. Agent usage

What it can do on your machine

Read from SKILL.md and the folder at commit bdc5847. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are bash).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Links to these hosts (documentation or services it may open):

    • qemu.org

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Qemu Embedded Simulation loads about 1k tokens when it runs. Until then it costs about 84 tokens; SKILL.md has 321 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~84
When it runs · the whole SKILL.md, loaded when a task matches
~1k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from mohitmishra786/low-level-dev-skills at commit bdc5847, republished under its MIT licence (© mohitmishra786). 321 words, ~1,004 tokens.

Download SKILL.mdSave it as .claude/skills/qemu-embedded-simulation/SKILL.md (or your agent's skills folder).
name
qemu-embedded-simulation
description
QEMU embedded simulation skill for bare-metal MCU testing. Use when running ARM/RISC-V firmware in QEMU, selecting machine models, loading -kernel ELF, or GDB debugging without hardware. Activates on queries about QEMU bare metal, qemu-system-arm -kernel, STM32 QEMU machine, RISC-V virt, or firmware simulation.

QEMU Embedded Simulation

Purpose

Guide agents through QEMU for bare-metal and RTOS firmware: machine selection, loading ELF images, semihosting, peripheral models, and GDB debug — distinct from Linux-focused skills/virtualization/qemu-kvm and skills/kernel-dev/qemu-for-kernel-development.

When to Use

  • Test Cortex-M firmware without board
  • CI smoke test for linker script / startup
  • GDB single-step before OpenOCD on hardware
  • RISC-V bring-up on virt machine

Workflow

1. ARM Cortex-M (QEMU STM32 boards)

QEMU models a subset of STM32 boards (see qemu.org STM32 docs):

MachineMCUCore
stm32vldiscoverySTM32F100RBT6Cortex-M3
netduino2STM32F205RFT6Cortex-M3
netduinoplus2STM32F405RGT6Cortex-M4F
olimex-stm32-h405STM32F405RGT6Cortex-M4F
bash
# stm32vldiscovery — Cortex-M3 (not F4); match -mcpu to the board
arm-none-eabi-gcc -mcpu=cortex-m3 -T linker.ld -o firmware.elf main.c startup.s
qemu-system-arm \
  -machine stm32vldiscovery \
  -kernel firmware.elf \
  -nographic \
  -serial mon:stdio

Boot with -kernel firmware.bin or .elf per QEMU STM32 boot options.

Machine list: qemu-system-arm -machine help. GPIO, DMA, and I2C are not modeled on current QEMU STM32 machines — USART/SPI/ADC/timer are partially supported.

2. Generic ARM virt (Cortex-A test)
bash
qemu-system-aarch64 -machine virt -cpu cortex-a53 -m 128M \
  -kernel firmware.elf -nographic
3. RISC-V bare metal
bash
qemu-system-riscv32 -machine virt -nographic \
  -bios none \
  -kernel firmware.elf

-bios none starts at reset vector without OpenSBI.

4. GDB stub
bash
qemu-system-arm -machine stm32vldiscovery -kernel firmware.elf \
  -S -gdb tcp::3333 -nographic

arm-none-eabi-gdb firmware.elf
(gdb) target remote :3333
(gdb) monitor reset halt
(gdb) load

Pair with skills/embedded/openocd-jtag for on-target workflow.

5. Semihosting (if supported)
bash
qemu-system-arm ... -semihosting-config enable=on,target=native

Allows printf via semihosting syscall — toolchain must be built with semihosting support.

6. Limitations (QEMU STM32 per upstream docs)
GotchaReality
No GPIO in QEMU STM32GPIO controller not implemented — LED blink tests need hardware or another machine
No DMA / I2CDMA and I2C missing on STM32 QEMU models
Partial RCCRCC reset/enable only on F4; not full clock tree
Wrong MCU assumedstm32vldiscovery is F100 M3, not F407 — match CPU flags and linker memory
TimingNot cycle-accurate vs silicon

Validate on hardware before production sign-off.

7. Agent usage
/qemu-embedded-simulation Run STM32VL discovery firmware in QEMU with GDB on port 3333

Common Problems

SymptomCauseFix
QEMU exits immediatelymain returnedLoop or WFI at end
Wrong entry addressELF not linked for modelCheck readelf -h entry
No serial outputWrong UART model addressUse machine-specific map or semihosting
GDB can't connectForgot -SAdd -S -gdb tcp::3333
HardFault in QEMUStack/vector invalidFix startup — see baremetal-startup
  • skills/baremetal/baremetal-startup — vectors and linker script
  • skills/baremetal/stm32-baremetal — STM32 layout
  • skills/embedded/openocd-jtag — hardware debug
  • skills/kernel-dev/qemu-for-kernel-development — Linux kernel in QEMU
  • skills/platform/riscv-privileged — RISC-V reset and virt

© mohitmishra786, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/qemu/qemu-embedded-simulation of mohitmishra786/low-level-dev-skills.

Open the folder on GitHubat commit bdc5847

Compare with similar skills

Qemu Embedded Simulation next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Qemu Embedded Simulation compared with similar skills
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Qemu Embedded Simulation this skillmohitmishra786/low-level-dev-skills253—~1kAutomated safety check: PassMIT
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Typescript Advanced Typesrolling-scopes/rsschool-app10k25 repos~4.2kAutomated safety check: PassMPL-2.0
PR Babysitteropeninterpreter/openinterpreter69k3 repos~4.2kAutomated safety check: PassApache-2.0
Code Review ChecklistshareAI-lab/learn-claude-code78k5 repos~1.1kAutomated safety check: PassMIT

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Categories

Questions about Qemu Embedded Simulation

What does Qemu Embedded Simulation do?

QEMU embedded simulation skill for bare-metal MCU testing. An agent skill from mohitmishra786/low-level-dev-skills. Qemu Embedded Simulation is an agent skill from mohitmishra786/low-level-dev-skills. QEMU embedded simulation skill for bare-metal MCU testing.

When should I use Qemu Embedded Simulation?

Qemu Embedded Simulation fits situations like: running ARM/RISC-V firmware in QEMU; selecting machine models; loading -kernel ELF; GDB debugging without hardware.

How do I install Qemu Embedded Simulation in Claude Code?

Run `npx skills add mohitmishra786/low-level-dev-skills --skill qemu-embedded-simulation -a claude-code`. Or copy the skill folder (skills/qemu/qemu-embedded-simulation in mohitmishra786/low-level-dev-skills) into .claude/skills/qemu-embedded-simulation in your project. Claude Code loads it when a task matches its description.

How do I install Qemu Embedded Simulation in Codex?

Run `npx skills add mohitmishra786/low-level-dev-skills --skill qemu-embedded-simulation -a codex`. Or copy the skill folder (skills/qemu/qemu-embedded-simulation in mohitmishra786/low-level-dev-skills) into .agents/skills/qemu-embedded-simulation in your project. Codex loads it when a task matches its description.

Can I use Qemu Embedded Simulation in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mohitmishra786/low-level-dev-skills --skill qemu-embedded-simulation -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/qemu-embedded-simulation, .gemini/skills/qemu-embedded-simulation, .github/skills/qemu-embedded-simulation and .opencode/skills/qemu-embedded-simulation in your project.

What does Qemu Embedded Simulation need to run?

SKILL.md names no scripts, command-line tools or credentials: Qemu Embedded Simulation is instructions for the agent only.

Does Qemu Embedded Simulation access the network?

SKILL.md names 1 domain. As links in the text: qemu.org. This is read from the text; nothing was executed.

Is Qemu Embedded Simulation safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Qemu Embedded Simulation use?

Qemu Embedded Simulation is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Qemu Embedded Simulation use?

About 1k tokens (SKILL.md is roughly 4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Qemu Embedded Simulation?

Skills that share tags, products or a category with Qemu Embedded Simulation: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 297k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Qemu Embedded Simulation?

mohitmishra786 (a GitHub user) maintains it in mohitmishra786/low-level-dev-skills, which has 253 GitHub stars. The repository holds 138 skills in this directory. The repository was last updated on June 27, 2026.

Source: mohitmishra786/low-level-dev-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.