computer science

LibreCMC

LibreCMC is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand LibreCMC rather than just read about it. In short: LibreCMC is a GNU/Linux-libre distribution for computers with minimal resources, such as the Ben NanoNote, ath9k-based Wi-Fi routers, and other hardware with emphasis on free software. Based on OpenWrt, the project's goal is to aim for compliance with the GNU Free System Distribution Guidelines (GNU FSDG) and ensure that the project continues to meet these requirements set forth by the Free Software Foundation (FSF).

Key takeaways

LibreCMC belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect LibreCMC to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of LibreCMC from memory before moving on to harder problems.

Reference excerpt

LibreCMC is a GNU/Linux-libre distribution for computers with minimal resources, such as the Ben NanoNote, ath9k-based Wi-Fi routers, and other hardware with emphasis on free software. Based on OpenWrt, the project's goal is to aim for compliance with the GNU Free System Distribution Guidelines (GNU FSDG) and ensure that the project continues to meet these requirements set forth by the Free Software Foundation (FSF). LibreCMC does not support ac (Wi-Fi 5) or ax (Wi-Fi 6) due to a lack of free chipsets. As of 2020, releases do not utilize codenames anymore. The acronym "CMC" in the libreCMC name stands for "Concurrent Machine Cluster".

History On April 23, 2014, libreCMC's first public release is mentioned in a Trisquel forum. On September 4, 2014, the Free Software Foundation (FSF) added libreCMC to its list of endorsed distributions. Shortly afterwards, on September 12, 2014, the FSF awarded their Respects Your Freedom (RYF) Certification to a new router pre-installed with libreCMC. On May 2, 2015, libreCMC merged with the LibreWRT project. LibreWRT, initially developed as a case study, was listed by the website prism-break.org as one of the alternatives to proprietary firmware, but today the website lists libreCMC. On March 10, 2016, the FSF awarded their RYF certification to a new router pre-installed with libreCMC. On March 29, 2017, libreCMC began its first release based upon the LEDE (Linux Embedded Development Environment) 17.01 codebase. On January 3, 2020, libreCMC began its first release based upon the OpenWrt 19.07 codebase.

Release history Source

List of supported hardware LibreCMC supports the following devices: Buffalo (Melco subsidiary)

WZR-HP-G300NH WHR-HP-G300NH Netgear

WNDR3800: v1.x TP-Link

TL-MR3020: v1 TL-WR741ND: v1 - v2, v4.20 - v4.27 TL-WR841ND: v5.x, v8.x, v9.x, v10.x, v11.x, v12.x TL-WR842ND: v1, v2 TL-WR1043ND: v1.x, v2.x, v3.x, v4.x, v5.x ThinkPenguin

TPE-NWIFIROUTER2 TPE-R1100 TPE-R1200 TPE-R1300 TPE-R1400 Qi-Hardware

Ben Nanonote

Illustrations

Worked examples

Example 1 — a first encounter with LibreCMC

Start with the simplest possible case. Write down what LibreCMC claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to LibreCMC before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about LibreCMC ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of LibreCMC

In research: LibreCMC appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses LibreCMC in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: LibreCMC is common in secondary-school and first-year university syllabi. It links to neighbouring topics Build automation, Custom firmware, Embedded Linux, so understanding it makes those chapters shorter.
In everyday life: Look for LibreCMC outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study LibreCMC in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what LibreCMC means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain LibreCMC out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is LibreCMC in simple terms?

Why does LibreCMC matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study LibreCMC?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on LibreCMC.