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The LinuxBoot Book

LinuxBoot is a project that aims to replace specific firmware functionality with a Linux kernel and runtime. Over the years this project has grown to include various initiatives with the overarching goal of moving from obscure, complex firmware to simpler, open source firmware.

This is the official site of documentation for the LinuxBoot project. The book provides guidance on how to get started, and gives overviews and background on the different aspects of LinuxBoot.

Table of Contents

Chapter Title
1 Overview and Table of Contents
2 LinuxBoot Introduction
3 LinuxBoot Components
4 All about u-root
5 The magical cpu command
6 Implementing LinuxBoot
7 Glossary
8 Case Studies

Acknowledgments

In alphabetical order:

About

LinuxBoot book which contains the documentation in markdown format

Resources

Readme
CC-BY-SA-4.0 license
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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The LinuxBoot Book
LinuxBoot is a project that aims to replace specific firmware functionality with
a Linux kernel and runtime. Over the years this project has grown to include
various initiatives with the overarching goal of moving from obscure, complex
firmware to simpler, open source firmware.
This is the official site of documentation for the LinuxBoot project. The book
provides guidance on how to get started, and gives overviews and
background on the different aspects of LinuxBoot.
Table of Contents
Chapter Title
1 Overview and Table of Contents
2 LinuxBoot Introduction
3 LinuxBoot Components
4 All about u-root
5 The magical cpu command
6 Implementing LinuxBoot
7 Glossary
8 Case Studies
Acknowledgments
In alphabetical order:
About
LinuxBoot book which contains the documentation in markdown format
Resources
Readme
CC-BY-SA-4.0 license
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
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Contributors

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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BranchesTags
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The LinuxBoot Book
LinuxBoot is a project that aims to replace specific firmware functionality with
a Linux kernel and runtime. Over the years this project has grown to include
various initiatives with the overarching goal of moving from obscure, complex
firmware to simpler, open source firmware.
This is the official site of documentation for the LinuxBoot project. The book
provides guidance on how to get started, and gives overviews and
background on the different aspects of LinuxBoot.
Table of Contents
Chapter Title
1 Overview and Table of Contents
2 LinuxBoot Introduction
3 LinuxBoot Components
4 All about u-root
5 The magical cpu command
6 Implementing LinuxBoot
7 Glossary
8 Case Studies
Acknowledgments
In alphabetical order:
About
LinuxBoot book which contains the documentation in markdown format
Resources
Readme
CC-BY-SA-4.0 license
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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The LinuxBoot Book
LinuxBoot is a project that aims to replace specific firmware functionality with
a Linux kernel and runtime. Over the years this project has grown to include
various initiatives with the overarching goal of moving from obscure, complex
firmware to simpler, open source firmware.
This is the official site of documentation for the LinuxBoot project. The book
provides guidance on how to get started, and gives overviews and
background on the different aspects of LinuxBoot.
Table of Contents
Chapter Title
1 Overview and Table of Contents
2 LinuxBoot Introduction
3 LinuxBoot Components
4 All about u-root
5 The magical cpu command
6 Implementing LinuxBoot
7 Glossary
8 Case Studies
Acknowledgments
In alphabetical order:
About
LinuxBoot book which contains the documentation in markdown format
Resources
Readme
CC-BY-SA-4.0 license
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
Repository files navigation
The LinuxBoot Book
LinuxBoot is a project that aims to replace specific firmware functionality with
a Linux kernel and runtime. Over the years this project has grown to include
various initiatives with the overarching goal of moving from obscure, complex
firmware to simpler, open source firmware.
This is the official site of documentation for the LinuxBoot project. The book
provides guidance on how to get started, and gives overviews and
background on the different aspects of LinuxBoot.
Table of Contents
Chapter Title
1 Overview and Table of Contents
2 LinuxBoot Introduction
3 LinuxBoot Components
4 All about u-root
5 The magical cpu command
6 Implementing LinuxBoot
7 Glossary
8 Case Studies
Acknowledgments
In alphabetical order:
About
LinuxBoot book which contains the documentation in markdown format
Resources
Readme
CC-BY-SA-4.0 license
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
The LinuxBoot Book
LinuxBoot is a project that aims to replace specific firmware functionality with
a Linux kernel and runtime. Over the years this project has grown to include
various initiatives with the overarching goal of moving from obscure, complex
firmware to simpler, open source firmware.
This is the official site of documentation for the LinuxBoot project. The book
provides guidance on how to get started, and gives overviews and
background on the different aspects of LinuxBoot.
Table of Contents
Chapter Title
1 Overview and Table of Contents
2 LinuxBoot Introduction
3 LinuxBoot Components
4 All about u-root
5 The magical cpu command
6 Implementing LinuxBoot
7 Glossary
8 Case Studies
Acknowledgments
In alphabetical order:
About
LinuxBoot book which contains the documentation in markdown format
Resources
Readme
CC-BY-SA-4.0 license
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
The LinuxBoot Book
LinuxBoot is a project that aims to replace specific firmware functionality with
a Linux kernel and runtime. Over the years this project has grown to include
various initiatives with the overarching goal of moving from obscure, complex
firmware to simpler, open source firmware.
This is the official site of documentation for the LinuxBoot project. The book
provides guidance on how to get started, and gives overviews and
background on the different aspects of LinuxBoot.
Table of Contents
Chapter Title
1 Overview and Table of Contents
2 LinuxBoot Introduction
3 LinuxBoot Components
4 All about u-root
5 The magical cpu command
6 Implementing LinuxBoot
7 Glossary
8 Case Studies
Acknowledgments
In alphabetical order:
About
LinuxBoot book which contains the documentation in markdown format
Resources
Readme
CC-BY-SA-4.0 license
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
BranchesTags
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The LinuxBoot Book
LinuxBoot is a project that aims to replace specific firmware functionality with
a Linux kernel and runtime. Over the years this project has grown to include
various initiatives with the overarching goal of moving from obscure, complex
firmware to simpler, open source firmware.
This is the official site of documentation for the LinuxBoot project. The book
provides guidance on how to get started, and gives overviews and
background on the different aspects of LinuxBoot.
Table of Contents
Chapter Title
1 Overview and Table of Contents
2 LinuxBoot Introduction
3 LinuxBoot Components
4 All about u-root
5 The magical cpu command
6 Implementing LinuxBoot
7 Glossary
8 Case Studies
Acknowledgments
In alphabetical order:
About
LinuxBoot book which contains the documentation in markdown format
Resources
Readme
CC-BY-SA-4.0 license
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors