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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="theme-color" content="#383838">
<title>GBB flag-inator</title>
<meta name="description" content="Select and decode GBB flags for ChromeOS">
<meta name="og:title" content="GBB flag-inator">
<meta name="og:description" content="Select and decode GBB flags for ChromeOS">
<meta name="og:type" content="website">
<meta name="og:url" content="https://binbashbanana.github.io/gbbflaginator/">
<link rel="canonical" href="https://binbashbanana.github.io/gbbflaginator/">
<base target="_blank">
<style>
body {
font-family: sans-serif;
background-color: #282828;
color: #f0f0f0;
position: absolute;
width: calc(100vw - 20px);
height: calc(100vh - 20px);
left: 0px;
top: 0px;
margin: 0px;
padding: 10px;
overflow: hidden;
display: flex;
gap: 10px;
}
a {
color: #3ec3f0;
}
p {
font-size: 12pt;
line-height: 26px;
}
.biggertext {
font-size: 14pt;
}
.codeinline {
font-family: monospace;
background-color: rgba(200, 200, 200, 0.1);
border-radius: 4px;
padding: 2px 6px;
}
code {
font-family: monospace;
background-color: rgba(200, 200, 200, 0.1);
border-radius: 6px;
padding: 8px 16px;
margin: 5px 10px 5px 0px;
display: block;
white-space: pre;
overflow-x: auto;
}
.title {
position: absolute;
left: 0px;
top: 0px;
height: 40px;
line-height: 40px;
margin: 20px 10px;
}
.column {
overflow-wrap: break-word;
min-width: 40vw;
max-width: 60vw;
}
.column:first-of-type {
padding-top: 80px;
}
.column:last-of-type {
overflow: auto;
}
.topleftbox {
overflow: hidden;
height: 100px;
}
.topleftbox h2 {
margin: 0px 0px 16px 0px;
}
body[data-fancybg="inator"] {
background-image: url(inator.webp);
background-attachment: fixed;
background-size: 100% 100%;
}
.flexoid {
display: none;
flex-direction: column;
height: calc(100vh - 200px);
gap: 10px;
overflow: hidden;
}
.flexling {
overflow: hidden auto;
background-color: rgba(0, 0, 0, 0.1);
}
.flexling>* {
margin: 10px 10px 20px 10px;
}
.flexling>* h2 {
margin: 0px 0px 16px 0px;
}
#modeselect label {
display: block;
margin: 6px;
width: max-content;
}
#modeselect input {
vertical-align: baseline;
margin-right: 6px;
}
#selectflagslist input {
transform: scale(1.5);
vertical-align: middle;
margin-right: 10px;
}
#inputerror {
color: #ff8080;
}
.bottomline {
margin-bottom: 0px;
}
@media only screen and (max-width: 720px) {
body {
flex-direction: column;
overflow: hidden auto;
}
.column {
max-width: none;
}
.column:last-of-type {
overflow: initial;
}
}
</style>
</head>
<body>
<h1 class="title">GBB flag-inator</h1>
<div class="column">
<div class="topleftbox">
<h2>Mode select</h2>
<div id="modeselect">
<label><input type="radio" name="modeselect" value="selectflags" checked>Select flags</label>
<label><input type="radio" name="modeselect" value="decode">Decode flags</label>
</div>
</div>
<div class="flexoid" id="selectflags">
<div>
<h2>Your GBB flags: <span id="flagsout" class="codeinline">0x0</span></h2>
</div>
<div class="flexling" id="selectflagslist"></div>
</div>
<div class="flexoid" id="decode">
<div>
<h2>Input your GBB flags:</h2>
<input type="text" id="flagsinput" spellcheck="false" placeholder="0x1234ABCD">
<p id="inputerror"></p>
</div>
<div class="flexling" id="decodelist"></div>
</div>
</div>
<div class="column">
<h2>What are GBB flags?</h2>
<p>
From <a href="https://mrchromebox.tech/#firmware">mrchromebox.tech</a>:<br>
The ChromeOS firmware boot flags / Google Binary Block (GBB) flags are firmware level settings
stored directly in the firmware flash chip itself in a read-only (RO) area, and therefore require
the firmware write protect to be disabled before setting. The GBB flags control the behavior of
the firmware payload used to boot ChromeOS (depthcharge); they are used to set the default boot
mode (ChromeOS or Legacy Boot Mode), the Developer Mode boot screen timeout (2s or 30s), prevent
exiting Developer Mode via spacebar, and to enable Legacy Boot Mode regardless of crossystem
dev_boot_altfw/dev_boot_legacy setting, among other things.<br>
<i>Important: The GBB Flags are only valid when using the the stock firmware, or stock + RW_LEGACY
firmware. They have no effect (and cannot be set) when using the UEFI Full ROM firmware.</i>
</p>
<br>
<h2>How do I set GBB flags?</h2>
<p>
You must first <a href="https://wiki.mrchromebox.tech/Firmware_Write_Protect">disable firmware write protection</a>.
<p>
<p>
<i>Note that the following commands must be run as root</i><br>
On modern versions of ChromeOS, you can use the <span class="codeinline">futility</span> tool to
set the GBB flags, for example:
<code>futility gbb -s --flash --flags=0x4a9</code>
On older versions, there is a script you can call to set the GBB flags:
<code>/usr/share/vboot/bin/set_gbb_flags.sh 0x4a9</code>
<br>
Conversely, you can read the current GBB flags with the following command:
<code>futility gbb -g --flash --flags</code>
Or for older versions:
<code>/usr/share/vboot/bin/get_gbb_flags.sh</code>
<br>
The current GBB flags are also shown on the recovery/developer boot screen, after
<span class="codeinline">gbb.flags</span> when you press TAB.
</p>
<br>
<h2>Where is a list of all GBB flags?</h2>
<p>
I will try to keep this site updated as frequently as possible, but you can find the official
list in the <a href="https://chromium.googlesource.com/chromiumos/platform/vboot_reference/+/HEAD/firmware/2lib/include/2gbb_flags.h">ChromiumOS source code</a>.
</p>
<br>
<h2>Links</h2>
<p class="biggertext">
<a href="https://github.com/BinBashBanana/gbbflaginator">GitHub</a>
</p>
<p class="bottomline">Website made by OlyB</p>
</div>
<script>
const flagsDesc = {
"DEV_SCREEN_SHORT_DELAY": "Reduce the dev screen delay to 2 sec from 30 sec. Beep is also removed.",
"LOAD_OPTION_ROMS": "[Unsupported] BIOS should load option ROMs from arbitrary PCI devices.",
"ENABLE_ALTERNATE_OS": "[Unsupported] Boot a non-ChromeOS kernel.",
"FORCE_DEV_SWITCH_ON": "Force dev switch on, regardless of physical/keyboard dev switch. Be careful; this does not bypass FWMP.",
"FORCE_DEV_BOOT_USB": "Allow booting from external disk even if dev_boot_usb=0.",
"DISABLE_FW_ROLLBACK_CHECK": "Disable firmware rollback protection.",
"ENTER_TRIGGERS_TONORM": "Allow Enter key to trigger dev->tonorm screen transition.",
"FORCE_DEV_BOOT_ALTFW": "Allow booting altfw OSes even if dev_boot_altfw=0.",
"RUNNING_FAFT": "[Unsupported] Currently running FAFT tests. May enable workarounds in firmware, should not be set by the user.",
"DISABLE_EC_SOFTWARE_SYNC": "Disable EC software sync.",
"DEFAULT_DEV_BOOT_ALTFW": "Default to booting altfw OS when dev screen times out.",
"DISABLE_AUXFW_SOFTWARE_SYNC": "Disable auxiliary firmware (auxfw) software sync.",
"DISABLE_LID_SHUTDOWN": "Disable shutdown on lid closed.",
"DEPRECATED_FORCE_DEV_BOOT_FASTBOOT_FULL_CAP": "[Unsupported] Allow full fastboot capability in firmware even if dev_boot_fastboot_full_cap=0.",
"FORCE_MANUAL_RECOVERY": "Recovery mode always assumes manual recovery, even if EC_IN_RW=1.",
"DISABLE_FWMP": "Ignore FWMP.",
"ENABLE_UDC": "Enable USB Device Controller."
};
const flags = Object.keys(flagsDesc);
const mask = (2 ** flags.length) - 1;
let flagsSync = 0;
const modeselect = document.getElementById("modeselect");
const modes = {
"selectflags": document.getElementById("selectflags"),
"decode": document.getElementById("decode")
}
const modesArr = Object.keys(modes);
const flagsout = document.getElementById("flagsout");
const selectflagslist = document.getElementById("selectflagslist");
const flagsinput = document.getElementById("flagsinput");
const inputerror = document.getElementById("inputerror")
const decodelist = document.getElementById("decodelist");
function updateMode() {
var mode = modeselect.querySelector(":checked").value;
for (var i = 0; i < modesArr.length; i++) {
modes[modesArr[i]].style.display = (modesArr[i] == mode) ? "flex" : "none";
}
}
modeselect.addEventListener("change", updateMode, false);
window.addEventListener("load", function() {
window.setTimeout(updateMode, 0);
}, false);
function getFlagNode(flag, createCheckbox) {
var flagContainer = document.createElement("div");
var flagLabel = document.createElement("label");
var flagName = document.createElement("h2");
if (createCheckbox) {
var checkbox = document.createElement("input");
checkbox.type = "checkbox";
checkbox.value = flag;
flagName.appendChild(checkbox);
}
var flagSplit = flag.split("_");
for (var i = 0; i < flagSplit.length - 1; i++) {
flagName.appendChild(document.createTextNode(flagSplit[i] + "_"));
flagName.appendChild(document.createElement("wbr"));
}
flagName.appendChild(document.createTextNode(flagSplit.slice(-1)[0]));
flagLabel.appendChild(flagName);
flagContainer.appendChild(flagLabel);
flagContainer.appendChild(document.createTextNode(flagsDesc[flag]));
return flagContainer;
}
function updateBackground(e) {
if (e.ctrlKey && e.code == "KeyI") {
e.preventDefault();
if (document.body.dataset.fancybg) {
document.body.dataset.fancybg = "";
} else {
document.body.dataset.fancybg = "inator";
}
}
}
document.addEventListener("keydown", updateBackground, false);
for (var i = 0; i < flags.length; i++) {
selectflagslist.appendChild(getFlagNode(flags[i], true));
}
function resetSelectFlags() {
var boxes = Array.from(selectflagslist.querySelectorAll("input"));
for (var i = 0; i < boxes.length; i++) {
boxes[i].checked = false;
}
flagsout.textContent = "0x0";
}
function updateFlagsOut() {
var outFlags = 0;
var checks = Array.from(selectflagslist.querySelectorAll(":checked"));
for (var i = 0; i < checks.length; i++) {
var index = flags.indexOf(checks[i].value);
if (index < 0) continue;
outFlags |= 1 << index;
}
var outFlagsText = "0x" + outFlags.toString(16);
flagsout.textContent = outFlagsText;
flagsinput.value = outFlags ? outFlagsText : "";
updateDecodeList(null);
}
selectflagslist.addEventListener("change", updateFlagsOut, false);
function updateDecodeList(e) {
decodelist.innerHTML = "";
if (!flagsinput.value.startsWith("0x")) {
inputerror.textContent = flagsinput.value ? "Error: malformed input" : "";
resetSelectFlags();
return;
}
inputFlags = parseInt(flagsinput.value);
if (inputFlags > mask) {
inputerror.textContent = "Error: input too large";
resetSelectFlags();
return;
}
inputerror.textContent = "";
for (var i = 0; i < flags.length; i++) {
if (inputFlags & (1 << i)) decodelist.appendChild(getFlagNode(flags[i]));
}
if (e) {
var boxes = Array.from(selectflagslist.querySelectorAll("input"));
for (var i = 0; i < boxes.length; i++) {
var index = flags.indexOf(boxes[i].value);
if (index < 0) continue;
boxes[i].checked = !!(inputFlags & (1 << index));
}
flagsout.textContent = "0x" + inputFlags.toString(16);
}
}
flagsinput.addEventListener("keyup", updateDecodeList, false);
</script>
</body>
</html>