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</header><main data-topic="security-boot" id="main-content"><header class="article-hero"><nav aria-label="Breadcrumb" class="article-hero__crumbs"><a href="index.html">Home</a> · <a href="news.html">News</a> · <a href="news.html#topic-security-boot">Security &amp; Boot</a></nav><span class="kicker kicker--green"><a class="kicker" href="news.html#topic-security-boot">Security &amp; Boot</a></span><h1 class="article-hero__title">eBootloader secure boot: a measured-launch walkthrough</h1><p class="article-hero__dek">An end-to-end tour of eBoot's chain of trust — root-of-trust keys, immutable stage 0, signed manifests, anti-rollback counters, and the runtime attestation hooks EAI consumes during model load.</p><div class="byline"><span class="byline__avatar">EE</span><span>EoS Editorial</span><span class="byline__sep">·</span><time datetime="2026-05-06">2026-05-06</time><span class="byline__sep">·</span><span>11 min read</span></div><div aria-label="Decorative cover for Security &amp; Boot" class="article-hero__media" role="img"><img alt="Secure chip with cryptographic engraving — eBoot deep-dive" decoding="async" height="520" loading="lazy" src="img/photos/secure-boot.svg" width="1200"/></div></header><div class="layout-article"><article class="layout-article__main prose"><h2>Chain of trust</h2><p>eBootloader's chain of trust starts before any code runs. The root-of-trust public key is fused into one-time-programmable (OTP) memory at provisioning. Stage 0 — a 4 KB immutable bootrom — verifies the next stage's signature against that key before transferring control.</p><h2>Stage progression</h2><ol><li><strong>Stage 0 (4 KB, OTP):</strong> verifies stage 1 signature. Anti-rollback counter is incremented in OTP.</li><li><strong>Stage 1 (32 KB, signed):</strong> verifies signed manifest, sets up MMU, loads stage 2 from primary or fallback partition.</li><li><strong>Stage 2 (eOS RTOS image, signed manifest):</strong> verifies all loaded modules against the manifest before scheduling user code.</li><li><strong>Runtime attestation:</strong> EAI calls <code>eboot_attest()</code> at model load to assert the live image hash matches what was booted.</li></ol><h2>Anti-rollback counters</h2><p>Each signed manifest carries a monotonic counter. The OTP-backed comparator refuses to load any image with a counter lower than the high-water mark. This is the only defense against a signed-but-vulnerable older image being re-flashed by an attacker who controls the storage bus.</p> <pre><code>// eBoot anti-rollback (stage 0 pseudocode)
hwm = otp_read_u32(OTP_HWM_OFFSET);
if (manifest.counter &lt; hwm) {
    panic("anti-rollback violation");
}
if (manifest.counter &gt; hwm) {
    otp_write_u32(OTP_HWM_OFFSET, manifest.counter);
}</code></pre> <h2>Runtime attestation</h2><p>Once stage 2 is running, downstream subsystems can request a measurement of the boot chain via <code>eboot_attest()</code>. The returned blob is signed by a key derived from the device root, suitable for forwarding to a remote verifier. EAI uses this before unsealing model weights — we describe the integration in <a href="article-eai-llm-bench.html">our EAI release post</a>.</p><h2>Non-goals</h2><p>eBoot is not a TEE. There is no parallel secure-world execution context. If your threat model includes a kernel-level adversary running concurrently with secure code, you want EoS-S, not eBoot.</p><div aria-label="Topic" class="article-tags"><span class="byline" style="margin:0">Filed under:</span><a class="topic-chip" href="news.html#topic-security-boot">Security &amp; Boot</a></div><section class="article-readnext"><h2>Read next</h2><div class="article-readnext__grid"><a class="article-card" data-topic="security-boot" href="article-edb-encryption-at-rest.html"><div class="article-card__media"><img alt="Storage media — encryption at rest" height="340" loading="lazy" src="img/photos/alt-encrypt.svg" width="600"/></div><div class="article-card__body"><span class="kicker">Security &amp; Boot</span><h3 class="article-card__title">eDB ships AES-XTS at-rest encryption — even on 64 KB devices</h3><p class="article-card__dek">eDB's new storage layer adds page-level AES-XTS encryption with hardware-key offload on supported MCUs. The catch: it had to fit in 6 KB of code on the smallest target. Here's how.</p><p class="article-card__byline">EoS Editorial · 2026-05-02 · 7 min read</p></div></a><a class="article-card" data-topic="apps-platforms" href="article-eos-platform-launch.html"><div class="article-card__media"><img alt="Embedded systems engineering — platform" height="340" loading="lazy" src="img/photos/alt-platform.svg" width="600"/></div><div class="article-card__body"><span class="kicker">Apps &amp; Platforms</span><h3 class="article-card__title">eos-platform 1.0 lands: one toolchain, every EoS profile</h3><p class="article-card__dek">After eighteen months of incremental releases, the eos-platform meta-distribution reaches 1.0 with stable APIs, a unified package manifest, and reproducible builds across all 14 EoS components.</p><p class="article-card__byline">EoS Editorial · 2026-05-12 · 7 min read</p></div></a><a class="article-card" data-topic="embedded-ai" href="article-eai-llm-bench.html"><div class="article-card__media"><img alt="AI / LLM data visualisation" height="340" loading="lazy" src="img/photos/alt-llm.svg" width="600"/></div><div class="article-card__body"><span class="kicker kicker--purple">Embedded AI</span><h3 class="article-card__title">EAI 0.9 ships INT4 LLM runtime — 11 tok/s on a Cortex-M85</h3><p class="article-card__dek">EAI's new quantized inference path squeezes a 1.3B-parameter model into 312 MB of flash and runs at interactive speed on a 480 MHz microcontroller. We dig into the kernel scheduler that made it possible.</p><p class="article-card__byline">EoS Editorial · 2026-05-10 · 9 min read</p></div></a></div></section></article><aside aria-label="Sidebar" class="layout-article__sidebar"><section class="widget widget--newsletter"><h3 class="widget__title">Newsletter</h3><p>Weekly publication, no spam.</p><form action="#" class="newsletter-form" id="newsletterForm-0" method="post"><input aria-label="Email" placeholder="you@domain.com" type="email"/><button type="submit">Subscribe</button></form></section><section class="widget widget--latest"><h3 class="widget__title">Latest</h3><ul class="widget__list"><li><a href="article-eos-platform-launch.html">eos-platform 1.0 lands: one toolchain, every EoS profile</a></li><li><a href="article-eai-llm-bench.html">EAI 0.9 ships INT4 LLM runtime — 11 tok/s on a Cortex-M85</a></li><li><a href="article-eni-1024-channel-pipeline.html">ENI's 1,024-channel pipeline: deterministic spike sorting in 800 µs</a></li><li><a href="article-eosim-hil-bridge.html">EoSim 2.4 HIL bridge: virtual peripherals talking to real silicon</a></li><li><a href="article-edb-encryption-at-rest.html">eDB ships AES-XTS at-rest encryption — even on 64 KB devices</a></li></ul></section><section class="widget widget--topics"><h3 class="widget__title">Topics</h3><div class="topic-chips"><a class="topic-chip" href="news.html#topic-rtos-kernel">RTOS &amp; 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