Ryan Malloy
6881489bf6
What the Raspberry Pi time-server guides get wrong on a Pi 4, with the measurements. The headline artifact is a four-line pps-gpio patch: PREEMPT_RT force-threads IRQ handlers, and pps-gpio takes its timestamp inside its handler, so the realtime kernel puts a scheduler between the electrical edge and the clock. IRQF_NO_THREAD takes RMS offset from 2468 ns to 199 ns. - kernel/ the patch - dashboard/ live status page (position hidden by default) - docs-site/ the write-up (Astro/Starlight, brass, no tutorial section)
48 lines
1.7 KiB
Plaintext
48 lines
1.7 KiB
Plaintext
---
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// "A Supported Systems Joint" — the maker's plate.
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//
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// Clockmakers signed the BACKPLATE: the flat brass face of the movement that
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// only shows when you open the case. It's the part a repairer sees a century
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// later, not the part the owner looks at. A site footer is the same thing —
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// the back of the movement — so this is an engraved plate rather than a
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// marketing strip, and nothing on it moves. A signature should be quiet.
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//
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// Shared verbatim with the dashboard's footer (static HTML/CSS port, same
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// markup and class names). Styles live in src/styles/brass.css.
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---
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<aside class="ss-plate" aria-label="Supported Systems">
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<a class="ss-plate__link" href="https://supported.systems" rel="noopener">
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<img
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class="ss-plate__logo"
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src="/supported-systems-logo.svg"
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alt=""
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width="52"
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height="39"
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loading="lazy"
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/>
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<span class="ss-plate__copy">
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<span class="ss-plate__heading">A Supported Systems Joint</span>
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<span class="ss-plate__body">
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The Cuckoo Escapement is built and maintained by
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<span class="ss-plate__name">Supported Systems</span> — a boutique
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software studio focused on thoughtful, user-first technology. We measure
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things before we believe them.
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</span>
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<span class="ss-plate__cta">
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Visit supported.systems
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<svg viewBox="0 0 16 16" width="14" height="14" aria-hidden="true">
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<path
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d="M4 8h7M8 5l3 3-3 3"
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fill="none"
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stroke="currentColor"
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stroke-width="1.5"
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stroke-linecap="round"
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stroke-linejoin="round"></path>
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</svg>
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</span>
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</span>
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</a>
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</aside>
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