SDHC(4)

💖 SDHC(4) — the sdhc manual, bestie edition 💖

okay so this is the sdhc page from section 4 of the manual (you know, the kernel interfaces manual) and honestly? it's short, it's sweet, and it's literally the whole vibe of "small driver, big job". Let's get into it 🎀

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✨ NAME ✨

sdhc — SD Host Controller 💅

🌸 SYNOPSIS 🌸

like, here's how it shows up in kernel config land, exactly as written:

sdhc* at acpi?
sdhc* at pci?
sdhc* at cardbus? function ?
sdmmc* at sdhc?

no cap, that's the whole thing 🫶

🦋 DESCRIPTION 🦋

okay so the sdhc driver is the one that provides support for SD controllers that follow the SD Host Controller Standard Simplified Specification — like, that's the spec it's repping, periodt ✨

and then the sdmmc(4) subsystem is the main character that actually does the SD/MMC transactions, so it can talk to whatever MMC, SD, SDHC, or SDIO device you've yeeted into the SD slot 🔥 literally any of those, it's giving versatility 💜

🌈 SEE ALSO 🌈

• intro(4) — the intro to section 4, go say hi 👋
• sdmmc(4) — the subsystem doing the actual talking, iykyk 💫

👑 HISTORY 👑

so the lore is: the sdhc driver was written by Uwe Stuehler ⟨uwe@openbsd.org⟩ for OpenBSD, and then ported to NetBSD by NONAKA Kimihiro ⟨nonaka@netbsd.org⟩. iconic collaboration energy fr fr 🫶✨

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and that's the page, bestie 💖 this one came from the Debian manual, dated June 21, 2016, and the page is SDHC(4) — slay, go plug in an SD card 🌸🎀