FDT_MAX_NCELLS(9)

📦 version 7.3.1, in nixpkgs unstable

💅 FDT_MAX_NCELLS(9) 💅

okay bestie, welcome to the Kernel API Manual — yes the real one, we're doing libfdt lore today and honestly? it's a short one and it still eats 💖

✨ NAME ✨

FDT_MAX_NCELLS — the absolute maximum value for #address-cells and #size-cells 🎀

🦋 SYNOPSIS 🦋

FDT_MAX_NCELLS

that's it. that's the whole synopsis. a single little constant living its best life, no arguments, no nothing, main character energy fr 🔥

🌸 DESCRIPTION 🌸

so here's the vibe: this is the maximum value for #address-cells, #size-cells, and any similar properties that are gonna get processed by libfdt. that's the ceiling, the limit, the "no ma'am" line 🌈

IEE1275 says OF implementations have to handle values up to 4. that's the requirement, non-negotiable, the baseline, the bare minimum the spec is willing to accept 💅

and like — implementations may support larger values than that. it's allowed! nobody's stopping you! but lowkey? in practice higher values just aren't used. nobody's out here flexing a #address-cells of 12, it's simply not the moment 🫶

ngl bestie, the whole takeaway here is "4 is the number, don't be weird about it" ✨

👑 SEE ALSO 👑

okay so this little constant has a massive friend group — like genuinely, the whole libfdt extended universe showed up to the group chat 😭 and yes, the Kernel file in question is ./scripts/dtc/libfdt/libfdt.h. every single one of these besties is invited:

like I said. huge friend group. iykyk 🧚

and that's the whole page bestie!! this iconic little number lives over in ./scripts/dtc/libfdt and it's dated October 2026 — go off, calendar 💜✨🎀

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