nand_readid_op(9)

📦 version 7.3.1, in nixpkgs unstable

💅 nand_readid_op(9) — from the Kernel API Manual, bestie

okay so this one lives in the Kernel API Manual and it's called nand_readid_op, and honestly? It's a little main-character function. Let's get into it 🎀

✨ NAME ✨

nand_readid_op — do a READID operation. That's it. That's the whole vibe. It reads the ID. 💫

🌸 SYNOPSIS 🌸

int nand_readid_op (struct nand_chip *chip , u8 addr , void *buf ,
       unsigned int len );

Like, look at that signature. Four whole arguments. She's serving parameters. 😌

🦋 ARGUMENTS 🦋

  • chip — the NAND chip. your girl. the one you're doing the READID on. 👑
  • addr — the address cycle you pass after the READID command. Yes, after. Not before. Order matters, iykyk. ⭐
  • buf — the buffer where the ID gets stored. bring your own container, she's not providing one. 🍓
  • len — length of the buffer. be honest about your size okay, it's important. 🙈

💖 DESCRIPTION 💖

So basically this function sends a READID command and then reads back the ID that the NAND returned. That's the whole bit. Simple, iconic, does exactly what it says. ✨

But — and this is the part that matters — this function does not select/unselect the CS line. Like, at all. It's not doing that for you. If you needed that, you're on your own, bestie. 💀 (Real ones, go look at nand_select_target(9) and nand_deselect_target(9).)

Returns 0 on success, and a negative error code otherwise. So if you get a negative number back, that's not a personality trait, that's a problem. 😭

🔥 SEE ALSO 🔥

Kernel file ./drivers/mtd/nand/raw/nand_base.c — and then the entire friend group:

That's the whole group chat and yes, you are expected to know all of them. 💜

okay that's the page!! and for the little sign-off moment: this beauty comes out of the ./drivers/mtd/nand/raw directory, dated October 2026, and it's filed under nand_readid_op(9). slay, go read some IDs. 💅✨

📦 where this page comes from