tb_nvm_write_headers(9)

💅 tb_nvm_write_headers — the "headers first bestie" era ✨

okay so this is a page from the Kernel API Manual (yes, tb_nvm_write_headers(9), we're being fancy today) and it's genuinely so simple it's iconic 🎀

---

🌸 NAME 🌸

tb_nvm_write_headers — write the headers before the rest of the image, no cap 💖

---

✨ SYNOPSIS ✨

int tb_nvm_write_headers (struct tb_nvm *nvm );

like, that's it. one function, one argument, main character energy 👑

---

🦋 ARGUMENTS 🦋

• nvm — the NVM structure. that's the whole description. it's giving minimalist 🫶

---

💜 DESCRIPTION 💜

okay so here's the vibe: some vendor NVM formats are extra and require that you write the headers before the rest of the image. if that's your device, this function does exactly that. periodt ✨

and the best part? you can call it even if the device does not need this. so it's not gonna be weird about it — call it anyway, it's fine, it slays either way 💅

---

🔥 RETURN 🔥

• 0 on success 🎉
• a negative errno otherwise 😭 (iykyk, check your errnos)

---

🌈 SEE ALSO 🌈

• the kernel file ./drivers/thunderbolt/nvm.c — go read it, it's right there 💖
• struct tb_nvm_vendor_ops(9)
• struct tb_nvm_vendor(9)
• tb_nvm_alloc(9)
• tb_nvm_read_version(9)
• tb_nvm_validate(9)
• tb_nvm_add_active(9)
• tb_nvm_write_buf(9)
• tb_nvm_add_non_active(9)
• tb_nvm_free(9)
• tb_nvm_read_data(9)
• tb_nvm_write_data(9)

like the whole friend group fr fr 🫶

---

ngl this one's short but it's still important — go write those headers first, bestie 🧚

okay that's the page!! brought to you by the good people over in ./drivers/thunderbolt, dated October 2026 — mwah, drink water, and don't forget your errno checks 💜⭐🎀