tb_nvm_write_buf(9)

💅 tb_nvm_write_buf(9) — like, the Kernel API Manual era 🎀

okay so bestie, welcome to tb_nvm_write_buf from the Kernel API Manual — this is the little helper that tucks your data into the @nvm buffer before anybody actually touches the flash ✨

---

🌸 NAME 🌸

tb_nvm_write_buf — write data to the @nvm buffer, no cap 💖

---

🦋 SYNOPSIS 🦋

int tb_nvm_write_buf (struct tb_nvm *nvm , unsigned int offset , void
*val , size_t bytes );

---

✨ ARGUMENTS ✨

• nvm — the NVM structure itself, our main character 👑
• offset — where the writing starts, like the exact spot in the group chat 📍
• val — the data buffer you're writing, the content bestie 🫶
• bytes — how many bytes we're writing, the literal headcount 🔢

---

💜 DESCRIPTION 💜

so this is a helper function whose whole vibe is caching the new NVM image before it actually gets written to the flash — lowkey the pre-game before the real event 🌈

it copies bytes from val to nvm->buf, starting from offset. that's it, that's the function, and it ate 💅

---

🔥 RETURN 🔥

• 0 — on success, we love a happy ending 🎀
• -ENOMEM — if buffer allocation failed, absolutely devastating 😭
• Negative errno — another error occurred, so like, something else went sideways fr fr 💀

---

👑 SEE ALSO 👑

Kernel file ./drivers/thunderbolt/nvm.c — plus the whole squad, iykyk:

• 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_write_headers(9)
• tb_nvm_add_active(9)
• tb_nvm_add_non_active(9)
• tb_nvm_free(9)
• tb_nvm_read_data(9)
• tb_nvm_write_data(9)

---

ngl bestie, go read those too, they're all part of the same iconic little thunderbolt nvm family tree 🌳

---

okay so that's the whole page!! sourced straight from ./drivers/thunderbolt, dated October 2026, and we are obsessed with the consistency 🫶💖 periodt ✨🧚‍♀️