usb4_switch_...authenticate(9)

📦 version 7.3.1, in nixpkgs unstable

💅 usb4_switch_nvm_authenticate 💅

okay bestie, so this is a page straight out of the Kernel API Manual, and the star of the show is usb4_switch_nvm_authenticate. yes that's a whole mouthful, we love her anyway 🫶

✨ NAME ✨

usb4_switch_nvm_authenticate — Authenticate new NVM

like... that's the whole vibe. authenticate the new NVM. icon behavior ✨

🦋 SYNOPSIS 🦋

int usb4_switch_nvm_authenticate (struct tb_switch *sw );

🎀 ARGUMENTS 🎀

  • sw — the USB4 router. that's it. that's the one. the router in question 💅

💖 DESCRIPTION 💖

so here's the tea ☕ — once you've already written your new NVM using usb4_switch_nvm_write, then this function comes in and triggers the whole NVM authentication process. main character energy, honestly.

the router gets power cycled, and — if the authentication actually goes through — the new NVM starts running. slay 🔥

okay but listen, this part matters: the caller should call usb4_switch_nvm_authenticate_status to read the status of the authentication after the power cycle. and no cap, it genuinely should be the first router operation — like, first in line, no cutting — otherwise the status can be lost 😭💀

fr fr, do the status read first. the status does not wait around for you.

⭐ RETURN ⭐

  • 0 on success 🎉
  • negative errno otherwise 🙈

🌈 SEE ALSO 🌈

ooh okay, the whole friend group showed up. kernel file: ./drivers/thunderbolt/usb4.c 💜

okay that's the whole page bestie!! this little gem lives in ./drivers/thunderbolt, dated October 2026, and it's filed under usb4_switch_...authenticate(9) in case you ever need to find her again 💖✨🎀

📦 where this page comes from