hl_fw_dynamic_init_cpu(9)

📦 version 7.3.1, in nixpkgs unstable

💅 hl_fw_dynamic_init_cpu — like, the whole kernel API manual moment ✨

okay bestie, so this is the hl_fw_dynamic_init_cpu(9) page from the Kernel API Manual, and it is literally about booting up a device CPU. let's get into it 🫶

🌸 NAME 🌸

hl_fw_dynamic_init_cpu — initialize the device CPU using dynamic protocol. that's it, that's the whole vibe. 🎀

✨ SYNOPSIS ✨

int hl_fw_dynamic_init_cpu (struct hl_device *hdev , struct fw_load_mgr
*fw_loader );

no cap, that's the exact signature, character for character. she returns an int and she takes two pointers. iconic. 👑

🦋 ARGUMENTS 🦋

  • hdev — pointer to the habanalabs device structure. this is the device's whole personality, basically. main character energy fr fr.
  • fw_loader — managing structure for loading device's FW. it's the little manager that keeps the firmware-loading situation organized. 💅

💖 DESCRIPTION 💖

return 0 on success, otherwise non-zero error code. simple as that, ngl.

brief: the dynamic protocol is master (LKD) slave (FW CPU) protocol. the communication is done using registers:
  • LKD command register 🔥
  • FW status register

the protocol is race free. the way she achieves this is by splitting the requests and response to known synchronization points between the LKD and the FW. 🧚 every single response to an LKD request is known and bound to a predefined timeout. and if that timeout expires without the desired status from FW? the protocol (and hence the boot) will fail. 💀 like, no status, no boot, periodt.

🌈 SEE ALSO 🌈

kernel file: ./drivers/accel/habanalabs/common/firmware_if.c

and now the friend group — every one of these, bestie, all of them:

and that's the page, bestie 💜 this little number lives in ./drivers/accel/habanalabs/common, dated October 2026, and it's filed under hl_fw_dynamic_init_cpu(9) — go off, dynamic protocol, you ate 🍓✨

📦 where this page comes from