fifo_icap_set_configuration(9)

📦 version 7.3.1, in nixpkgs unstable

💅 fifo_icap_set_configuration(9) — like, the ICAP config sender, bestie

okay so this is a page from the Kernel API Manual and honestly? it's a little baddie. it does exactly one thing and it does it iconically: ship your configuration data over to the ICAP. let's get into it ✨

🌸 SYNOPSIS

int fifo_icap_set_configuration (struct hwicap_drvdata *drvdata , u32
*frame_buffer , u32 num_words );

three args, one int back. no cap, that's the whole vibe 🎀

🫶 ARGUMENTS

  • drvdata — a pointer to the drvdata. that's it, that's the whole description, she's mysterious like that 💅
  • frame_buffer — a pointer to the data to be written to the ICAP device. this is the actual payload, the main character 👑
  • num_words — the number of words (32 bit, okurrr) to write to the ICAP device. count 'em right or it's giving chaos 🔥

🦋 DESCRIPTION

so basically this function writes the given user data to the Write FIFO in polled mode, and then starts the transfer of the data to the ICAP device. literally that's the whole job: shove the data in, kick off the transfer. she's a worker 💖

ngl, "polled mode" is the key detail here — that's not interrupt-driven, bestie, that's the function sitting there and checking. don't forget it 🌸

⭐ RETURN

0 on success, or -errno on failure. classic kernel behaviour, we love a consistent icon 😭

🧚 SEE ALSO

kernel file:

./drivers/char/xilinx_hwicap/fifo_icap.c

and the whole friend group, fr fr:

okay that's the page!! go forth and configure your ICAP, you absolute icon 🦋💜

sign-off time: this lil cutie lives under ./drivers/char/xilinx_hwicap, dated October 2026, and she's serving fifo_icap_set_configuration(9) realness. mwah 💋✨

📦 where this page comes from