PNPBIOS(4)

📦 version 15.1, in freebsd 14.5, freebsd 15.1

🎀 PNPBIOS(4) — embedded motherboard devices, but make it cute 🎀

hiii bestie, this is the PNPBIOS(4) page from the i386 Kernel Interfaces Manual — aka the <pink>pnpbios</pink> manual. We're talking embedded devices on the motherboard, and yes, it's gonna be a vibe. 🦋

💖 NAME 💖

pnpbios — support for embedded devices on the motherboard

🦋 DESCRIPTION 🦋

okay so <pink>pnpbios</pink> is the driver that enumerates embedded ISA devices on the motherboard whose BIOS supports the “Plug and Play BIOS Specification”. It's literally doing a little roll call for motherboard devices, and it's giving main character energy. ✨

For each device it finds, it assigns ISA bus resources — interrupt line, DMA channel, I/O ports, and memory region — and then activates it. slay, resources assigned, device online. 💅

But here's the important part, no cap: if <pink>pnpbios</pink> cannot assign the necessary resources to a device without causing conflict with other devices in the system, that device will not be activated and will be unavailable to programs. 😭 So yeah, it's not out here doing "close enough" resource math — conflict means the device stays off.

👀 SEE ALSO 👀

go read that one too, bestie, it's giving related-manual-page energy 🫶

📚 STANDARDS 📚

  • Compaq, Phenix, and Intel, Plug and Play BIOS Specification Version 1.0A, May 5, 1994.
  • Compaq, Phenix, and Intel, Plug and Play BIOS CLARIFICATION Paper for Plug and Play BIOS Specification Version 1.0A, October 6, 1994.

🕰️ HISTORY 🕰️

The pnpbios driver first appeared in FreeBSD 4.0. iconic behavior, honestly.

👑 AUTHORS 👑

The pnpbios driver was written by Mike Smith. ty bestie, we appreciate you 🫶✨

⚠️ CAVEATS ⚠️

  • There is no explicit way to disable individual embedded devices. The <pink>pnpbios</pink> driver will find all devices reported by the “Plug and Play (PnP)” BIOS and try to activate them all. So yeah, it's not a pick-and-choose situation, fr fr.
  • There is no way to explicitly assign particular resource to a device. The resource assignment is fully automatic, and there is no provision for manual override. Automatic only, bestie — no little hand-tuning menu. 💀
lowkey important: no per-device off switch, and no manual resource assignment. The driver is doing all of it on its own.

xoxo, bestie — this page's source/version is Debian, the date is September 20, 2001, and the manual is PNPBIOS(4). signing off 💅✨🫶

📦 where this page comes from