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# SPDX-License-Identifier: GPL-2.0-only
# Plug and Play BIOS configuration
config PNPBIOS
bool "Plug and Play BIOS support"
depends on ISA && X86_32
default n
Linux uses the PNPBIOS as defined in "Plug and Play BIOS
Specification Version 1.0A May 5, 1994" to autodetect built-in
mainboard resources (e.g. parallel port resources).
Some features (e.g. event notification, docking station information,
ISAPNP services) are not currently implemented.
If you would like the kernel to detect and allocate resources to
your mainboard devices (on some systems they are disabled by the
BIOS) say Y here. Also the PNPBIOS can help prevent resource
conflicts between mainboard devices and other bus devices.
Note: ACPI is expected to supersede PNPBIOS some day, currently it
co-exists nicely. If you have a non-ISA system that supports ACPI,
you probably don't need PNPBIOS support.
bool "Plug and Play BIOS /proc interface"
depends on PNPBIOS && PROC_FS
If you say Y here and to "/proc file system support", you will be
able to directly access the PNPBIOS. This includes resource
allocation, ESCD, and other PNPBIOS services. Using this
interface is potentially dangerous because the PNPBIOS driver will
not be notified of any resource changes made by writing directly.
Also some buggy systems will fault when accessing certain features
in the PNPBIOS /proc interface (e.g. "boot" configs).
See the latest pcmcia-cs (stand-alone package) for a nice set of
PNPBIOS /proc interface tools (lspnp and setpnp).
Unless you are debugging or have other specific reasons, it is
recommended that you say N here.