| Thomas Gleixner | ec8f24b | 2019-05-19 13:07:45 +0100 | [diff] [blame] | 1 | # SPDX-License-Identifier: GPL-2.0-only |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | # |
| 3 | # Plug and Play BIOS configuration |
| 4 | # |
| 5 | config PNPBIOS |
| Kees Cook | 35de87d | 2013-01-18 13:57:39 +0100 | [diff] [blame] | 6 | bool "Plug and Play BIOS support" |
| William Breathitt Gray | 0619f39 | 2016-05-01 11:46:17 -0400 | [diff] [blame] | 7 | depends on ISA && X86_32 |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | default n |
| 9 | ---help--- |
| 10 | Linux uses the PNPBIOS as defined in "Plug and Play BIOS |
| 11 | Specification Version 1.0A May 5, 1994" to autodetect built-in |
| 12 | mainboard resources (e.g. parallel port resources). |
| 13 | |
| 14 | Some features (e.g. event notification, docking station information, |
| 15 | ISAPNP services) are not currently implemented. |
| 16 | |
| 17 | If you would like the kernel to detect and allocate resources to |
| 18 | your mainboard devices (on some systems they are disabled by the |
| 19 | BIOS) say Y here. Also the PNPBIOS can help prevent resource |
| 20 | conflicts between mainboard devices and other bus devices. |
| 21 | |
| 22 | Note: ACPI is expected to supersede PNPBIOS some day, currently it |
| 23 | co-exists nicely. If you have a non-ISA system that supports ACPI, |
| 24 | you probably don't need PNPBIOS support. |
| 25 | |
| 26 | config PNPBIOS_PROC_FS |
| 27 | bool "Plug and Play BIOS /proc interface" |
| 28 | depends on PNPBIOS && PROC_FS |
| 29 | ---help--- |
| 30 | If you say Y here and to "/proc file system support", you will be |
| 31 | able to directly access the PNPBIOS. This includes resource |
| 32 | allocation, ESCD, and other PNPBIOS services. Using this |
| 33 | interface is potentially dangerous because the PNPBIOS driver will |
| 34 | not be notified of any resource changes made by writing directly. |
| 35 | Also some buggy systems will fault when accessing certain features |
| 36 | in the PNPBIOS /proc interface (e.g. "boot" configs). |
| 37 | |
| 38 | See the latest pcmcia-cs (stand-alone package) for a nice set of |
| 39 | PNPBIOS /proc interface tools (lspnp and setpnp). |
| 40 | |
| 41 | Unless you are debugging or have other specific reasons, it is |
| 42 | recommended that you say N here. |
| 43 | |