Commit 71892b25 authored by Changbin Du's avatar Changbin Du Committed by Jonathan Corbet
Browse files

Documentation: x86: convert usb-legacy-support.txt to reST 



This converts the plain text documentation to reStructuredText format and
add it to Sphinx TOC tree. No essential content change.

Signed-off-by: default avatarChangbin Du <changbin.du@gmail.com>
Reviewed-by: default avatarMauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
parent 9d12f58f

Documentation/x86/index.rst

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@@ -25,3 +25,4 @@ x86-specific Documentation 
   pti

   microcode

   resctrl_ui

   usb-legacy-support

Documentation/x86/usb-legacy-support.txt→Documentation/x86/usb-legacy-support.rst

+23 −17
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.. SPDX-License-Identifier: GPL-2.0



==================

USB Legacy support

~~~~~~~~~~~~~~~~~~

==================



Vojtech Pavlik <vojtech@suse.cz>, January 2004

:Author: Vojtech Pavlik <vojtech@suse.cz>, January 2004





Also known as "USB Keyboard" or "USB Mouse support" in the BIOS Setup is a
@@ -27,18 +31,20 @@ It has several drawbacks, though: 


Solutions:



Problem 1) can be solved by loading the USB drivers prior to loading the

Problem 1)

  can be solved by loading the USB drivers prior to loading the

  PS/2 mouse driver. Since the PS/2 mouse driver is in 2.6 compiled into

  the kernel unconditionally, this means the USB drivers need to be

  compiled-in, too.



Problem 2) can currently only be solved by either disabling HIGHMEM64G

Problem 2)

  can currently only be solved by either disabling HIGHMEM64G

  in the kernel config or USB Legacy support in the BIOS. A BIOS update

  could help, but so far no such update exists.



Problem 3) is usually fixed by a BIOS update. Check the board

Problem 3)

  is usually fixed by a BIOS update. Check the board

  manufacturers web site. If an update is not available, disable USB

  Legacy support in the BIOS. If this alone doesn't help, try also adding

  idle=poll on the kernel command line. The BIOS may be entering the SMM

  on the HLT instruction as well.