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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: Changbin Du <changbin.du@gmail.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Changbin Du 2019-05-08 23:21:33 +08:00 committed by Jonathan Corbet
parent 9d12f58fe9
commit 71892b25fc
2 changed files with 23 additions and 16 deletions
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1
Documentation/x86/index.rst
View File

@ -25,3 +25,4 @@ x86-specific Documentation
pti pti
microcode microcode
resctrl_ui resctrl_ui
usb-legacy-support

20
Documentation/x86/usb-legacy-support.txt → Documentation/x86/usb-legacy-support.rst
View File

@ -1,7 +1,11 @@
USB Legacy support
~~~~~~~~~~~~~~~~~~
Vojtech Pavlik <vojtech@suse.cz>, January 2004 .. SPDX-License-Identifier: GPL-2.0
==================
USB Legacy support
==================
:Author: Vojtech Pavlik <vojtech@suse.cz>, January 2004
Also known as "USB Keyboard" or "USB Mouse support" in the BIOS Setup is a 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: 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 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 the kernel unconditionally, this means the USB drivers need to be
compiled-in, too. 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 in the kernel config or USB Legacy support in the BIOS. A BIOS update
could help, but so far no such update exists. 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 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 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 idle=poll on the kernel command line. The BIOS may be entering the SMM
on the HLT instruction as well. on the HLT instruction as well.