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>
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@ -25,3 +25,4 @@ x86-specific Documentation
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pti
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microcode
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resctrl_ui
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usb-legacy-support
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@ -1,7 +1,11 @@
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USB Legacy support
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~~~~~~~~~~~~~~~~~~
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Vojtech Pavlik <vojtech@suse.cz>, January 2004
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.. SPDX-License-Identifier: GPL-2.0
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==================
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USB Legacy support
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==================
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:Author: Vojtech Pavlik <vojtech@suse.cz>, January 2004
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Also known as "USB Keyboard" or "USB Mouse support" in the BIOS Setup is a
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@ -27,18 +31,20 @@ It has several drawbacks, though:
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Solutions:
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Problem 1) can be solved by loading the USB drivers prior to loading the
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Problem 1)
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can be solved by loading the USB drivers prior to loading the
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PS/2 mouse driver. Since the PS/2 mouse driver is in 2.6 compiled into
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the kernel unconditionally, this means the USB drivers need to be
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compiled-in, too.
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Problem 2) can currently only be solved by either disabling HIGHMEM64G
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Problem 2)
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can currently only be solved by either disabling HIGHMEM64G
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in the kernel config or USB Legacy support in the BIOS. A BIOS update
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could help, but so far no such update exists.
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Problem 3) is usually fixed by a BIOS update. Check the board
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Problem 3)
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is usually fixed by a BIOS update. Check the board
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manufacturers web site. If an update is not available, disable USB
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Legacy support in the BIOS. If this alone doesn't help, try also adding
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idle=poll on the kernel command line. The BIOS may be entering the SMM
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on the HLT instruction as well.
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