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authorMauro Carvalho Chehab <mchehab@s-opensource.com>2016-09-21 09:51:11 -0300
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2016-10-24 08:12:35 -0200
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docs-rst: create an user's manual book
Place README, REPORTING-BUGS, SecurityBugs and kernel-parameters on an user's manual book. As we'll be numbering the user's manual, remove the manual numbering from SecurityBugs. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
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-Linux Braille Console
-=====================
-
-To get early boot messages on a braille device (before userspace screen
-readers can start), you first need to compile the support for the usual serial
-console (see :ref:`Documentation/serial-console.txt <serial_console>`), and
-for braille device
-(in :menuselection:`Device Drivers --> Accessibility support --> Console on braille device`).
-
-Then you need to specify a ``console=brl``, option on the kernel command line, the
-format is::
-
- console=brl,serial_options...
-
-where ``serial_options...`` are the same as described in
-:ref:`Documentation/serial-console.txt <serial_console>`.
-
-So for instance you can use ``console=brl,ttyS0`` if the braille device is connected to the first serial port, and ``console=brl,ttyS0,115200`` to
-override the baud rate to 115200, etc.
-
-By default, the braille device will just show the last kernel message (console
-mode). To review previous messages, press the Insert key to switch to the VT
-review mode. In review mode, the arrow keys permit to browse in the VT content,
-:kbd:`PAGE-UP`/:kbd:`PAGE-DOWN` keys go at the top/bottom of the screen, and
-the :kbd:`HOME` key goes back
-to the cursor, hence providing very basic screen reviewing facility.
-
-Sound feedback can be obtained by adding the ``braille_console.sound=1`` kernel
-parameter.
-
-For simplicity, only one braille console can be enabled, other uses of
-``console=brl,...`` will be discarded. Also note that it does not interfere with
-the console selection mechanism described in
-:ref:`Documentation/serial-console.txt <serial_console>`.
-
-For now, only the VisioBraille device is supported.
-
-Samuel Thibault <samuel.thibault@ens-lyon.org>