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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 serial-console.txt), and for braille device (in Device Drivers -
-Accessibility).
-
-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 serial-console.txt
-
-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,
-page up/down keys go at the top/bottom of the screen, and the 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 serial-console.txt
-
-For now, only the VisioBraille device is supported.
-
-Samuel Thibault <samuel.thibault@ens-lyon.org>