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Brltty support for dracut
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This module provides brltty functionality in the initrd.
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Module pickups user settings from system and install
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necessary files like drivers and used text tables to initramfs.
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For now the module is reliably functional from phase pre-mount
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in earlier phases the module is not functional
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TBD fix functionality from earlier phases than pre-mount
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Module in instalation takes some options from environment variables.
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BRLTTY_DRACUT_INCLUDE_DRIVERS forces include of screen or braille
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driver
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example:
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BRLTTY_DRACUT_INCLUDE_DRIVERS=bpm beu
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BRLTTY_DRACUT_INCLUDE_TEXT_FILES forces include of text tables
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example:
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BRLTTY_DRACUT_INCLUDE_TEXT_FILES=kok.ttb lv.tti
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BRLTTY_LOCALE needs to be used when building initram image
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to install used text table
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see https://bugzilla.redhat.com/show_bug.cgi?id=1584036
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example
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BRLTTY_LOCALE=cs_CZ.UTF-8
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Module adds boot command line parameters which are parsed
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and exported as a coresponding environment variables. The following
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is a list of supported boot command line parameters and their mapping
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to the environment variables recognized by brltty (for details about
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the variables see man brltty):
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Boot command line parameter Environment variable
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brltty.api_parameters BRLTTY_API_PARAMETERS
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brltty.attributes_table BRLTTY_ATTRIBUTES_TABLE
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brltty.braille_device BRLTTY_BRAILLE_DEVICE
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brltty.braille_driver BRLTTY_BRAILLE_DRIVER
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brltty.braille_parameters BRLTTY_BRAILLE_PARAMETERS
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brltty.configuration_file BRLTTY_CONFIGURATION_FILE
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brltty.contraction_table BRLTTY_CONTRACTION_TABLE
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brltty.midi_device BRLTTY_MIDI_DEVICE
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brltty.pcm_device BRLTTY_PCM_DEVICE
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brltty.preferences_file BRLTTY_PREFERENCES_FILE
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brltty.release_device BRLTTY_RELEASE_DEVICE
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brltty.screen_driver BRLTTY_SCREEN_DRIVER
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brltty.screen_parameters BRLTTY_SCREEN_PARAMETERS
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brltty.speech_driver BRLTTY_SPEECH_DRIVER
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brltty.speech_input BRLTTY_SPEECH_INPUT
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brltty.speech_parameters BRLTTY_SPEECH_PARAMETERS
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brltty.text_table BRLTTY_TEXT_TABLE
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Example:
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brltty.braile_driver="ba" brltty.braille_parameters="auth=none,host=IP:0"
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