Current File : //usr/share/initramfs-tools/scripts/init-top/framebuffer
#!/bin/sh
# shellcheck disable=SC2034
OPTION=FRAMEBUFFER
PREREQ="udev"
prereqs()
{
echo "$PREREQ"
}
case $1 in
# get pre-requisites
prereqs)
prereqs
exit 0
;;
esac
# The options part of the kernel "video=" argument (i.e. everyting
# after "video=<fbdriver>:") has very inconsistent rules.
#
# Generally the following applies:
# 1) options are comma-separated
# 2) options can be in either of these three forms:
# <arg>=<value>, <arg>:<value>, <boolean-arg>.
# 3) the "mode" option has the form <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m]
# and may or may not start with "mode="
#
# When the options are used with modules, they need to be space-separated
# and the following conversions are needed:
# <arg>:<value> -> <arg>=<value>
# <boolean-arg> -> <boolean-arg>=1
# <modevalue> -> mode=<modevalue>
parse_video_opts()
{
local OPTS="$1"
local IFS=","
# Must be a line like video=<fbdriver>:<opt1>,[opt2]...
if [ "${OPTS}" = "${OPTS%%:*}" ]; then
return
fi
OPTS="${OPTS#*:}"
for opt in ${OPTS}; do
# Already in the "<arg>=<value>" form
if [ "${opt}" != "${opt#*=}" ]; then
echo -n "$opt "
# In the "<arg>:<value>" form
elif [ "${opt}" != "${opt#*:}" ]; then
echo -n "${opt%:*}=${opt#*:} "
# Presumably a modevalue without the "mode=" prefix
elif [ "${opt}" != "${opt#[0-9]*x[0-9]}" ]; then
echo -n "mode=$opt "
# Presumably a boolean
else
echo -n "${opt}=1 "
fi
done
}
FB=""
OPTS=""
# shellcheck disable=SC2013
for x in $(cat /proc/cmdline); do
case ${x} in
vga=*)
FB="vesafb";
OPTS="";
;;
video=*)
FB=${x#*=}
FB="${FB%%:*}"
OPTS="$(parse_video_opts "${x}")"
esac
done
# Map command line name to module name
case ${FB} in
matroxfb)
FB=matroxfb_base
;;
esac
if [ -n "${FB}" ]; then
# Some framebuffer devices need character devices :-/
udevadm settle
# shellcheck disable=SC2086
MODPROBE_OPTIONS=-q modprobe ${FB} ${OPTS}
# Wait for the framebuffer devices to be ready
udevadm settle
else
# If we have no graphics devices yet, wait for udev to settle
[ -d /sys/class/graphics/fbcon ] && \
[ -d /sys/class/graphics/fb0 ] && \
[ -d /sys/class/drm/card0 ] || udevadm settle
# If we still have no graphics device, fall back to vesafb like
# we do in the post-initramfs case in
# /etc/init/udev-fallback-graphics.conf.
# There is a higher risk of racing the regular video driver init
# than there is in the post-initramfs case, because this is earlier
# in boot and the kernel has had less time to finish probing the
# video drivers; and if we probe vesafb when we aren't meant to it
# will cause problems later. So just to be sure, add a sleep(1)
# which seems to be enough time to let the drm interface get loaded.
[ -d /sys/class/graphics/fbcon ] && \
[ -d /sys/class/graphics/fb0 ] && \
[ -d /sys/class/drm/card0 ] || sleep 1
if ! [ -d /sys/class/graphics/fbcon ] \
|| ! [ -d /sys/class/graphics/fb0 ] \
|| ! [ -d /sys/class/drm/card0 ]
then
modprobe -q vesafb 2>/dev/null
udevadm settle
fi
fi
# Force fb mode via /sys interface
# shellcheck disable=SC2013
for x in $(cat /proc/cmdline); do
case ${x} in
fbmode=*)
MODE=${x#*=}
echo "$MODE" > /sys/class/graphics/fb0/mode
;;
esac
done
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