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#!/bin/sh
PREREQ=""
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" or "mode_option" option (name depends on the framebuffer driver)
# has the form <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m]
# and may or may not start with "mode=" or "mode_option="
# -> please adjust as necessary in the parse_video_opts() function
#
# 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> or mode_option=<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
# Adjust: mode= option?
echo -n "mode=$opt "
# ... or mode_option= option?
# echo -n "mode_option=$opt "
# Presumably a boolean
else
echo -n "${opt}=1 "
fi
done
}
FB=""
OPTS=""
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
# Module-specific workarounds
case ${FB} in
matroxfb)
# Map command line name to module name
FB=matroxfb_base
;;
intelfb|i810fb|i915)
# Needs AGP driver loaded
modprobe intel-agp
;;
uvesafb)
# v86d requires /dev/zero and dev/mem, but udev haven't been started yet
[ -e /dev/zero ] || mknod -m 0666 /dev/zero c 1 5
[ -e /dev/mem ] || mknod -m 0640 /dev/mem c 1 1
;;
*)
;;
esac
if [ -n "${FB}" ]; then
unset MODPROBE_OPTIONS
modprobe -q fbcon
modprobe -q ${FB} ${OPTS}
fi
if [ -e /proc/fb ]; then
while read fbno desc; do
if [ $(($fbno < 32)) ]; then
mknod -m 0640 /dev/fb${fbno} c 29 ${fbno}
fi
done < /proc/fb
else
mknod -m 0640 /dev/fb0 c 29 0
fi