SliTaz Repositories

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/linux/stuff/bootloader.sh	Sun Nov 22 12:46:40 2009 +0100
     1.3 @@ -0,0 +1,155 @@
     1.4 +#!/bin/sh
     1.5 +#
     1.6 +# This script creates a floppy image set from a linux bzImage and can merge
     1.7 +# a cmdline and/or one or more initramfs.
     1.8 +# The total size can not exceed 15M because INT 15H function 87H limitations.
     1.9 +#
    1.10 +# (C) 2009 Pascal Bellard - GNU General Public License v3.
    1.11 +
    1.12 +usage()
    1.13 +{
    1.14 +cat <<EOT
    1.15 +Usage: $0 bzImage [--prefix image_prefix] [--cmdline 'args']
    1.16 +       [--format 1440|1680|1720|2880 ] [--initrd initrdfile]...
    1.17 +
    1.18 +Example:
    1.19 +$0 /boot/vmlinuz-2.6.30.6 --cmdline 'rw lang=fr_FR kmap=fr-latin1 laptop autologin' --initrd /boot/rootfs.gz --initrd ./myconfig.gz
    1.20 +EOT
    1.21 +exit 1
    1.22 +}
    1.23 +
    1.24 +KERNEL=""
    1.25 +INITRD=""
    1.26 +CMDLINE=""
    1.27 +PREFIX="floppy"
    1.28 +FORMAT="1440"
    1.29 +while [ -n "$1" ]; do
    1.30 +	case "$1" in
    1.31 +	--cmdline) CMDLINE="$2"; shift;;
    1.32 +	--initrd)  INITRD="$INITRD $2"; shift;;
    1.33 +	--prefix)  PREFIX="$2"; shift;;
    1.34 +	--format)  FORMAT="$2"; shift;;
    1.35 +	*) KERNEL="$1";;
    1.36 +	esac
    1.37 +	shift
    1.38 +done
    1.39 +[ -n "$KERNEL" -a -f "$KERNEL" ] || usage
    1.40 +
    1.41 +# write a 32 bits data
    1.42 +# usage: storelong offset data32 file
    1.43 +storelong()
    1.44 +{
    1.45 +	printf "00000  %02X %02X %02X %02X \n" \
    1.46 +		$(( $2 & 255 )) $(( ($2>>8) & 255 )) \
    1.47 +		$(( ($2>>16) & 255 )) $(( ($2>>24) & 255 )) | \
    1.48 +	hexdump -R | dd bs=1 conv=notrunc of=$3 seek=$(( $1 )) 2> /dev/null
    1.49 +}
    1.50 +
    1.51 +# read a 32 bits data
    1.52 +# usage: getlong offset file
    1.53 +getlong()
    1.54 +{
    1.55 +	dd if=$2 bs=1 skip=$(( $1 )) count=4 2> /dev/null | \
    1.56 +		hexdump -e '"" 1/4 "%d" "\n"'
    1.57 +}
    1.58 +
    1.59 +floppyset()
    1.60 +{
    1.61 +	# bzImage offsets
    1.62 +	SetupSzOfs=497
    1.63 +	SyssizeOfs=500
    1.64 +	CodeAdrOfs=0x214
    1.65 +	RamfsAdrOfs=0x218
    1.66 +	RamfsLenOfs=0x21C
    1.67 +	ArgPtrOfs=0x228
    1.68 +
    1.69 +	# boot+setup address
    1.70 +	SetupBase=0x90000
    1.71 +
    1.72 +	stacktop=0x9E00
    1.73 +
    1.74 +	bs=/tmp/bs$$
    1.75 +
    1.76 +	# Get and patch boot sector
    1.77 +	dd if=$KERNEL bs=512 count=1 of=$bs 2> /dev/null
    1.78 +	uudecode <<EOT | dd of=$bs conv=notrunc 2> /dev/null
    1.79 +begin-base64 644 -
    1.80 +v/Sd/GgAkAcxyQYXify7eACO2cU3sQbzpY7ZiSeMRwKg8X2YQAYfxkX4P/qX
    1.81 +mEEw9jHb6FcBvgACgEwRgMdEJACcA3QO6GYBvigCORxyLkeLHFboQQFfizXo
    1.82 +UgGwIOg+AbAIzRBOmM0WPAh0BZiJBEZGOzV08OgmATwKdd+5GABqAOL8ieaw
    1.83 +D7/0Af5NHLEFtJOJRBywAYlEFJmJVBCJVBhmMdtD0+NLZgMdZtPraAAQB7+A
    1.84 +ACn7nHMCAd9TVjHb6NQAXrkAgLSH/kQczRVbnXfcoRoCSL8cArEJOEQccrAx
    1.85 +wM0T6gAAIJCwRijIvrkB6L0AXesjgPkTcgQ4wXdogP4CcgQ45ndpgP1Qc3Ng
    1.86 +BlJRU5a0AlC5BgBRsQTBxQSwDyHoBJAnFEAn6HMA4u6wIM0QWeK0mM0TYTH2
    1.87 +rZGtkq1QKMh3ArABmDn4cgKJ+FBStALNE1qVXlhynCn3AfHB5gkB8zjBdSaI
    1.88 +yP7GsQE45nUciPS2AP7FPBN1EoD9UHINtQBgvrwB6CUAmM0WYaMEAFJRZo8G
    1.89 +AAAJ/3WeFgewLrQOuwcAzRA8DXUOsArr8bAN6Oz/rAjAdfjDWDoASW5zZXJ0
    1.90 +IG5leHQgZmxvcHB5IGFuZCBwcmVzcyBhbnkga2V5IHRvIGNvbnRpbnVlLgcN
    1.91 +AA==
    1.92 +====
    1.93 +EOT
    1.94 +
    1.95 +	# Get setup
    1.96 +	setupsz=$(getlong $SetupSzOfs $bs)
    1.97 +	setupszb=$(( $setupsz & 255 ))
    1.98 +	dd if=$KERNEL bs=512 skip=1 count=$setupszb 2> /dev/null >> $bs
    1.99 +
   1.100 +	# Store cmdline after setup
   1.101 +	if [ -n "$CMDLINE" ]; then
   1.102 +		echo -n "$CMDLINE" | dd bs=512 count=1 conv=sync 2> /dev/null >> $bs
   1.103 +		storelong ArgPtrOfs $(( $SetupBase + $stacktop )) $bs
   1.104 +	fi
   1.105 +
   1.106 +	# Compute initramfs size
   1.107 +	initrdlen=0
   1.108 +	padding=0
   1.109 +	for i in $( echo $INITRD | sed 's/,/ /' ); do
   1.110 +		[ -s "$i" ] || continue
   1.111 +		initrdlen=$(( $initrdlen + $padding ))
   1.112 +		padding=$(stat -c %s $i)
   1.113 +		initrdlen=$(( $initrdlen + $padding ))
   1.114 +		padding=$(( 4096 - ($padding & 4095) ))
   1.115 +		[ $padding -eq 4096 ] && padding=0
   1.116 +	done
   1.117 +	Ksize=$(( $(getlong $SyssizeOfs $bs)*16 ))
   1.118 +	Kpad=$(( (($Ksize+4095)/4096)*4096 - Ksize ))
   1.119 +	if [ $initrdlen -ne 0 ]; then
   1.120 +		Kbase=$(getlong $CodeAdrOfs $bs)
   1.121 +		storelong $RamfsAdrOfs \
   1.122 +			$(( (0x1000000 - $initrdlen) & 0xFFFF0000 )) $bs
   1.123 +		storelong $RamfsLenOfs $initrdlen $bs
   1.124 +	fi
   1.125 +
   1.126 +	# Output boot sector + setup + cmdline
   1.127 +	dd if=$bs 2> /dev/null
   1.128 +
   1.129 +	# Output kernel code
   1.130 +	dd if=$KERNEL bs=512 skip=$(( $setupszb + 1 )) 2> /dev/null
   1.131 +
   1.132 +	# Pad to next sector
   1.133 +	Kpad=$(( 512 - ($(stat -c %s $KERNEL) & 511) ))
   1.134 +	[ $Kpad -eq 512 ] || dd if=/dev/zero bs=1 count=$Kpad 2> /dev/null
   1.135 +
   1.136 +	# Output initramfs
   1.137 +	padding=0
   1.138 +	for i in $( echo $INITRD | sed 's/,/ /' ); do
   1.139 +		[ -s "$i" ] || continue
   1.140 +		[ $padding -ne 0 ] && dd if=/dev/zero bs=1 count=$padding
   1.141 +		dd if=$i 2> /dev/null
   1.142 +		padding=$(( 4096 - ($(stat -c %s $i) & 4095) ))
   1.143 +		[ $padding -eq 4096 ] && padding=0
   1.144 +	done
   1.145 +
   1.146 +	# Cleanup
   1.147 +	rm -f $bs
   1.148 +}
   1.149 +
   1.150 +floppyset | split -b ${FORMAT}k /dev/stdin floppy$$
   1.151 +i=1
   1.152 +ls floppy$$* | while read file ; do
   1.153 +	output=$PREFIX.$(printf "%03d" $i)
   1.154 +	cat $file /dev/zero | dd bs=1k count=$FORMAT conv=sync of=$output 2> /dev/null
   1.155 +	echo $output
   1.156 +	rm -f $file
   1.157 +	i=$(( $i + 1 ))
   1.158 +done