linux boot sequence

1. inittab - system boot based on setting on this file. The default level is 3.
Default runlevel. The runlevels used by RHS are:
# 0 - halt (Do NOT set initdefault to this)
# 1 - Single user mode
# 2 - Multiuser, without NFS (The same as 3, if you do not have networking)
# 3 - Full multiuser mode
# 4 - unused
# 5 - X11
# 6 - reboot (Do NOT set initdefault to this)
#
id:3:initdefault:

# System initialization.
si::sysinit:/etc/rc.d/rc.sysinit

l0:0:wait:/etc/rc.d/rc 0
l1:1:wait:/etc/rc.d/rc 1
l2:2:wait:/etc/rc.d/rc 2
l3:3:wait:/etc/rc.d/rc 3
l4:4:wait:/etc/rc.d/rc 4
l5:5:wait:/etc/rc.d/rc 5
l6:6:wait:/etc/rc.d/rc 6

# Trap CTRL-ALT-DELETE
ca::ctrlaltdel:/sbin/shutdown -t3 -r now

# When our UPS tells us power has failed, assume we have a few minutes
# of power left. Schedule a shutdown for 2 minutes from now.
# This does, of course, assume you have powerd installed and your
# UPS connected and working correctly.
pf::powerfail:/sbin/shutdown -f -h +2 "Power Failure; System Shutting Down"

# If power was restored before the shutdown kicked in, cancel it.
pr:12345:powerokwait:/sbin/shutdown -c "Power Restored; Shutdown Cancelled"


# Run gettys in standard runlevels
1:2345:respawn:/sbin/mingetty tty1
2:2345:respawn:/sbin/mingetty tty2
3:2345:respawn:/sbin/mingetty tty3
4:2345:respawn:/sbin/mingetty tty4
5:2345:respawn:/sbin/mingetty tty5
6:2345:respawn:/sbin/mingetty tty6

# Run xdm in runlevel 5
x:5:respawn:/etc/X11/prefdm -nodaemon
2. Run rc.sysinit
#!/bin/bash
#
# /etc/rc.d/rc.sysinit - run once at boot time
#
# Taken in part from Miquel van Smoorenburg's bcheckrc.
#

HOSTNAME=`/bin/hostname`
HOSTTYPE=`uname -m`
unamer=`uname -r`

set -m

if [ -f /etc/sysconfig/network ]; then
. /etc/sysconfig/network
fi
if [ -z "$HOSTNAME" -o "$HOSTNAME" = "(none)" ]; then
HOSTNAME=localhost
fi

if [ ! -e /proc/mounts ]; then
mount -n -t proc /proc /proc
mount -n -t sysfs /sys /sys >/dev/null 2>&1
fi
if [ ! -d /proc/bus/usb ]; then
modprobe usbcore >/dev/null 2>&1 && mount -n -t usbfs /proc/bus/usb /proc/bus/usb
else
mount -n -t usbfs /proc/bus/usb /proc/bus/usb
fi

. /etc/init.d/functions

# Check SELinux status
selinuxfs="$(fstab_decode_str `LC_ALL=C awk '/ selinuxfs / { print $2 }' /proc/mounts`)"
SELINUX_STATE=
if [ -n "$selinuxfs" ] && [ "`cat /proc/self/attr/current`" != "kernel" ]; then
if [ -r "$selinuxfs/enforce" ] ; then
SELINUX_STATE=`cat "$selinuxfs/enforce"`
else
# assume enforcing if you can't read it
SELINUX_STATE=1
fi
fi

if [ -n "$SELINUX_STATE" -a -x /sbin/restorecon ] && __fgrep " /dev " /proc/mounts >/dev/null 2>&1 ; then
/sbin/restorecon -R /dev 2>/dev/null
fi
..................
3. ......
4. /etc/modprobe.conf ---alias result scan from hardware probe
alias scsi_hostadapter1 ata_piix
alias scsi_hostadapter2 usb-storage
options snd-intel8x0 index=0
alias eth0 e100
alias snd-card-0 snd-intel8x0
options snd-card-0 index=0
alias wlan0 rt2500

linux kernel image compile

1.Copy .config file from installed kernel to new kernel source directory
2. Make oldconfig
3. make menuconfig, pick and remove things you want or unwant
4. make all
5. make modules_install
6. make install -- this will create kernel image and ramdisk for fedora core as well as configure /boot/grub/menu.lst.
7.