LinuxAdmin110609: fedora kernel的install过程注记

LinuxAdmin110609: fedora kernel的install过程注记


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版本记录
Date        Ver        Note
2011-06-09    0.1        Draft.  zcatt, Beijing

环境: fedora 12, kernel 2.6.31.5

在执行完 all , modules和modules_install后,

make all modules modules_install

可以使用安装kernel到boot了. 注意install过程需要mkinitrd这个package, 应当yum install安装先.

make install

在kernel脚本arch/x86/boot/Makefile中, 是这样定义install target的. 就是调用install.sh

install:
    sh $(srctree)/$(src)/install.sh $(KERNELRELEASE) $(obj)/bzImage \
       
        System.map "$(INSTALL_PATH)"

而arch/x86/boot/install.sh如下. 继而调用/sbin/installkernel

#!/bin/sh
#
# This file is subject to the terms and conditions of the GNU General Public
# License.  See the file "COPYING" in the main directory of this archive
# for more details.
#
# Copyright (C) 1995 by Linus Torvalds
#
# Adapted from code in arch/i386/boot/Makefile by H. Peter Anvin
#
# "make install" script for i386 architecture
#
# Arguments:
#   $1 - kernel version
#   $2 - kernel image file
#   $3 - kernel map file
#   $4 - default install path (blank if root directory)
#

verify () {
if [ ! -f "$1" ]; then
    
        echo ""                                                   1>&2
     echo " *** Missing file: $1"                              1>&2
     echo ' *** You need to run "make" before "make install".' 1>&2
     echo ""                                                   1>&2
     exit 1
fi
}

# Make sure the files actually exist
verify "$2"
verify "$3"

# User may have a custom install script

if [ -x ~/bin/${CROSS_COMPILE}installkernel ]; then exec ~/bin/${CROSS_COMPILE}installkernel "$@"; fi
if [ -x /sbin/${CROSS_COMPILE}installkernel ]; then exec /sbin/${CROSS_COMPILE}installkernel "$@"; fi

# Default install - same as make zlilo

if [ -f $4/vmlinuz ]; then
   mv $4/vmlinuz $4/vmlinuz.old
fi

if [ -f $4/System.map ]; then
    mv $4/System.map $4/System.old
fi

cat $2 > $4/vmlinuz
cp $3 $4/System.map

if [ -x /sbin/lilo ]; then
    /sbin/lilo
elif [ -x /etc/lilo/install ]; then
    /etc/lilo/install
else
    sync
    echo "Cannot find LILO."
fi

installkernel会将arch/x86/boot/bzImage拷贝到/boot/vmLinuz-$KERNEL_VERSION, 而arch/x86/boot/System.map拷贝到/boot/System.map-$KERNEL_VERSION. 并建立softlink.
随后installkernel会调用
    /sbin/new-kernel-pkg --mkinitrd --depmod --install $KERNEL_VERSION
    /sbin/new-kernel-pkg --rpmposttrans $KERNEL_VERSION
完成对grub的配置. new-kernel-pkg中使用的是grubby这个工具. 配置的内容体现在/boot/grub/grub.conf中. 我机器上的grub.conf内容

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/mapper/vg_zfkernel-lv_root
#          initrd /initrd-[generic-]version.img
#boot=/dev/sda
default=1
timeout=6
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Fedora (2.6.31.mykernel)
    root (hd0,0)
    kernel /vmlinuz-2.6.31.mykernel ro root=/dev/mapper/vg_zfkernel-lv_root  LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us rhgb quiet
    initrd /initrd-2.6.31.mykernel.img
title Fedora (2.6.31.5-127.fc12.i686.PAE)
    root (hd0,0)
    kernel /vmlinuz-2.6.31.5-127.fc12.i686.PAE ro root=/dev/mapper/vg_zfkernel-lv_root  LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us rhgb quiet
    initrd /initramfs-2.6.31.5-127.fc12.i686.PAE.img