AlientSoftwareEngineer: 08/25/10

P1. patch kernek to support the squashfs plus lzma
P2. Must Use Same squashfs-tools version else still will got exeception. (example : use squashfs3.4.tar.gz
        to do patch kernel ,but using OpenWrt squashfs-tools () ,this will
        cause  exeception   "WARNING: at fs/squashfs/uncomp.c:136 sqlzma_un().....sb_bread failed
        reading block 0x1f4b" ) .

   ------------------ STEP BY STEP ----------------------
    for the kernel 2.6.22 as example:
1. put 3 patch file into floder near your Kernel Source path.
     3 files is (1) lzma457.tar.bz2
                  (2) squashfs3.4.tar.gz
                  (3) sqlzma3.4-457.tar.bz2
                   you can find these files on http://www.squashfs-lzma.org/ left side .


2. Extract the sqlzma3.4-457.tar.bz2 , find the build.sample , rename it as sqlzma.sh
follow is my modify to fit my make system .

#!/bin/bash

#
# LZMA support for SquashFS 3.4 in kernel 2.6.27.4
#
# How to use this script:
# download all required files, copy them to current directory, run this script
# it will unpack kernel sources and other archives, and will make .ko modules
# as well as mksquashfs and unsquashfs binaries

export BUILD=bin
#export KERNELPATH=../kernel-linux_2.6.22.19-4.05.0
export KERNELPATH=$LINUX_KERNEL_SOURCE
echo "sqlzma shellscript detect LINUX PATH="$LINUX_KERNEL_SOURCE

if [ ! -f squashfs3.4.tar.gz -o ! -f lzma457.tar.bz2 -o ! -f sqlzma3.4-457.tar.bz2 ]; then
echo "missing required file"
exit
fi

rm -rf squashfs3.4 lzma457

tar xjf sqlzma3.4-457.tar.bz2
tar xzf squashfs3.4.tar.gz
# tar xjf linux-2.6.27.4.tar.bz2
mkdir lzma457
tar -C lzma457 -xjf lzma457.tar.bz2

#Jacky.Xue:I have do follow kernel squashfs patch already
#patch -d $KERNELPATH -p1 < squashfs3.4/kernel-patches/linux-2.6.22/squashfs3.4-patch
patch -N -d $KERNELPATH -p1 < sqlzma2k-3.4.patch
patch -N -d squashfs3.4 -p1 < sqlzma2u-3.4.patch
patch -N -d lzma457 -p1 < sqlzma1-457.patch

ln -s ../../$KERNELPATH squashfs3.4/kernel-patches

echo "cp .config $KERNELPATH"
echo "cd $KERNELPATH"
echo "make oldconfig"
echo "make prepare"
echo "make scripts"
echo "cd -"

echo "initialize kernel sources now, by using the commands mentioned above"
echo "and then press ENTER..."
#read

make

mkdir -p $BUILD
cp ./$KERNELPATH/fs/squashfs/squashfs.ko $BUILD
cp ./lzma457/C/Compress/Lzma/kmod/sqlzma.ko $BUILD
cp ./lzma457/C/Compress/Lzma/kmod/unlzma.ko $BUILD
cp ./squashfs3.4/squashfs-tools/unsquashfs $BUILD
cp ./squashfs3.4/squashfs-tools/mksquashfs $BUILD
strip --strip-unneeded $BUILD/mksquashfs $BUILD/unsquashfs

      3. after success run the script on step 2.
           you will get the tools (to generate the squashfs lzma rootfile system )
           mksquashfs
           unsquashfs
           the mksquashfs example :
           mksquashfs    ROOTFS_PATH    IMAGE_NAME -noappend
           also will get 2 ko (kernel modules)
           sqlzma.ko and unlzma.ko
           IF you don't want use kernel module to support squashfs-lzma ,the try step 4.

      4. Modify to support kernel build-in ,
        (1) modify YOUR kernelsource/fs/squashfs/Makefile
          #

         # Makefile for the linux squashfs routines.
          #
          # the environment variables are not inherited since 2.6.23
           ifdef SQLZMA_EXTRA_CFLAGS
           EXTRA_CFLAGS += ${SQLZMA_EXTRA_CFLAGS}
           endif

           obj-$(CONFIG_SQUASHFS) += unlzma.o sqlzma.o squashfs.o
           unlzma-y += module.o
           sqlzma-y += uncomp.o
           squashfs-y += inode.o
           squashfs-y += squashfs2_0.o

          (2) Makesure your kernelsource/fs/squashfs/   path have follow source files:
          inode.c
          uncomp.c
          module.c
          sqlzma.h
          sqmagic.h
          LzmaDecode.c
          LzmaDecode.h
          LzmaTypes.h
          squashfs2_0.c
          squashfs.h

              the module.c include the LzmaDecode.c file path should be change
             from
             #include "../LzmaDecode.c"
               to
              #include "LzmaDecode.c"

           (3) rebuild your kernel (note i suupose that you have know how to add CONFIG_SQUASHFS in
                 your kernel default config)
            CC fs/ramfs/inode.o

CC fs/ramfs/file-mmu.o
LD fs/ramfs/ramfs.o
LD fs/ramfs/built-in.o
CC fs/squashfs/uncomp.o
CC fs/squashfs/inode.o
CC fs/squashfs/squashfs2_0.o
CC fs/squashfs/module.o
LD fs/squashfs/unlzma.o
LD fs/squashfs/sqlzma.o
LD fs/squashfs/squashfs.o
LD fs/squashfs/built-in.o
CC fs/sysfs/inode.o
CC fs/sysfs/file.o

                              Ok ~ done!

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Patch Kernel to Support Squashfs-Lzma (Today finished this job and test success)

Kernel Patch -Example

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