Pack the custom firmware

From Eminent Opensource

Jump to: navigation, search

Contents

Introduction

Packing the firmware is just the reverse process of unpacking a firmware. Follow the description on this page.

Input

The changed firmware is not located in /home/user/EM7075/unpacked/2.00.13-custom, which contains:

  1. bin: directory with the directories and files in which you have made modifications
  2. em7075.bin: part of the official firmware, after extraction you had the bin directory
  3. em7075.fff: the kernel
  4. em7075.ver: a file containing some meta-data

Strip

Use the strip script to decrease size of all binaries.

Pack the custom firmware

First, increase the version number in em7075.ver: 

VERSION='2.00.13-custom'
LOCATION='em7075.bin'
KERNEL='Yes'
PKG_LOCATION='em7075.pkg'

Second, set the build-date (format: yyyy.mm.dd-hhmm) in /home/user/EM7075/unpacked/2.00.13-custom/bin/sysconfig: 

export SYSCONF_BUILD_DATE=2011.01.26-2004
export SYSCONF_FIRMWARE_BIN=em7075.bin
export SYSCONF_FIRMWARE_VER=em7075.ver
export SYSCONF_BOOTLOADER_MTD_PARTITION=/dev/sigmblocka
export SYSCONF_KERNEL_MTD_PARTITION=/dev/sigmblockd
export SYSCONF_FIRMWARE_MTD_PARTITION=/dev/sigmblockh
export SYSCONF_FIRMWARE_MTD_SIZE=31195136
export IS_DTS=n
export IS_DTCP=n

Make sure that this build date is more recent than the build date of your currently running firmware.

Third, you must update /home/user/EM7075/unpacked/2.00.13-custom/bin/md5sum.txt. This file contains a list of all files within the bin directory and their md5sum. This md5sum is used by the device to verify that all files have been copied correctly to the storage within the device. If the md5sum is incorrect, firmware upgrade will fail. 

cd /home/user/EM7075/unpacked/2.00.13-custom/bin/
rm -f md5sum.txt
find  -not -name "md5sum.txt" -type f -exec md5sum '{}' ';' > md5sum.txt

Finally, pack everything to new files. 

mkdir /home/user/EM7075/packed
mkdir /home/user/EM7075/packed/2.00.13-custom
cp /home/user/EM7075/unpacked/2.00.13-custom/em7075.ver /home/user/EM7075/packed/2.00.13-custom/em7075.ver
cp /home/user/EM7075/unpacked/2.00.13-custom/em7075.fff /home/user/EM7075/packed/2.00.13-custom/em7075.fff
/home/user/EM7075/cramfs-1.1/mkcramfs /home/user/EM7075/unpacked/2.00.13-custom/bin /home/user/EM7075/packed/2.00.13-custom/em7075.img
md5sum /home/user/EM7075/packed/2.00.13-custom/em7075.img> /home/user/EM7075/packed/2.00.13-custom/em7075.sum
dd if=/home/user/EM7075/packed/2.00.13-custom/em7075.sum of=/home/user/EM7075/packed/2.00.13-custom/em7075.bin bs=32 count=1
cat /home/user/EM7075/packed/2.00.13-custom/em7075.img >> /home/user/EM7075/packed/2.00.13-custom/em7075.bin
rm /home/user/EM7075/packed/2.00.13-custom/em7075.sum /home/user/EM7075/packed/2.00.13-custom/em7075.img

Output

Now you have a firmware ready for installing on the device located in /home/user/EM7075/packed/2.00.13-custom/. The directory contains:

  1. em7075.bin: files and directories you have modified in the bin directory
  2. em7075.fff: the kernel
  3. em7075.ver: a file containing some fresh meta-data

Automate it again

The pack.sh script helps you in packing a firmware. 

touch /home/user/EM7075/pack.sh
chmod +x /home/user/EM7075/pack.sh

And put the following lines in pack.sh: 

#!/bin/sh

# Strip the new firmware
/home/user/EM7075/strip.sh $1

# First: Adjust em7075.ver
echo "VERSION='$1'" > /home/user/EM7075/unpacked/$1/em7075.ver
echo "LOCATION='em7075.bin'" >> /home/user/EM7075/unpacked/$1/em7075.ver
echo "KERNEL='Yes'" >> /home/user/EM7075/unpacked/$1/em7075.ver
echo "PKG_LOCATION='em7075.pkg'" >> /home/user/EM7075/unpacked/$1/em7075.ver

# Second: Adjust syconfig
echo "export SYSCONF_BUILD_DATE="`date +%Y.%m.%d-%H%M` > /home/user/EM7075/unpacked/$1/bin/sysconfig
echo "export SYSCONF_FIRMWARE_BIN=em7075.bin" >> /home/user/EM7075/unpacked/$1/bin/sysconfig
echo "export SYSCONF_FIRMWARE_VER=em7075.ver" >> /home/user/EM7075/unpacked/$1/bin/sysconfig
echo "export SYSCONF_BOOTLOADER_MTD_PARTITION=/dev/sigmblocka" >> /home/user/EM7075/unpacked/$1/bin/sysconfig
echo "export SYSCONF_KERNEL_MTD_PARTITION=/dev/sigmblockd" >> /home/user/EM7075/unpacked/$1/bin/sysconfig
echo "export SYSCONF_FIRMWARE_MTD_PARTITION=/dev/sigmblockh" >> /home/user/EM7075/unpacked/$1/bin/sysconfig
echo "export SYSCONF_FIRMWARE_MTD_SIZE=31195136" >> /home/user/EM7075/unpacked/$1/bin/sysconfig
echo "export IS_DTS=n" >> /home/user/EM7075/unpacked/$1/bin/sysconfig
echo "export IS_DTCP=n" >> /home/user/EM7075/unpacked/$1/bin/sysconfig

# Third: update md5sum.txt
cd /home/user/EM7075/unpacked/$1/bin
rm -f md5sum.txt
find -not -name "md5sum.txt" -type f -exec md5sum '{}' ';' > md5sum.txt 

# Finally: pack
rm -r /home/user/EM7075/packed/$1
mkdir -p /home/user/EM7075/packed/$1
cp /home/user/EM7075/unpacked/$1/em7075.ver /home/user/EM7075/packed/$1/em7075.ver
cp /home/user/EM7075/unpacked/$1/em7075.fff /home/user/EM7075/packed/$1/em7075.fff
/home/user/EM7075/cramfs-1.1/mkcramfs /home/user/EM7075/unpacked/$1/bin /home/user/EM7075/packed/$1/em7075.img
md5sum /home/user/EM7075/packed/$1/em7075.img> /home/user/EM7075/packed/$1/em7075.sum
dd if=/home/user/EM7075/packed/$1/em7075.sum of=/home/user/EM7075/packed/$1/em7075.bin bs=32 count=1
cat /home/user/EM7075/packed/$1/em7075.img >> /home/user/EM7075/packed/$1/em7075.bin
rm /home/user/EM7075/packed/$1/em7075.sum /home/user/EM7075/packed/$1/em7075.img

And run it: 

/home/user/EM7075/pack.sh 2.00.13-custom
Retrieved from "http://opensource.eminent-online.com/wiki/index.php/Pack_the_custom_firmware"
Personal tools