Introduction
The original FSG firmware has the following layout:
1) flash has four MTD partitions (
http://www.nslu2-linux.org/wiki/FSG3/FisList)
2) The HDD also has 4 partitions (first two are for root filesystem, third is swap partition and the fourth is for user data)
If you are using FSNA recovery procedure (
http://www.openfsg.com/index.php/Recovery_Procedure), the firmware switches kernel from
mtd1 to
mtd2 and root filesystem from
/dev/sda1 to
/dev/sda2 as it needs. For example, if you are upgrading from kernel 2.4 to kernel 2.6, new kernel will be written to different mtd partition. If you are just reflash firmware with the same kernel, most likely is that kernel will stay on the same
mtd partition and only HDD partition will be switched.
Compile OpenWRT firmware
This example asumes that you will use the original FSG partitions. Therefore you have to compile OpenWRT kernel with ReserFS support. Append
profile-FSG3 to the end of
config-default and add to the
config-default file following:
Code:
CONFIG_REISERFS_FS=y
CONFIG_REISERFS_PROC_INFO=y
In
make menuconfig select "Target images" and check "tgz". Save the result and build the firmware. You will need files:
openwrt-fsg3-2.6-zImage (linux kernel)
openwrt-ixp4xx-2.6-rootfs.tgz (root filesystem).
You will also need
microcode. There are two files in
build_dir/linux-ixp4xx direcory: NPE-B and NPE-C. To create needed microcode, from the shell go to build_dir/linux-ixp4xx directory and issue command:
Code:
cat NPE-B NPE-C > NPE-BC
The resulting file NPE-BC is the needed
microcode.
All installation is done from SSH (
http://www.openfsg.com/index.php/Use_the_SSH_Server).
Prepare flash layout1) Using Recovery procedure (
http://www.openfsg.com/index.php/Recovery_Procedure), flash latest firmware with kernel 2.6. This ensures that FSG uses
mtd1 partition for kernel and
/dev/sda1 as root filesystem.
2) We need
/dev/sda1 for OpenWRT root filesystem. Update the same original FSG firmware from web interface. This ensures that FSG will use
mtd1 partition for kernel but swithces the root filesystem to
/dev/sda2.
3) Install ipkg (
http://www.openfsg.com/index.php/Use_the_Custom_Ipkg_Installer)
4) Using
ipkg, install tools
fis and
fconfig.
5) Check that FSG really uses
mtd1 kernel and
/dev/sda2 as root filesystem:
Code:
fconfig -r -d /dev/mtd3 -n boot_script_data
The output should be someting like this:
Code:
fis load kern1
exec -c "console=ttyS0,115200 root=/dev/hda2 mem=64M@0x00000000"
The keywords are
kern1 and
/dev/hda2.
6) Backup current
mtd4 partition to file:
Code:
dd if=/dev/mtd4 of=mtd4.bin
7) Create new mtd partition for
NPE microcode:
Code:
fis -d mtd4.bin create microcode -f 0x503a0000 -l 0x20000
8) Erase the current content of the
mtd4 partition:
Code:
erase /dev/mtd4 0 1 1
9) Write the new content for
mtd4 partition:
Code:
dd if=mtd4.bin of=/dev/mtd4
10) Erase the current content of the
mtd2 partition:
Code:
erase /dev/mtd2 0 12 1
11) reboot the router
Install OpenWRT kernel1) check that you have
microcode partition:
Code:
cat /proc/mtd
2) using samba, copy OpenWRT files
openwrt-fsg3-2.6-zImage,
openwrt-ixp4xx-2.6-rootfs.tgz and
NPE-BC to the router.
3) from the shell go to the directory that contains copied data (/home/.users/admin).
4) erase the content of
microcode mtd partition:
Code:
erase /dev/mtd3 0 1 1
5) write
microcode to the flash:
Code:
dd if=NPE-BC of=/dev/mtd3
6) Backup FSG kernel from
mtd1 to
mtd2:
Code:
dd if=/dev/mtd1 of=/dev/mtd2
7) erase FSG kernel from flash:
Code:
erase /dev/mtd1 0 12 1
8) Write the OpenWRT kernel to the
mtd1:
Code:
dd if=openwrt-fsg3-2.6-zImage of=/dev/mtd1
Install OpenWRT root filesystem1) Login as
root (
http://www.openfsg.com/index.php/Logging_in_as_root)
2) Create a new directory in directory
/tmp:
Code:
mkdir /tmp/rootfs
3) Mount
/dev/sda1 to
/tmp/rootfs:
Code:
mount /dev/sda1 /tmp/rootfs
4) goto
/tmp/rootfs:
Code:
cd /tmp/rootfs
5) Remove the existing root filesystem:
Code:
rm -rf *
6) Install OpenWRT root filesystem:
Code:
tar zxvf /home/.users/admin/openwrt-ixp4xx-2.6-rootfs.tgz
Change Redboot config to load OpenWRT firmware1) Backup current
Redboot config:
Code:
dd if=/dev/mtd4 of=redboot.bin
2) Change
Redboot config to load OpenWRT kernel:
Code:
fconfig -w -d redboot.bin -n boot_script_data -x 'fis load kern1\exec -c "console=ttyS0,115200 root=/dev/sda1 init=/etc/preinit "\'
3) Change boot script timeout to ensure that HDD has spin up:
Code:
fconfig -w -d redboot.bin -n boot_script_timeout -x 5
4) Write new
Redboot config to the flash:
Code:
dd if=redboot.bin of=/dev/mtd4
5) reboot the router
The router should boot with OpenWRT.
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