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Difference between revisions of "ZipIt Adam HOWTO"

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This package provides an alternative to the [[OpenZipIt]] firmware for the [[ZipIt]] Wireless Messenger. Like [[OpenZipIt]] this firmware includes the [[Busy Box]] utilities as well as the Dropbear ssh client and server. Unlike [[OpenZipIt]] this firmware includes a web browser ([[ELinks]]), however, the [[OpenZipIt]] audio applications have been removed to conserve space. Some battery monitoring tools and various other useful utilities are also included. An additional feature of this firmware is that it is modular allowing modifications without the danger of a full re-flash.
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This package provides an alternative to the [[OpenZipIt]] firmware for the [[ZipIt]] Wireless Messenger. Like [[OpenZipIt]] this firmware includes the [[BusyBox]] utilities as well as the Dropbear ssh client and server. Unlike [[OpenZipIt]] this firmware includes a web browser ([[ELinks]]), however, the [[OpenZipIt]] audio applications have been removed to conserve space. Some battery monitoring tools and various other useful utilities are also included. An additional feature of this firmware is that it is modular allowing modifications without the danger of a full re-flash.
  
 
== Requirements ==
 
== Requirements ==
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If the [[ZipIt]] fails to boot hold down the lid closed button during boot. This will prevent <code>opt.cramfs</code> and <code>userprefs.cramfs</code> from being mounted and will drop you into a shell where you can repair things. The file <code>rootfs.gz</code> contains the minimal rescue filesystem that makes this possible even if you screw up the filesystems on the other partitions so you probably don't want to mess with it unless you know what you are doing.
 
If the [[ZipIt]] fails to boot hold down the lid closed button during boot. This will prevent <code>opt.cramfs</code> and <code>userprefs.cramfs</code> from being mounted and will drop you into a shell where you can repair things. The file <code>rootfs.gz</code> contains the minimal rescue filesystem that makes this possible even if you screw up the filesystems on the other partitions so you probably don't want to mess with it unless you know what you are doing.
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[[Category:Zipit]]

Latest revision as of 21:38, 17 May 2010

This package provides an alternative to the OpenZipIt firmware for the ZipIt Wireless Messenger. Like OpenZipIt this firmware includes the BusyBox utilities as well as the Dropbear ssh client and server. Unlike OpenZipIt this firmware includes a web browser (ELinks), however, the OpenZipIt audio applications have been removed to conserve space. Some battery monitoring tools and various other useful utilities are also included. An additional feature of this firmware is that it is modular allowing modifications without the danger of a full re-flash.

Requirements

Installation of this firmware requires a ZipIt that has been re-flashed with the BURN3 firmware and a NFS server accessible over a wireless network. Re-flashing with the BURN3 firmware makes it possible to boot the ZipIt to a command line, mount a NFS volume, copy files to the ZipIt, and re-flash the ZipIt. It is beyond the scope of this document to describe setting up an NFS server. If you are a Linux user consult the Linux NFS-HOWTO or the documentation provided by your distribution.

Server setup

Once your NFS server is functioning properly download Adam's Alternate ROM Load from http://www.mib.org/zip/TEST-ROOT/. Extract the files from the archive and copy them to a directory on the NFS server that will be accessible to the ZipIt. Depending on your network configuration you may need to change how the NFS volume is being shared. On Linux this is achieved by editing the /etc/exports file.

Firmware installation

All of the commands in this section are executed on the ZipIt. Although it is certainly possible to type them using the ZipIt's keyboard it may be preferable to connect to the ZipIt from a machine with a full-size keyboard, after network connectivity has been established. BURN3 includes a telnet server so executing


telnet zipit_ip_address


where zipit_ip_address is the ZipIt's IP address from a terminal will allow you to login to the ZipIt and execute commands as if you were typing them on its keyboard.

Establish network connectivity

The first step in the installation process is to connect the ZipIt to the network. If your access point does not use encryption, broadcasts its SSID, and uses DHCP connecting is as simple as issuing the command


udhcpc


For more complicated configurations involving an access point that uses WEP or does not broadcast its SSID it will be necessary to configure the ZipIt's wireless interface using iwconfig before running udhcpc. If your router does not use DHCP use ifconfig to specify the ZipIt's IP address manually.

Mount NFS volume

After successfully connecting the ZipIt to the network mount the NFS volume to a directory on the ZipIt. First create a mount point


mkdir /mnt/net1


Then mount the NFS volume


mount -t nfs -o nolock,tcp,intr server_ip_address:/server_folder /mnt/net1


replacing server_ip_address and server_folder with appropriate values for your configuration. Next copy all of the files included with Adam's Alternate ROM Load from the NFS volume to the ZipIt's /tmp directory

Create block devices

After copying files from the NFS volume create the two additional block devices that are utilized by Adam's Alternate ROM Load.


mknod /dev/mtdblock4 b 31 4
mknod /dev/mtdblock5 b 31 5


If all went well


ls -l /dev/mtdblock*


should produce something like:


brw-r----- 1 root root 31, 0 May 19 16:11 /dev/mtdblock0
brw-r----- 1 root root 31, 1 May 19 16:11 /dev/mtdblock1
brw-r----- 1 root root 31, 2 May 19 16:11 /dev/mtdblock2
brw-r----- 1 root root 31, 3 May 19 16:11 /dev/mtdblock3
brw-r----- 1 root root 31, 4 May 19 16:11 /dev/mtdblock4
brw-r----- 1 root root 31, 5 May 19 16:11 /dev/mtdblock5

Load modules

Before re-flashing it is necessary to load several modules that are used by the firmware. These modules are loaded with the commands:


 
cp -R /mnt/net1/* /tmp

insmod /tmp/modules/mtdcore.o
insmod /tmp/modules/mtdblock.o
insmod /tmp/modules/mtdpart.o
insmod /tmp/modules/chips/chipreg.o
insmod /tmp/modules/chips/gen_probe.o
insmod /tmp/modules/chips/cfi_probe.o
insmod /tmp/modules/chips/cfi_cmdset_0002.o
insmod /tmp/modules/maps/readwrite_rescue/danger_physmap.o

You are supposed to have the modules folder in the /tmp directory.

Re-flash

Finally it is time to copy the new filesystems to the block devices and re-flash. First copy the new filesystems to the appropriate block devices.


dd if=/tmp/rootfs.gz of=/dev/mtdblock3
dd if=/tmp/opt.cramfs of=/dev/mtdblock4
dd if=/tmp/userprefs.cramfs of=/dev/mtdblock5


Then execute


sync


to write all of the buffered filesystems to disk. Reboot the ZipIt and if everything went well you should be able to connect to the network using the steps described in the section "Establish network connectivity". In order to automatically connect to a network on boot refer to the section below on customization.

Customization

The multiple partitions used by this firmware make it relatively simple to make your own modifications. At a minimum you will probably want to modify the init scripts in userprefs.cramfs to automatically establish WiFi connectivity at boot. In order to make changes mount userprefs.cramfs to a temporary directory on your development machine. For example:


mkdir /tmp/userprefs
mount -t cramfs -o loop userprefs.cramfs /tmp/userprefs


Then copy the contents of the filesystem to a writable location.


mkdir /tmp/userprefs_modified
cp -a /tmp/userprefs/* /tmp/userprefs_modified/


After making changes to the files in /tmp/userprefs_modified/ make a new filesystem by executing.


mkcramfs /tmp/userprefs_modified /tmp/userprefs_modified.cramfs


Next make the new filesystem available on the NFS volume. Finally download the modified filesystem to the ZipIt, use dd to copy it to the appropriate block device, and sync as describe above. If you wish you can mount the block device that was modified to a temporary directory before syncing and rebooting in order to verify that everything is as it should be.

If the ZipIt fails to boot hold down the lid closed button during boot. This will prevent opt.cramfs and userprefs.cramfs from being mounted and will drop you into a shell where you can repair things. The file rootfs.gz contains the minimal rescue filesystem that makes this possible even if you screw up the filesystems on the other partitions so you probably don't want to mess with it unless you know what you are doing.