2013-03-23 22:22:34 +01:00
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Documentation of RescueOS
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=========================
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RescueOS is a rescue solution for the Nokia N900, distributed
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as an initrd image. It has several features, most
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notable:
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mounting maemo /
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EMMC access(can mount maemo home and MyDocs partition)
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WiFi support
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USB mass-storage mode
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USB networking
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Battery charging
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Users must be familiar with the Linux console.
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This project is _NOT_ the meego rescue initrd.
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How does it work?
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~~~~~~~~~~~~~~~~~
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The flasher utility loads rescueOS. This makes it unnecessary
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2013-03-24 12:14:43 +01:00
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to modify the bootloader or maemo's /sbin/preinit like other solutions do.
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2013-03-23 22:22:34 +01:00
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By using the "-l" option, we do not flash the kernel or initrd image.
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It only loads the kernel into RAM. No modification on
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the NAND or bootloader happens.
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Usecases
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~~~~~~~~
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In fact, most users do not need it. Either way, possible usecases:
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-Changing typos in bootscripts which prevent an operation system
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(e.g. maemo) to boot.
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-Backuping files prior to a reflash.
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-Charging the battery (when maemo is dead).
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-Modification of the EMMC partitions and partition table.
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-Backup & Restoring maemo rootfs.
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-fsck file system checks
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-and more...
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Booting the initrd
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~~~~~~~~~~~~~~~
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2013-03-24 12:14:43 +01:00
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You can not store persistent data as everything happens in RAM.
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2013-03-23 22:22:34 +01:00
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flasher-3.5 -k 2.6.37 -n initrd.img -l -b"rootdelay root=/dev/ram0
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wait for "suitable device not found..." and connect the N900 to your
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Linux box through USB.
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~~~~~~~~~~~~~~~
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How to use it
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~~~~~~~~~~~~~~~
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It boots and you get a bash shell.
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The folder /rescueOS/ contains some scripts for various tasks. Not all of them
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are completed yet. They help you with the usual stuff, e.g. mass-storage
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mode, maemo root mounting, usbnetworking, WiFi setup etc.
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Mounting maemo root
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-------------------
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/rescueOS/mount-maemo-root.sh
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This scripts mounts the maemo root to /mnt/maemo.
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/rescueOS/umount-maemo-root.sh
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USB Networking
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-------------
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/rescueOS/usbnetworking-enable.sh
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Sets up USB networking in the following way:
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ifconfig usb0 192.168.2.15 up
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ifconfig usb0 netmask 255.255.255.0
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route add 192.168.2.14 usb0
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To disable it: /rescueOS/usbnetworking-disable.sh
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USB Mass-Storage mode
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--------------------
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/rescueOS/mass-storage-enable.sh
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2013-03-24 12:14:43 +01:00
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Makes the first 2 EMMC partitions available for the mass-storage
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mode. Known as /home/ and /home/user/MyDocs inside maemo.
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2013-03-23 22:22:34 +01:00
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/rescueOS/mass-storage-disable.sh: Deactivates mass-storage mode.
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WiFi support
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------------
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It has wpa_supplicant, but without EAP support. This should be ok for
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most home networks which use a PSK.
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Give the following a try:
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2013-03-24 12:14:43 +01:00
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wpa_passphrase [essid] [password] > /run/wlan.conf
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2013-03-23 22:22:34 +01:00
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sh /rescueOS/setup-wpa-wifi.sh
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2013-03-24 12:14:43 +01:00
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For DHCP:
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2013-03-23 22:22:34 +01:00
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2013-03-24 12:14:43 +01:00
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udhcpc -i wlan0.
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2013-03-23 22:22:34 +01:00
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Battery charging
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----------------
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By using ShadowJK's charge21 script. Use it only with the wallcharger,
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as it pulls 950 mA, and USB is not designed for that
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(some ports can do it though, don't try if in doubt.)
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/rescueOS/charge21.bash
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Shutdown
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--------
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poweroff
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Root password
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-------------
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rootme
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Contributions and suggestions are welcome. Write to me (NIN101 on freenode).
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