225 Zeilen
6.8 KiB
Plaintext
225 Zeilen
6.8 KiB
Plaintext
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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Lock code reset
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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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to modify the bootloader or maemo's /sbin/preinit like other solutions do.
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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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Use cases
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~~~~~~~~~
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In fact, most users do not need it. Either way, possible use cases:
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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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-Creating a backup of files before starting 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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-Backing up & Restoring maemo rootfs.
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-fsck file system checks
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-Resetting the lock code (without reflashing)
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-and more...
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Booting rescueOS with flasher
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Note: You can not store persistent data in /. Of
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course, it becomes possible on the mount points you mount the EMMC or sd card
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to.
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Note: It comes without any promises and without any warranty. Therefore you
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are doing everything at your own risk.
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To load rescueOS onto an N900, you'll need a USB data cable, a PC, and one of
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the following flashers:
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- 0xFFFF - the Open Free Fiasco Firmware Flasher
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Free/open source, but only runs on GNU/Linux.
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Packaged for Ubuntu and Debian as '0xffff':
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http://packages.ubuntu.com/source/0xffff
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https://packages.debian.org/sid/0xffff
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Discussion: http://talk.maemo.org/showthread.php?t=87996
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Source repo: https://github.com/pali/0xFFFF
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- maemo_flasher v3.5 - the original proprietary flasher from Nokia
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Windows, MacOS, GNU/Linux
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Official distribution site is gone. Archive copies at:
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https://web.archive.org/web/20131117084237/http://skeiron.org/tablets-dev/maemo_dev_env_downloads/
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Documentation:
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http://wiki.maemo.org/Documentation/Maemo_5_Developer_Guide/Development_Environment/Maemo_Flasher-3.5
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Switch the N900 completely off. If it is plugged into a charger, a PC, or
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anything else by its USB port, unplug it and wait about 10 seconds to give the
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charger software time to shut down. Don't connect it to the PC just yet.
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Startup the flasher and get it ready to load rescueOS. For 0xFFFF, the
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incantation is:
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0xFFFF -m kernel:rescueOS_n900_kernel_1.3.zImage -m initfs:rescueOS-1.3.img -l -b 'rootdelay root=/dev/ram0'
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For maemo_flasher, it's:
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flasher-3.5 -k rescueOS_n900_kernel_1.3.zImage -n rescueOS-1.3.img -l -b"rootdelay root=/dev/ram0"
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You'll get a message like "suitable device not found...", but the flasher
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should block and wait. Now connect the N900 to the PC with the data cable; the
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flasher should detect the device, upload rescueOS, launch it, and then exit.
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Booting rescueOS with U-Boot from SD card
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Use this method if you have installed U-Boot (https://talk.maemo.org/showthread.php?t=81613)
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and battery is so depleted, that flashing doesn't work.
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You'll need "mkimage" command from "u-boot-tools" package.
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Preparing required files:
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mkimage -A arm -O linux -T kernel -C none -a 80008000 -e 80008000 -n kernel -d rescueOS_n900_kernel_1.3.zImage rescueOS_n900_kernel_1.3.uImage
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mkimage -A arm -O linux -T ramdisk -C none -a 0 -e 0 -n initrd -d rescueOS-1.3.img rescueOS-1.3.uimg
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cat >boot.cmd <<EOF
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setenv bootargs rootdelay root=/dev/ram0;
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setenv setup_omap_atag 1;
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setenv mmckernfile rescueOS_n900_kernel_1.3.uImage;
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setenv mmcinitrdfile rescueOS-1.3.uimg;
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setenv mmcscriptfile;
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run trymmckerninitrdboot;
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EOF
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mkimage -c none -A arm -T script -d boot.cmd boot.scr
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Preparing SD card:
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Your SD card needs to have the first partition formatted as ext2/3/4 or FAT.
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Put generated files (without boot.cmd) in the root directory.
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Now you should be able to boot rescueOS with generic "External SD card" option from U-Boot.
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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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Lock code reset
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---------------
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code_reset
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# This will set the lock code back to the default ('12345').
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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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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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/rescueOS/mass-storage-disable.sh: Deactivates mass-storage mode.
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Please unmount on your PC first.
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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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wpa_passphrase [essid] [password] > /run/wlan.conf
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sh /rescueOS/setup-wpa-wifi.sh
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For DHCP:
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udhcpc -i wlan0.
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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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Shortcuts
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---------
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The following shortcuts are available to avoid unnecessary typing on the N900
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keyboard.
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mmr -> mount maemo root
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ummr -> umount maemo root
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enftp -> enable ftp (anon upload/download everywhere)
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mse -> enable mass-storage mode
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msd -> disable mass-storage mode
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usbne -> enable usb networking
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usbnd -> disable usb networking
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chargebat -> start battery charging
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telnetd -> start telnetd. only necessary if you have closed it explicitly,
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since it starts on boot.
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Tab: Shift + Space
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ESC: Fn (Arrow) + Ctrl
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File transfer
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----------------------
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Enable the FTP server with "enftp".
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It will have anonymous up and download enabled everywhere.
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Then you can connect to it once USB networking or a WLAN connection
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has been established, using any FTP client. For downloads, most browsers
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can be used.
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Alternatively, use mass-storage mode.
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Contributions and suggestions are welcome. Write to me (NIN101 on freenode or TMO. E-Mail: n900-rescueOS at quitesimple period org).
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