Craig 741e (any Allwinner) tablets - Booting Linux from SD | easy android recovery

Discussion in 'Craig Tablets' started by bongs, Jul 3, 2014.

  1. bongs

    bongs Junior Member

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    This may require rooting the tablet (mine was) but will allow you to:
    • Boot just about any linux image - recommended armhf for speed increase.
    • Recover android very easily once linux is booted on the tablet

    You will need a 4+GB SD card, USB mouse/keyboard, HDMI cable, HDMI monitor/tv for this to work.


    Booting Linux from SD card

    1. DD the linux image to your SD card.
    2. Write the mk802 bootloader to your SD card. (the regular MK802 device files are the only one that work for me; MK802II/MK802+/etc don't work.)
    3. Copy the mk802 script.bin to the first partition on the newly created SD card (the first 16MB partition).
    4. Plug in HDMI cable and USB keyboard/mouse.
    5. Insert SD card and restart the tablet by holding down power button; may have to hold power and Vol+ or Vol - for rebooting.
    6. The keyboard/mouse should turn on if this works (light on mouse turns on) and then your HDMI tv/monitor will show a black screen and/or penguin as it boots. If your USB device does not get power or the HDMI TV not find a signal, restart the tablet. This may take multiple times to get this to work.

    http://www.miniand.com/forums/forums/development/topics/debian-wheezy-lxde-armhf-build

    MK802 bootloader
    MK802 script.bin


    Other versions work great
    A: Downloads | cubiuntu (CB1 editions work (cubiebox))
    Aruntu 23-Jun-2014 CB1 0.777 Deep Blue Edition ----- Working GPU that will play 1080p content. Easiest to get working; based on ubuntu.

    B: http://www.miniand.com/forums/forums/development--3/topics/linaro-12-06-desktop


    The bad:
    1. The MK802 bootloader files give rock solid performance but I can't figure out how to access the full 1GB. Using anything else causes issues or won't boot.
    2. HDMI only so far.
    3. PITA to get the hang of booting the SD card. Takes a few tries as there are no indicator lights beyond the mouse/keyboard turning on.

    ____________________________

    Easy android recovery i.e. fix stuck android boot loop

    Once you boot into linux you can write directly to the nand for recovery.

    http://www.androidtablets.net/forum/craig-tablets/53726-cmp741e-complete-nandroid-backup-3.html
    Dev-Host - A10_FW_BACKUP_20130120_1154.zip - The Ultimate Free File Hosting / File Sharing Service

    /dev/nanda etc
    or
    /dev/nand1 etc

    cat /sdcard/bootloader.img > /dev/block/nanda

    cat /sdcard/boot.img > /dev/block/nandc

    You can also use the recovery.img if you want.

    Understanding which paritions to write to:
    Android/partitions - linux-sunxi.org


    ____________________________

    The above works fine for Allwinner A10 tablet. Should work with new versions of allwinner A20/A31. You just have to find the correct bootloader and script.bin. Pulling the script.bin from the android filesystem did NOT work for me.
     

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