Instructions to install a10Core to sdcard, first boot and inital setup.

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Step 1. Go to  http://tinycorelinux.net/ports.html and download the "A10 Core Latest Build"
(usually a10Core.img.gz) and duplicate (do not simply copy!) the image to sdcard.  
Typically, using linux, type:

zcat a10Core.img.gz | dd of=/dev/sdd bs=1M

Careful to use the proper device for dd. You will wipe out the target device.

(NOTE: For the Hackberry board and possibly other devices: get the boot files specific to your  device...sunxi-spl.bin and u-boot.bin...and dd them to the card. These files can be found by searching the Miniand.com (or other vendor) forum.  

Swap out the script.bin file if necessary.
Script.bin files for several devices are available on the http://tinycorelinux.net/ports page.)

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Step 2. Use gparted, fdisk, or sfdisk to add a swap and regular linux partitions to fill up the remaining sd card. Swap is not absolutely necessary, but may be helpful for some users.  Be sure to mkswap and format respectively.
Note: That uboot uses the first part of disk so be extremely careful when selecting starting cylinder numbers. 

You may wish to use a pendrive for your collection of extensions and backup. If you do so you will need to use a waitusb option. Even some sdcards may need a waitusb option.
To update the boot codes, simply edit the text file uEnv.txt  This file should be on the same device partition as uCore.  If using an sdcard it should be found on mmcblk0p1

mount /mnt/mmcblk0p1
vi /mnt/mmcblk0p1/uEnv.txt

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Step 3. On your Allwinner device, insert sd card and apply power. Core boots very quickly to the $ prompt.

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Step 4. You need to setup your tce directory to store downloaded and imported extensions. 
At the $ prompt type:

tce-setdrive

You should then select by number the partiton that you setup to hold extensions 
from Step 2. If you do not see the expected partition then use updbootcodes to
add waitusb option and reboot to try again. To reboot type:

sudo reboot

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Step 5. Check that you network is up and that you have an IP number, type ifconfig to verify.  If you only have wireless access then see the README-wifi.txt

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Step 6. From CLI, the $ prompt, to backup simply type

backup

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Step 7. To shutdown from CLI type

sudo poweroff