When I first listened to Jacob “@ioerror” Applebaum talk from the 30c3 conference in Berlin I was impressed with the number and variety of different tools the NSA was using to monitor and spy on everything. One tool I was especially interested in being an iOS user was DROPOUTJEEP, sold as allowing full access with a 100% success rate in attacking iPhones but only with physical access.
The u-boot suite of tools has a very handy tool allowing you to work with the u-boot environment from Linux user space. There are two complications with this on the Allwinner SoCs, first the version of the u-boot tools that Debian ships don’t support the mmc card.
Assuming you have followed the last post you should now have a directory with a Debian armhf root filesystem in. The next stage is to build a bootable SD card image to actually boot your Cubietruck from.
There are lots of filesystems images for various Debian flavours on ARM developer boards like the Cubietruck floating about. Most of these images are large binary files of unknown providence and even compressed take a while to download. There is a better way of making a root image for your new ARM board, just build it on your own normal workstation directly from the Debian repos with debootstrap using the magic of QEMU.