TS-4900 Android Getting started
Android must be run from the eMMC. This can be written with the USB production tool, or from the SD card. To use the USB drive, follow the instructions here, and download the image and copy it to the USB drive as emmcimage.dd.bz2.
Download the Android image here:
To load from the SD card, boot up to any Linux distribution from the SD card such as the default Yocto. Once booted here, run:
wget -qO- ftp://ftp.embeddedarm.com/ts-arm-sbc/ts-7990-linux\ /distributions/android/android-7.1.1-tsimx6-tiwifi-\ latest.dd.bz2 | bzcat | dd bs=4M of=/dev/mmcblk2 conv=fsync
This will download it, decompress it, and write it to the eMMC drive. Reboot and boot into Android.