Since my
main purpose was to use the Toshiba AC100 for screening 1080p HD movies at 6 Mbps or more, I did not do too many benchmarks or other tests. But the installation procedure was as follows.
This link provided tips on taking a backup of the factory boot-loader. Since I run Kubuntu as a dual boot on my laptop, I could install nvflash as
given here, with dpkg.
After installing nvflash,
whereis nvflash gave the location
/usr/lib/nvflash for
fastboot.bin which was the included bootloader. So, the command I used for backup of the Toshiba's bootloader was
nvflash --bl /usr/lib/nvflash/fastboot.bin --read 6 partition_6_backup.bin --go
When I tried it the first time, I had got the path wrong, a typo. After retyping the correct path, it took a very long time, and didn't seem to be doing anything. Just for testing out, tried putting off the device, and again putting it in recovery mode with Ctrl-Esc pressed down while power on. Then tried
nvflash --bl /usr/lib/nvflash/fastboot.bin --go
nvflash -r --getpartitiontable partitiontable.txt
nvflash -r --read 2 part-2.img
etc
as suggested at
http://gitorious.org/ac100/pages/Installation , worked in seconds. So, made a backup of partition 6 as given above.
Then followed the instructions at
https://wiki.edubuntu.org/ARM/TEGRA/AC100 for the install.
The system was fairly OK with Ubuntu 11.10, though a bit sluggish with its 512 MB RAM. Firefox opened in 10 seconds. Boot time was around a minute. xubuntu loaded with apt-get, and with an xfce desktop, it felt more responsive.
Anyway, since the video was not playing without frame-drops, went back to Android by restoring the boot loader,
nvflash --wait --bl /usr/lib/nvflash/fastboot.bin --download 6 partition_6_backup.bin --go