btw vogt your error is just that: in the bootscript you dont load the initrd, so you just have to modify the bootscrip with a text editor and add the initrd

? It works fine, I don't need an initrd! My kernel doesn't support it!

How much time does it take to render a frame? Is it just too slow for real-time rotation?

45 sec - 1 Minute without overclocking :-(

At first I thought the video was fake or misleading or that teachers hating to see calcs being used for stuff other than math ran into just that video, but then watched it and it was legit.

Yeah, maybe I should have shown my complete setup..

Some might think it is fake, others might think that there is a typo in Linucx.

That would be  .. I know some who wouldn't understand it..

You should try compiling gnuplot.

Although you can get a better performance with the built-in from TI, here you go:
http://imgur.com/a/TlFSf

Here's a snapshot of both files (zImage.tns and rootfs.tar.bz2 (smaller and tar)):
http://ritter-vogt.dyndns.biz/lowlevel/rootfs.tar.bz2 (29 MiB)
http://ritter-vogt.dyndns.biz/lowlevel/zImage.tns (2 MiB)
If your firewall blocks dyndns, I'll upload it to dropbox.
Use `tar -xvf rootfs.tar.bz2 -C <mountpoint of usb-stick>`!
Then, if you don't want to wait at boottime, you can rename everything within /etc/init.d (e.g. `mv S85tinyhttpd tinyhttpd`).

Contents of rootfs.tar:
modular x.org (Needs some time to start)
links
Some directfb tests and examples
dhcp client (Preconfigured for eth0)
ethtool
wget (not tested)
blackbox window manager (runs perfectly, to run it create /etc/X11/xinit/xinitrc)
xterm, xcalc, xclock, twm
gnuplot (warning: slow as hell!; you have to `export GNUPLOT_DRIVER_DIR=/bin` first; I was to lazy to search, I symlinked )
mplayer (not tested)
fbv picture viewer
e2fsprogs (not tested)
ntfs3g (not tested)
fdisk (not tested)
hdparm (128 KiB/s read from USB :-/ )
minicom (not tested)
iw, wpa_supplicant, wireless tools (not tested, needs own kernel to be built)
tinyhttpd, openssh
bash
rsyslog
Not working "reset" cmd
nano
vim (not tested)
No locale support (but keyboard layouts)
Crysis

Of course you can also use debian or openSUSE armv5.

Kernel:
devtmpfs support
cdc_ether for networking
Swap support
Framebuffer with a dirty hack you don't wanna see (but it works and it didn't destroy my calc)
USB HID support
Sunplus Wireless Desktop support
No support for modules
No Initrd support (as it'd be useless without modules)

If you boot from USB, you don't need an initrd, as there don't exists any modules needed to mount USB.
The zImage contains the kernel, without it it'd be useless.

nothing happens....

Does really nothing happen?
I think there should be some usb-device-messages.
Try to plug your stick in after you can see the "waiting for root device"-message.

BTW: Don't use /dev/sdb1. The kernel waits for /dev/sdb (WITHOUT any partitions on it, only a plain filesystem).
But if you cant see any messages, we have some other problems.

I cant't get directfb to work. It says "current mode not supported".
I can see the current mode with "fbset -i" and filled /etc/fb.modes with "fbset >> /etc/fb.modes" but it still can't find any suitable modes.

Hi,
I downloaded the lates snapshot and it worked perfectly for me, but my USB Keyboard (2,4 GHz Dongle) won't get accepted as a keyboard.
How can I compile your kernel to add the missing driver?
If I clone you linux-git-tree, configure it with the obvious settings for nspire it can't find any USB-Devices ("doesn't acceppt address").
Could it be I forgot to disable High Speed? But I couldn't find anything.

With my custom rootfs I can get X running .. a bit. The screen slowly goes brighter until it's completely white but the console still stays active in the background.
If I type "reboot\n" it works.
I haven't tested swap but gcc works fine without it.

Edit: If I use your config (through /proc/config.gz) it still can't find any usb-devices.
Edit2: It seems I'm hitting a buildroot issue with X: http://lists.busybox.net/pipermail/buildroot/2012-September/058504.html

Thanks for your Linux port