What this is: A fastboot executable binary for using the fastboot protocol to control other devices which supports fastboot, like the Galaxy Nexus or other Nexus-phones.
What this isn't: Fastboot bootloader-support for the transformer.
What this doesn't come with: Any sort of warranties. You take this as is. If your fastboot-capable device explodes when using it, I take no responsibility.
With that said:
This is a seemingly fully functional fastboot binary, so that you can mod your Nexus phone from the transformer (you did know it ships with adb out of the box, right? )
To use it simply open a console and root up:
$ su #
# adb kill-server # adb start-server
# adb devices -- your device here # adb reboot bootloader
# fastbootarm devices -- voila. your device here. mod along # fastbootarm boot recovery-mylittlepony.img -- etc
Fastboot arm is attached to this post. Download, unpack and copy to your transformer:
$ adb devices -- your transformer here $ adb push fastbootarm /sdcard/ $ adb shell android$ su # mount -o remount,rw /system # cp /sdcard/fastbootarm /system/xbin/ # chmod 755 /system/xbin/fastbootarm # mount -o remount,ro /system # exit android$ exit $