Hardware Reference
In-Depth Information
TIP
The /boot/uEnv.txt file contains a number of configuration commands that are executed at
boot time. The # character is used to add comments; that is, everything to the right of a # is
ignored by the Bone and is assumed to be for humans to read. In the previous example,
##Disable HDMI is a comment that informs us the next line(s) are for disabling the
HDMI. Two cape.disable commands follow. The first one is commented-out and won't
be executed by the Bone.
Why not just remove the first cape.disable ? Later, you might decide you need more
general-purpose input/output (GPIO) pins and don't need the HDMI display. If so, just re-
move the # from for first cape.disble . If you had completely removed the line earlier,
you would have to look up the details somewhere to re-create it.
When in doubt, comment-out; don't delete.
NOTE
If you want to re-enable the HDMI audio, just comment-out the line you added.
The Bone has only one USB port, so you will need to get either a keyboard with a USB
hub (see “Miscellaneous” ) or a powered USB hub. Plug the USB hub into the Bone and
then plug your keyboard and mouse in to the hub. You now have a Beagle workstation; no
host computer is needed.
TIP
The powered hub is recommended because USB can supply only 500 mA, and you'll want to
plug many things into the Bone.
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