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.