beaglebone-black - Flipbook - Page 22
BeagleBone Black
While the four user LEDs can be overwritten and used as desired, they do have speci昀椀c meanings in the image
that is shipped with the board once the Linux kernel has booted.
• USER0 is the heartbeat indicator from the Linux kernel.
• USER1 turns on when the microSD card is being accessed
• USER2 is an activity indicator. It turns on when the kernel is not in the idle loop.
• USER3 turns on when the onboard eMMC is being accessed.
8. A Booted System
a. The board will have a mouse pointer appear on the screen as it enters the Linux boot step. You may
have to move the physical mouse to get the mouse pointer to appear. The system can come up in
the suspend mode with the HDMI port in a sleep mode.
b. After a minute or two a login screen will appear. You do not have to do anything at this point.
c. After a minute or two the desktop will appear. It should be similar to the one shown in 昀椀gure-1.
HOWEVER, it will change from one release to the next, so do not expect your system to look exactly
like the one in the 昀椀gure, but it will be very similar.
d. And at this point you are ready to go! 昀椀gure-16 shows the desktop after booting.
Fig. 3.16: Desktop Screen
9. Powering Down
A. Press the power button momentarily.
B. The system will power down automatically.
C. Remove the power jack.
3.2. Main Connection Scenarios
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