Hardware Reference
In-Depth Information
■
A candidate time source is the next best time source that the system has configured. If the system was to
lose the primary time source it would select the next time source marked with a
+
in the list.
Note
Now that you have fixed the only error in the system's
dmesg
output, let's take a look around at the hardware a
little more. Next up I normally like to run:
# lspci
You will notice that you will get an error from this command rather than a listing of your PCI devices. That's
because the Raspberry Pi has no PCI bus; hence the
lspci
tool cannot find any information. How can you find out
what buses the Raspberry Pi has? That's quite simple with Linux: just do a directory listing on
/sys/bus/platform/
devices/
; as you can see in Figure
2-6
we have our I
2
C, SPI, and GPIO buses.
Figure 2-6.
Available buses on the Raspberry Pi
Last, I like to look at the USB bus with the following command:
# lsusb
You may not have this tool as part of your base install. I would suggest that you install it with:
# yum install usbutils -y
This tool will show you what downstream USB devices you may have connected. In my case in Figure
2-7
you can
see I have only one device connected. That is Device 004.
Figure 2-7.
USB bus on the Raspberry Pi
