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pi@raspberrypi:~ $ cat /boot/config.txt
# For more options and information see
# http://rpf.io/configtxt
# Some settings may impact device functionality. See link above for details
# uncomment if you get no picture on HDMI for a default “safe” mode
#hdmi_safe=1
# uncomment this if your display has a black border of unused pixels visible
# and your display can output without overscan
#disable_overscan=1
# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16
# uncomment to force a console size. By default it will be display’s size minus
# overscan.
#framebuffer_width=1280
#framebuffer_height=720
# uncomment if hdmi display is not detected and composite is being output
#hdmi_force_hotplug=1
# uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=1
#hdmi_mode=1
# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
#hdmi_drive=2
# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost=4
# uncomment for composite PAL
#sdtv_mode=2
#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800
# Uncomment some or all of these to enable the optional hardware interfaces
#dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on
# Uncomment this to enable the lirc-rpi module
#dtoverlay=lirc-rpi
# Additional overlays and parameters are documented /boot/overlays/README
# Enable audio (loads snd_bcm2835)
dtparam=audio=on
enable_uart=1
# Added by Joseph Grey
dtparam=i2c_arm=on
dtparam=i2c1=on
pi@raspberrypi:~ $ cat /boot/cmdline.txt
dwc_otg.lpm_enable=0 console=tty1 root=PARTUUID=db09dfc6-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles
pi@raspberrypi:~ $ cat /etc/default/gpsd
# Default settings for the gpsd init script and the hotplug wrapper.
# Start the gpsd daemon automatically at boot time
START_DAEMON=”true”
# Use USB hotplugging to add new USB devices automatically to the daemon
USBAUTO=”true”
# Devices gpsd should collect to at boot time.
# They need to be read/writeable, either by user gpsd or the group dialout.
DEVICES=”/dev/serial0″
# Other options you want to pass to gpsd
GPSD_OPTIONS=””
pi@raspberrypi:~ $ dmesg | grep tty
[ 0.000000] Kernel command line: 8250.nr_uarts=1 bcm2708_fb.fbwidth=800 bcm2708_fb.fbheight=480 bcm2708_fb.fbswap=1 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 dwc_otg.lpm_enable=0 console=tty1 root=PARTUUID=db09dfc6-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles
[ 0.000284] console [tty1] enabled
[ 0.670448] 3f201000.serial: ttyAMA0 at MMIO 0x3f201000 (irq = 87, base_baud = 0) is a PL011 rev2
[ 0.672007] 3f215040.serial: ttyS0 at MMIO 0x0 (irq = 166, base_baud = 31250000) is a 16550
pi@raspberrypi:~ $ ls -l /dev/serial*
lrwxrwxrwx 1 root root 5 May 22 20:15 /dev/serial0 -> ttyS0
lrwxrwxrwx 1 root root 7 May 22 20:15 /dev/serial1 -> ttyAMA0
pi@raspberrypi:~ $ ls -l /deve/i2c*
ls: cannot access ‘/deve/i2c*’: No such file or directory
pi@raspberrypi:~ $ ls -l /dev/i2c*
crw-rw—- 1 root i2c 89, 1 May 22 20:15 /dev/i2c-1
pi@raspberrypi:~ $ cat /etc/modules
# /etc/modules: kernel modules to load at boot time.
#
# This file contains the names of kernel modules that should be loaded
# at boot time, one per line. Lines beginning with “#” are ignored.
i2c-dev
i2c-bcm2708
pi@raspberrypi:~ $ ps ax | grep gpsd
22090 ? S<s 0:00 /usr/sbin/gpsd -N /dev/serial0
29642 pts/0 S+ 0:00 grep –color=auto gpsd
pi@raspberrypi:~ $ gpsmon -r
gpsmon: invalid option — ‘r’
usage: gpsmon [-?hVn] [-l logfile] [-D debuglevel] [-t type] [server[:port:[device]]]
pi@raspberrypi:~ $