View source for iMX6 TinyRex Pro Accessing and Testing Peripherals

[[Category:iMX6 TinyRex Development kit]]
[[Category:iMX6 TinyRex pro]]
[[Category:iMX6 TinyRex Peripherals]]
<!-- -->
<div style="float:right">__TOC__</div>

Elemental operations of iMX6 TinyRex Development kit interfaces in pro configuration are shown on this page. For more specified information such as HDMI Input port or Wireless oprions, refer to the dedicated [[iMX6 TinyRex pro#Peripherals|Peripherals section]].

== Prerequisites ==
=== Hardware ===
* DC power supply (5V, 2A)
* iMX6 TinyRex Module pro
* iMX6 TinyRex Baseboard

=== Peripherals and Accessories ===
* 1x FullHD monitor with Audio output
* 1x HDMI signal generator (such as PC with HDMI interface or GoPro camera) 
* 1x MicroSD card
* 1x MiniPCIe WiFi card
* 1x RPi camera module
* 1x SATA HDD drive
* 2x USB FLASH drive

=== Cables ===
* Ethernet cable
* HDMI cable
* Micro HDMI cable
* Micro USB cable
* USB to UART cable

== User button ==
'''''Input:''''' Press the USER button<br />
'''''Output:''''' Button events 1 and 0 are generated
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# evtest /dev/input/by-path/platform-gpio-keys*-event
Input driver version is 1.0.1
Input device ID: bus 0x19 vendor 0x1 product 0x1 version 0x100pio-keys.16-event .
Input device name: "gpio-keys.16"
Supported events:
  Event type 0 (EV_SYN)
  Event type 1 (EV_KEY)
    Event code 116 (KEY_POWER)
Properties:
Testing ... (interrupt to exit)
Event: time 1453240251.571826, type 1 (EV_KEY), code 116 (KEY_POWER), value 1
Event: time 1453240251.571826, -------------- EV_SYN ------------
Event: time 1453240251.711820, type 1 (EV_KEY), code 116 (KEY_POWER), value 0
Event: time 1453240251.711820, -------------- EV_SYN ------------
</syntaxhighlight>

=== Alternative test ===
'''''Input:''''' Press the USER button<br />
'''''Output:''''' Button events 1 and 0 are generated
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# hexdump -C /dev/input/event0 
00000000  18 f4 d1 56 47 40 09 00  01 00 74 00 01 00 00 00  |...VG@....t.....|
00000010  18 f4 d1 56 47 40 09 00  00 00 00 00 00 00 00 00  |...VG@..........|
00000020  18 f4 d1 56 17 15 0b 00  01 00 74 00 00 00 00 00  |...V......t.....|
00000030  18 f4 d1 56 17 15 0b 00  00 00 00 00 00 00 00 00  |...V............|
</syntaxhighlight>

== Reset button ==
'''''Input:''''' Press the RESET button<br />
'''''Output:''''' Module will execute bootloader immediately with "Reset cause: POR"<br />
'''''Note:''''' Module should never freeze or hang after the reset button was pressed. Testing the operation 10 times gives a reliable result
<syntaxhighlight lang="bash">
U-Boot 2014.10 (Jan 19 2016 - 20:37:48)

CPU:   Freescale i.MX6SOLO rev1.1 at 792 MHz
Reset cause: POR
Board: MX6 TinyRex - pro
I2C:   ready
DRAM:  512 MiB
MMC:   FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2
*** Warning - bad CRC, using default environment

In:    serial
Out:   serial
Err:   serial
Net:   FEC [PRIME]
Hit any key to stop autoboot:  0 
</syntaxhighlight>

== CAN ==
'''''Input:''''' None<br />
'''''Output:''''' Device driver is available

<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# ip addr show dev can0
2: can0: <NOARP,ECHO> mtu 16 qdisc noop state DOWN group default qlen 10
    link/can
</syntaxhighlight><br/>

'''''Input:''''' Connect a pair of iMX6 TinyRex Development boards and a couple of dedicated [https://www.ti.com/tool/TCAN332EVM CAN evaluation modules]<br />
'''''Output:'''''  Boards communicate between each other. Sent messages are received successfully<br /><br />

Board 1 (receiver) commands and outputs:
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# ip link set can0 type can bitrate 1000000
root@imx6-tinyrexpro:~# ip link set can0 up
flexcan 2090000.flexcan can0: writing ctrl=0x01232054
root@imx6-tinyrexpro:~# candump can0 &
[1] 833
root@imx6-tinyrexpro:~#   can0  123   [4]  DE AD BE EF
</syntaxhighlight>

Board 2 (transmitter and receiver) commands and outputs:
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# ip link set can0 type can bitrate 1000000
root@imx6-tinyrexpro:~# ip link set can0 up
flexcan 2090000.flexcan can0: writing ctrl=0x01232054
root@imx6-tinyrexpro:~# candump can0 &
[1] 847
root@imx6-tinyrexpro:~# cansend can0 123#DEADBEEF
root@imx6-tinyrexpro:~#   can0  123   [4]  DE AD BE EF
</syntaxhighlight>

== Camera Input  ==
'''''Input:''''' Connect RPi camera module into CSI interface and check if it is detected on I2C bus<br />
'''''Output:''''' I2C address 0x36 is occupied and under use
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- UU -- -- -- 3a -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: 50 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- -- 
</syntaxhighlight><br/>

'''''Input:''''' Connect RPi camera module into CSI interface and check kernel modules<br />
'''''Output:''''' Device driver ov5647_camera_mipi_int(or ov5647_camera_mipi) is loaded
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# lsmod
Module                  Size  Used by
mxc_v4l2_capture       28532  2 
ipu_bg_overlay_sdc      5401  1 mxc_v4l2_capture
ipu_still               2528  1 mxc_v4l2_capture
ipu_prp_enc             5943  1 mxc_v4l2_capture
ipu_csi_enc             3863  1 mxc_v4l2_capture
ipu_fg_overlay_sdc      6217  1 mxc_v4l2_capture
ov5647_camera_mipi     30980  0 
adv7610_video           6270  0 
v4l2_int_device         2930  3 ov5647_camera_mipi_int,adv7610_video,mxc_v4l2_capture
mxc_dcic                6569  0 
evbug                   1875  0 
</syntaxhighlight><br />

'''''Input:''''' Connect RPi camera module into CSI interface and capture image<br />
'''''Output:''''' The image is displayed on HDMI monitor
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# echo 2 > /sys/bus/i2c/devices/1-0036/ov5647_mode 
root@imx6-tinyrexpro:~# gst-launch-1.0 v4l2src device="/dev/video1" ! video/x-bayer,width=1920,height=1080,framerate=30/1 ! queue ! bayer2rgb ! videoconvert ! fbdevsink
display(/dev/fb0) resolution is (1920x1080).
ipu_csi_window_size_crop: Error left=0 top=56595559
ERROR: unrecognized std! 0 (PAL=ff, NTSC=b000

(gst-plugin-scanner:1175): GStreamer-CRITICAL **: gst_caps_simplify: assertion 'GST_IS_CAPS (caps)' failed

(gst-plugin-scanner:1175): GStreamer-CRITICAL **: gst_caps_append: assertion 'GST_IS_CAPS (caps2)' failed

(gst-plugin-scanner:1175): GStreamer-CRITICAL **: gst_caps_simplify: assertion 'GST_IS_CAPS (caps)' failed

(gst-plugin-scanner:1175): GStreamer-CRITICAL **: gst_caps_append: assertion 'GST_IS_CAPS (caps2)' failed
ipu_csi_window_size_crop: Error left=0 top=56595559
ipu_csi_window_size_crop: Error left=0 top=56595559
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
ERROR: v4l2 capture: unsupported ioctrl!
WARNING: from element /GstPipeline:pipeline0/GstFBDEVSink:fbdevsink0: A lot of buffers are being dropped.
Additional debug info:
/home/marek/workdir/imx6/yocto/fsl-release-bsp-tinyrex/build-x11/tmp/work/cortexa9hf-vfp-neon-poky-linux-gnueabi/gstreamer1.0/1.4.1-r0/gstreamer-1.4.1/libs/gst/base/gstbasesin:
There may be a timestamping problem, or this computer is too slow.
power_down_callback: ipu0/csi0
^Chandling interrupt.
Interrupt: Stopping pipeline ...
Execution ended after 0:00:19.269515335
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...
power_down_callback: ipu0/csi1
</syntaxhighlight><br />

=== Alternative test ===
'''''Input:''''' Connect RPi camera module into CSI interface and capture image<br />
'''''Output:''''' The image is displayed on HDMI monitor
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# echo 1 > /sys/bus/i2c/devices/1-0036/ov5647_mode
root@imx6-tinyrexpro:~# gst-launch-1.0 v4l2src device="/dev/video1" ! video/x-bayer,width=1280,height=720,framerate=30/1 ! queue ! bayer2rgb ! videoconvert ! fbdevsink
ipu_csi_window_size_crop: Error left=0 top=56595559
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
ERROR: v4l2 capture: unsupported ioctrl!
power_down_callback: ipu0/csi0
^Chandling interrupt.
Interrupt: Stopping pipeline ...
Execution ended after 0:00:09.472884668
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...
root@imx6-tinyrexpro:~# power_down_callback: ipu0/csi1
</syntaxhighlight>

Software integration and additional commands or settings of CSI camera interface are available on separate [[iMX6 TinyRex Camera|iMX6 TinyRex Camera page]].

== Ethernet ==
'''''Input:''''' None<br />
'''''Output:''''' Device driver is available<br />
'''''Note:''''' MAC address should be identical with the address on the sticker placed on module
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# ip addr show dev eth0
3: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
    link/ether 00:0d:15:00:db:b6 brd ff:ff:ff:ff:ff:ff
</syntaxhighlight>

'''''Input:''''' Plug Ethernet cable into connector and issue DHCP command<br />
'''''Output:''''' IPv4 address is assigned
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# dmesg | tail
...
libphy: 2188000.ethernet:03 - Link is Up - 1000/Full
IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
</syntaxhighlight>

<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# udhcpc -i eth0
udhcpc (v1.22.1) started
Sending discover...
Sending select for 192.168.0.115...
Lease of 192.168.0.115 obtained, lease time 356
</syntaxhighlight>

== HDMI Input ==
'''''Input:''''' Plug HD signal generator (1280x720p) (e.g. HDMI output from a PC or GoPro camera) into micro HDMI Input connector and capture input signal<br />
'''''Output:''''' Input signal is visible on the connected monitor
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# gst-launch-1.0 v4l2src device="/dev/video0" ! video/x-raw,width=1280,height=720,framerate=30/1 ! videoconvert ! autovideosink
Setting pipeline to PAUSED ...
display(/dev/fb0) resolution is (1920x1080).
====== OVERLAYSINK: 4.1.4 build on Jan 23 2017 13:24:12. ======
display(/dev/fb0) resolution is (1920x1080).
display(/dev/fb0) resolution is (mxc_v4l2_output v4l2_out: Bypass IC.
1920x1080).
mxc_v4l2_output v4l2_out: Bypass IC.
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
ERROR: v4l2 capture: unsupported ioctrl!
ERROR: v4l2 capture: unsupported ioctrl!
^Chandling interrupt.
Interrupt: Stopping pipeline ...
Execution ended after 0:00:09.216782001
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Total showed frames (256), display master blited (256), playing for (0:00:09.217285001), fps (27.774).
Setting pipeline to NULL ...
Freeing pipeline ...
</syntaxhighlight>

or

<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# gst-launch imxv4l2src ! autovideosink
ipu_csi_window_size_crop: Error left=0 top=56595559
MAX resolution 1920x1080

(gst-plugin-scanner:1024): GLib-GObject-WARNING **: cannot register existing type 'GstVorbisDec'

(gst-plugin-scanner:1024): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed

(gst-plugin-scanner:1024): GStreamer-CRITICAL **: gst_element_register: assertion 'g_type_is_a (type, GST_TYPE_ELEMENT)' failed
power_down_callback: ipu0/csi0
MFW_GST_V4LSRC_PLUGIN 4.0.3 build on Jan 19 2016 21:47:11.
Setting pipeline to PAUSED ...
ipu_csi_window_size_crop: Error left=0 top=56595559
MFW_GST_V4LSINK_PLUGIN 4.0.3 build on Jan 19 2016 21:46:56.
ipu_csi_window_size_crop: Error left=0 top=56595559
ipu_csi_window_size_crop: Error left=0 top=56595559
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
full screen size:1920x1080
[V4L Update Display]: left=0, top=0, width=1920, height=1080
set v4l display crop sucessfully
set v4l rotate sucessfully
>>V4L_SINK: Actually buffer status:
        hardware buffer : 12
        software buffer : 0
power_down_callback: ipu0/csi1
imx-ipuv3 2400000.ipu: IPU Warning - IPU_INT_STAT_10 = 0x00080000
imx-ipuv3 2400000.ipu: IPU Warning - IPU_INT_STAT_10 = 0x00080000
imx-ipuv3 2400000.ipu: IPU Warning - IPU_INT_STAT_10 = 0x00080000
imx-ipuv3 2400000.ipu: IPU Warning - IPU_INT_STAT_10 = 0x00080000
imx-ipuv3 2400000.ipu: IPU Warning - IPU_INT_STAT_10 = 0x00080000
imx-ipuv3 2400000.ipu: IPU Warning - IPU_INT_STAT_10 = 0x00080000
Caught interrupt -- handling interrupt.
Interrupt: Stopping pipeline ...

(gst-launch-0.10:1023): GLib-CRITICAL **: Source ID 16 was not found when attempting to remove it
Execution ended after 186220685689 ns.
Setting pipeline to PAUSED ...
Running time 0:03:06.221020022 render fps 16.131
Setting pipeline to READY ...
Setting pipeline to NULL ...
Total rendered:3004
[--->FINALIZE v4l_sink
Freeing pipeline ...
power_down_callback: ipu0/csi0
</syntaxhighlight><br />

Software integration of HDMI Receiver ADV7610, additional commands and operation options are available on separate [[iMX6 TinyRex HDMI Input|iMX6 TinyRex HDMI Input page]].

== HDMI Output ==
'''''Input:''''' Connect LCD monitor to baseboard<br />
'''''Output:''''' Desktop UI is correctly displayed<br />
[[image:iMX6_TinyRex_Development_kit-HDMI_terminal.jpg|600px]]

== I2C ==
'''''Input:''''' Scan I2C bus 0<br />
'''''Output:''''' Available devices:<br />
* HDMI Output EDID (0x50)
* EEPROM (0x56)
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# i2cdetect -y 0
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: 30 -- -- -- -- -- -- 37 -- -- 3a -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: UU -- -- -- -- -- -- 57 -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --  
</syntaxhighlight>

'''''Input:''''' Scan I2C bus 1<br />
'''''Output:''''' Available devices:<br />
* CSI Camera (0x36)
* HDMI Input HDCP (0x3a)
* HDMI Input EDID (0x50)
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- UU -- -- -- 3a -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: 50 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --     
</syntaxhighlight>

'''''Input:''''' Scan I2C bus 2<br />
'''''Output:''''' Available devices:<br />
* HDMI Input chip (0x22 0x26 0x32 0x34 0x36 0x3e 0x40 0x4c)
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# i2cdetect -y 2
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- UU -- -- -- UU -- -- -- -- -- -- -- -- -- 
30: -- -- UU -- UU -- UU -- -- -- -- -- -- -- UU -- 
40: UU -- -- -- -- -- -- -- -- -- -- -- UU -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- -- 
</syntaxhighlight>

'''''Input:''''' Trigger I2C EEPROM detection<br />
'''''Output:''''' I2C EEPROM is detected
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# echo -n "0-0056" > /sys/bus/i2c/drivers/at24/unbind
root@imx6-tinyrexpro:~# echo -n "0-0056" > /sys/bus/i2c/drivers/at24/bind 
at24 0-0056: 131072 byte 24c1024 EEPROM, writable, 1 bytes/write
</syntaxhighlight>

'''''Input:''''' Write and Read data from I2C EEPROM<br />
'''''Output:''''' If successful, console text 'Data are the same' should appear
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# echo -n "0123" > eeprom_in
root@imx6-tinyrexpro:~# cat eeprom_in > /sys/bus/i2c/devices/0-0056/eeprom
root@imx6-tinyrexpro:~# head -c 4 /sys/bus/i2c/devices/0-0056/eeprom > eeprom_out
root@imx6-tinyrexpro:~# diff eeprom_in eeprom_out && echo "Data are the same"
Data are the same
</syntaxhighlight>

=== Altarnative test ===
'''''Input:''''' List I2C bus 0, 1 and 2<br />
'''''Output:''''' Available devices are displayed
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# ls /sys/bus/i2c/devices/i2c-0 | grep ^[0]
0-0050
0-0056
0-0057
root@imx6-tinyrexpro:~# ls /sys/bus/i2c/devices/i2c-1 | grep ^[1]
1-0036
root@imx6-tinyrexpro:~# ls /sys/bus/i2c/devices/i2c-2 | grep ^[2]
2-0022
2-0026
2-0032
2-0034
2-0036
2-003e
2-0040
2-004c
</syntaxhighlight>

== User LED ==
'''''Input:''''' None<br />
'''''Output:''''' Red LED assembled on module switches from ON to OFF state with heartbeat pulses afterwards
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# echo -n "none" > /sys/devices/soc0/leds*/leds/module-led/trigger 
root@imx6-tinyrexpro:~# echo -n "1" > /sys/devices/soc0/leds*/leds/module-led/brightness
root@imx6-tinyrexpro:~# echo -n "0" > /sys/devices/soc0/leds*/leds/module-led/brightness
root@imx6-tinyrexpro:~# echo -n "heartbeat" >  /sys/devices/soc0/leds*/leds/module-led/trigger 
</syntaxhighlight>

== DDR memory ==
'''''Input:''''' None<br />
'''''Output:''''' Memory test passes without any error
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# memtester 2G 1
memtester version 4.1.3 (32-bit)
Copyright (C) 2010 Charles Cazabon.
Licensed under the GNU General Public License version 2 (only).

pagesize is 4096
pagesizemask is 0xfffff000
want 2048MB (2147483648 bytes)
got  267MB (280412160 bytes), trying mlock ...locked.
Loop 1/1:
  Stuck Address       : ok         
  Random Value        : ok
  Compare XOR         : ok
  Compare SUB         : ok
  Compare MUL         : ok
  Compare DIV         : ok
  Compare OR          : ok
  Compare AND         : ok
  Sequential Increment: ok
  Solid Bits          : ok         
  Block Sequential    : ok         
  Checkerboard        : ok         
  Bit Spread          : ok         
  Bit Flip            : ok         
  Walking Ones        : ok         
  Walking Zeroes      : ok         

Done.
</syntaxhighlight><br />

Further information about DDR3 memories and its calibration can be accessed in [[iMX6 TinyRex Memory Calibration|Memory Calibration details]].

== PCI Express ==
The procedure uses to a WiFi wireless card to test PCIe interface. More details concerning wireless cards are located on [[iMX6 TinyRex Wireless|WiFi and Bluetooth Cards page]] .<br/><br />

'''''Input:''''' Plug Wireless WiFi Link 4965AGN mini PCIe card into mini PCIe slot<br />
'''''Output:''''' Card is detected by system
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# lspci 
00:00.0 PCI bridge: Device 16c3:abcd (rev 01)
01:00.0 Network controller: Intel Corporation PRO/Wireless 4965 AG or AGN [Kedron] Network Connection (rev 61)
</syntaxhighlight>

'''''Input:''''' Plug Wireless WiFi Link 4965AGN mini PCIe card into mini PCIe slot<br />
'''''Output:''''' Wireless WiFi card firmware is loaded
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# dmesg | grep iwl4965
iwl4965: Intel(R) Wireless WiFi 4965 driver for Linux, in-tree:
iwl4965: Copyright(c) 2003-2011 Intel Corporation
iwl4965 0000:01:00.0: Detected Intel(R) Wireless WiFi Link 4965AGN, REV=0x4
iwl4965 0000:01:00.0: device EEPROM VER=0x36, CALIB=0x5
iwl4965 0000:01:00.0: Tunable channels: 13 802.11bg, 19 802.11a channels
iwl4965 0000:01:00.0: loaded firmware version 228.61.2.24
</syntaxhighlight>

'''''Input:''''' Plug Wireless WiFi Link 4965AGN mini PCIe card into mini PCIe slot<br />
'''''Output:''''' Card scans neighbour networks
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# rfkill unblock wlan
root@imx6-tinyrexpro:~# ip link set wlan0 up
IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
root@imx6-tinyrexpro:~# iw dev wlan0 scan
BSS 20:aa:4b:7e:21:97(on wlan0)
        TSF: 4605781864521 usec (53d, 07:23:01)
        freq: 5220
        beacon interval: 100 TUs
        capability: ESS Privacy ShortPreamble (0x0031)
        signal: -76.00 dBm
        last seen: 0 ms ago
        SSID: OpenWrt5g
        Supported rates: 6.0* 9.0 12.0* 18.0 24.0* 36.0 48.0 54.0 
        DS Parameter set: channel 44
        Country: CZ     Environment: Indoor/Outdoor
                Channels [36 - 48] @ 23 dBm
        RSN:     * Version: 1
                 * Group cipher: CCMP
                 * Pairwise ciphers: CCMP
                 * Authentication suites: PSK
                 * Capabilities: 16-PTKSA-RC 1-GTKSA-RC (0x000c)
        WPA:     * Version: 1
                 * Group cipher: CCMP
                 * Pairwise ciphers: CCMP
                 * Authentication suites: PSK
        Extended capabilities: 6
        WMM:     * Parameter version 1
                 * BE: CW 15-1023, AIFSN 3
                 * BK: CW 15-1023, AIFSN 7
                 * VI: CW 7-15, AIFSN 2, TXOP 3008 usec
                 * VO: CW 3-7, AIFSN 2, TXOP 1504 usec
</syntaxhighlight>

=== Alternative test ===
'''''Input:''''' Plug Wireless WiFi Link 4965AGN mini PCIe card into mini PCIe slot<br />
'''''Output:''''' Card scans neighbour networks
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# ip link set wlan0 up
IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
root@imx6-tinyrexpro:~# iwlist wlan0 scan
wlan0     Scan completed :
          Cell 01 - Address: 20:AA:4B:7E:21:97
                    Channel:44
                    Frequency:5.22 GHz (Channel 44)
                    Quality=38/70  Signal level=-72 dBm  
                    Encryption key:on
                    ESSID:"OpenWrt5g"
                    Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s
                              36 Mb/s; 48 Mb/s; 54 Mb/s
                    Mode:Master
                    Extra:tsf=0000072735a29d05
                    Extra: Last beacon: 30ms ago
                    IE: Unknown: 00094F70656E5772743567
                    IE: Unknown: 01088C129824B048606C
                    IE: Unknown: 03012C
                    IE: Unknown: 0706435A20240417
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : PSK
                    IE: WPA Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : PSK
                    IE: Unknown: 7F080000000000000040
                    IE: Unknown: DD180050F2020101000003A4000027A4000042435E0062322F00
</syntaxhighlight>

== SATA ==
'''''Input:''''' Power off the baseboard, connect HDD to SATA connector, provide power for the hard drive and turn on the board<br />
'''''Output:''''' HDD is detected
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# dmesg | grep -i -e sata -e ata1
ahci-imx 2200000.sata: fsl,transmit-level-mV not specified, using 00000024
ahci-imx 2200000.sata: fsl,transmit-boost-mdB not specified, using 00000480
ahci-imx 2200000.sata: fsl,transmit-atten-16ths not specified, using 00002000
ahci-imx 2200000.sata: fsl,receive-eq-mdB not specified, using 05000000
ahci-imx 2200000.sata: SSS flag set, parallel bus scan disabled
ahci-imx 2200000.sata: AHCI 0001.0300 32 slots 1 ports 3 Gbps 0x1 impl platform mode
ahci-imx 2200000.sata: flags: ncq sntf stag pm led clo only pmp pio slum part ccc apst 
ata1: SATA max UDMA/133 mmio [mem 0x02200000-0x02203fff] port 0x100 irq 71
ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata1.00: ATA-8: WDC WD1600BEVT-22ZCT0, 11.01A11, max UDMA/133
ata1.00: 312581808 sectors, multi 0: LBA48 NCQ (depth 31/32)
ata1.00: configured for UDMA/133
</syntaxhighlight>

'''''Input:''''' Generate a dummy file and copy this file into HDD and compare checksums<br />
'''''Output:''''' Both file are identical and have the same checksum
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# umount /dev/sda[1-9]
root@imx6-tinyrexpro:~# dd if=/dev/zero of=/dev/sda bs=512 count=1
1+0 records in
1+0 records out
512 bytes (512 B) copied, 0.361743 s, 1.4 kB/s
root@imx6-tinyrexpro:~# fdisk /dev/sda
...


The number of cylinders for this disk is set to 19457.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
   (e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-19457, default 1): Using default value 1
Last cylinder or size or sizeM or sizeK (1-19457, default 19457): Using default value 19457

Command (m for help): t
Selected partition 1
Hex code (type L to list codes): c
Changed system type of partition 1 to c (Win95 FAT32 (LBA))

Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table
 sda: sda1
root@imx6-tinyrexpro:~# umount /dev/sda1
root@imx6-tinyrexpro:~# mkfs.vfat -F32 /dev/sda1
root@imx6-tinyrexpro:~# mount /dev/sda1 /media/
root@imx6-tinyrexpro:~# rm -f file.txt /media/file.txt
root@imx6-tinyrexpro:~# dd if=/dev/urandom of=file.txt count=1024 bs=1024
1024+0 records in
1024+0 records out
1048576 bytes (1.0 MB) copied, 0.434573 s, 2.4 MB/s
root@imx6-tinyrexpro:~# cp file.txt /media/
root@imx6-tinyrexpro:~# md5sum file.txt /media/file.txt
b8e8141b61813fcc08a6164833729e3b  file.txt
b8e8141b61813fcc08a6164833729e3b  /media/file.txt
root@imx6-tinyrexpro:~# rm -f file.txt /media/file.txt
root@imx6-tinyrexpro:~# umount /dev/sda1
</syntaxhighlight><br />

SATA device can be used as a default bootlader and filesystem source. [[iMX6 TinyRex SATA|SATA Interface page]] contains detailed steps to follow.

== SD card ==
'''''Input:''''' SD card is plugged in<br />
'''''Output:''''' Files stored on SD card are listed
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# dmesg | grep mmc
mmc0: new high speed SD card at address aaaa
mmcblk1: mmc0:aaaa SU02G 1.84 GiB
 mmcblk1: p1
root@imx6-tinyrexpro:~# mount /dev/mmcblk1p1 /media/
root@imx6-tinyrexpro:~# ls -la /media
total 118084
drwxr-xr-x  4 root root        8192 Jan  1  1970 .
drwxr-xr-x 22 root linaro      4096 Dec 20 09:30 ..
-rwxr-xr-x  1 root root   120886176 Dec 22 15:11 78.avi
drwxr-xr-x  8 root root        8192 Oct 10 16:48 Pictures processed
drwxr-xr-x  2 root root        8192 Oct 10 16:44 iMX6 Rex Moduel Layout videos
</syntaxhighlight>

== SPI Flash Memory ==
'''''Input:''''' Trigger M25P80 flash detection<br />
'''''Output:''''' SPI Flash sst25vf032b is detected
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# echo -n "spi0.0" > /sys/bus/spi/drivers/m25p80/unbind
root@imx6-tinyrexpro:~# echo -n "spi0.0" > /sys/bus/spi/drivers/m25p80/bind 
m25p80 spi0.0: found sst25vf032b, expected m25p32
m25p80 spi0.0: sst25vf032b (4096 Kbytes)
</syntaxhighlight>

== Suspend ==
'''''Input:''''' Put module into suspend state (mem state). Wait 10s and then press USER button<br />
'''''Output:''''' Module wakes up
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# echo mem > /sys/power/state
PM: Syncing filesystems ... done.
Freezing user space processes ... (elapsed 0.005 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
Suspending console(s) (use no_console_suspend to debug)
fec 2188000.ethernet eth0: Graceful transmit stop did not complete!
PM: suspend of devices complete after 31.996 msecs
PM: suspend devices took 0.030 seconds
PM: late suspend of devices complete after 0.511 msecs
PM: noirq suspend of devices complete after 11.941 msecs
Disabling non-boot CPUs ...
PM: noirq resume of devices complete after 20.111 msecs
PM: early resume of devices complete after 0.399 msecs
PM: resume of devices complete after 412.384 msecs
PM: resume devices took 0.410 seconds
Restarting tasks ... done.
root@imx6-tinyrexpro:~#
</syntaxhighlight>

'''''Input:''''' Put module into suspend state (standby state). Wait 10s and then press USER button<br />
'''''Output:''''' Module wakes up
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# echo standby > /sys/power/state
PM: Syncing filesystems ... done.
Freezing user space processes ... (elapsed 0.005 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
Suspending console(s) (use no_console_suspend to debug)
fec 2188000.ethernet eth0: Graceful transmit stop did not complete!
PM: suspend of devices complete after 31.989 msecs
PM: suspend devices took 0.030 seconds
PM: late suspend of devices complete after 0.532 msecs
PM: noirq suspend of devices complete after 11.862 msecs
Disabling non-boot CPUs ...
PM: noirq resume of devices complete after 20.186 msecs
PM: early resume of devices complete after 0.397 msecs
PM: resume of devices complete after 412.337 msecs
PM: resume devices took 0.410 seconds
Restarting tasks ... done.
root@imx6-tinyrexpro:~#
</syntaxhighlight>

'''''Input:''''' Set RTC wakeup event after 10s and put module into suspend state (standby state)<br />
'''''Output:''''' Module wakes up by itself
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# echo +10 > /sys/class/rtc/rtc0/wakealarm && echo standby > /sys/power/state
PM: Syncing filesystems ... done.
Freezing user space processes ... (elapsed 0.005 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
Suspending console(s) (use no_console_suspend to debug)
fec 2188000.ethernet eth0: Graceful transmit stop did not complete!
PM: suspend of devices complete after 32.020 msecs
PM: suspend devices took 0.030 seconds
PM: late suspend of devices complete after 0.515 msecs
PM: noirq suspend of devices complete after 11.887 msecs
Disabling non-boot CPUs ...
PM: noirq resume of devices complete after 19.990 msecs
PM: early resume of devices complete after 0.392 msecs
PM: resume of devices complete after 412.311 msecs
PM: resume devices took 0.410 seconds
Restarting tasks ... done.
root@imx6-tinyrexpro:~#
</syntaxhighlight>

== UART serial console ==
'''''Input:''''' Connect USB to UART cable into baseboard connector and open serial console with baud rate 115200 8n1<br />
'''''Output:''''' The board is controlled and responsive to serial terminal commands
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# uname -a
Linux imx6-tinyrexpro 3.14.43-yocto+g4b13aeb #1 SMP PREEMPT Tue Jan 19 21:42:39 CET 2016 armv7l GNU/Linux
</syntaxhighlight>

== USB ==
'''''Input:''''' Plug USB flash drive with single VFAT partition into bottom USB connector<br />
'''''Output:''''' Filesystem recognises the flash drive and automatically mounts it
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# lsusb
Bus 001 Device 002: ID 125f:d31a A-DATA Technology Co., Ltd. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

root@imx6-tinyrexpro:~# mount | grep /run/media/sd*
/dev/sda1 on /run/media/sda1 type vfat (rw,relatime,gid=6,fmask=0007,dmask=0007,allow_utime=0020,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)
</syntaxhighlight>

'''''Input:''''' Generate a dummy file and copy it into USB flash drive<br />
'''''Output:''''' Generated file and copied file have the same checksum
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# rm -f file.txt /run/media/sda1/file.txt 
root@imx6-tinyrexpro:~# dd if=/dev/urandom of=file.txt count=1024 bs=1024
1024+0 records in
1024+0 records out
1048576 bytes (1.0 MB) copied, 0.435065 s, 2.4 MB/s
root@imx6-tinyrexpro:~# cp file.txt /run/media/sda1/
root@imx6-tinyrexpro:~# md5sum file.txt /run/media/sda1/file.txt 
b8e8141b61813fcc08a6164833729e3b  file.txt
b8e8141b61813fcc08a6164833729e3b  /run/media/sda1/file.txt
root@imx6-tinyrexpro:~# rm file.txt /run/media/sda1/file.txt
</syntaxhighlight>

== USB OTG ==
'''''Input:''''' Load USB serial gadget driver and connect baseboard to host PC over micro USB cable<br />
'''''Output:''''' Driver is successfully loaded and host PC detects a new USB serial gadget device<br /><br />

iMX6 Rex Development kit:
<syntaxhighlight lang="bash">
root@imx6-tinyrexpro:~# modprobe -i g_serial
g_serial gadget: Gadget Serial v2.4
g_serial gadget: g_serial ready
root@imx6-tinyrexpro:~# g_serial gadget: high-speed config #2: CDC ACM config
</syntaxhighlight>

Host PC:
<syntaxhighlight lang="bash">
user@voipac:~$ lsusb 
...
Bus 001 Device 014: ID 0525:a4a7 Netchip Technology, Inc. Linux-USB Serial Gadget (CDC ACM mode)
...
</syntaxhighlight>