iMX6 Rex Ultra Accessing and Testing Peripherals

Elemental operations of iMX6 Rex Development kit interfaces in Ultra configuration are shown on this page.

Prerequisites

Hardware

DC power supply (5V, 2A)
iMX6 Rex Module Ultra
iMX6 Rex Baseboard

Peripherals and Accessories

1x FullHD monitor with Audio output
1x LVDS touchscreen display
2x MicroSD card
1x MiniPCIe WiFi card
1x MiniPCIe 3G card
1x SATA HDD drive
2x USB FLASH drive
1x headphones
1x microphone

Cables

Ethernet cable
HDMI cable
Micro USB cable
RS-232 cable

Audio

Input: Search kernel log for SGTL5000 chip
Output: Audio chip is detected and bound as an input device

root@imx6-rexpro:~# dmesg | grep -i sgtl5000
sgtl5000 0-000a: sgtl5000 revision 0x11
sgtl5000 0-000a: Using internal LDO instead of VDDD
imx-sgtl5000 sound.23: sgtl5000 <-> 2028000.ssi mapping ok
  #0: imx-audio-sgtl5000

Input: Run alsamixer command
Output: Card imx-audio-sgtl5000 is available

root@imx6-rexpro:~# alsamixer
lqqqqqqqqqqqqqqqqqqqqqqqqqqqqq AlsaMixer v1.0.28 qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqk
x Card: imx-audio-sgtl5000                             F1:  Help               x
x Chip:                                                F2:  System information x
x View: F3:[Playback] F4: Capture  F5: All             F6:  Select sound card  x
x Item: Headphone [dB gain: -20.00, -20.00]            Esc: Exit               x
x                                                                              x
x     lqqk                       lqqk     lqqk                                 x
x     x  x                       x  x     x  x                                 x
x     x  x                       x  x     x  x                                 x
x     x  x                       x  x     x  x                                 x
x     x  x                       xaax     x  x                                 x
x     x  x                       xaax     x  x                                 x
x     x  x                       xaax     x  x                                 x
x     x  x                       xaax     x  x                                 x
x     x  x                       xaax     x  x                                 x
x     x  x                       xaax     x  x                                 x
x     xaax                       xaax     x  x                                 x
x     xaax                       xaax     x  x                                 x
x     mqqj     DAC      lqqk     mqqj     mqqj     lqqk    MIC_IN    lqqk      x
x                       xOOx                       xMMx              xOOx      x
x                       mqqj                       mqqj              mqqj      x
x    23<>23                     75<>75     0                                   x
x  <Headphon>Headphon Headphon   PCM      Mic    Capture  Capture  Capture     x
mqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqj

Input: Boot-up module with HDMI cable plugged in, connect headphones into LINE_OUT connector and plug-in USB flash drive with mp3 file
Output: Sound is played and heard

root@imx6-rexultra:~# aplay -D sysdefault:CARD=sgtl5000audio multimedia/sample.wav
#root@imx6-rexultra:~# aplay -D sysdefault:CARD=imxaudiosgtl500 multimedia/sample.wav 
Playing WAVE 'multimedia/sample.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo

root@imx6-rexultra:~# aplay -D sysdefault:CARD=imxhdmisoc multimedia/sample.wav 
Playing WAVE 'multimedia/sample.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo

Input: Plug headphones into HEADPHONES connector and mic into MICROPHONE connector
Output: Microphone sound is played in headphones

root@imx6-rexultra:~# arecord -D sysdefault:CARD=sgtl5000audio -t wav -f cd | aplay -D sysdefault:CARD=imxaudiosgtl500
#root@imx6-rexultra:~# arecord -D sysdefault:CARD=imxaudiosgtl500 -t wav -f cd | aplay -D sysdefault:CARD=imxaudiosgtl500

Input: Plug headphones into HEADPHONES connector and mic into MICROPHONE connector
Output: Sound is recorded and played afterwards

root@imx6-rexultra:~# arecord -D sysdefault:CARD=sgtl5000audio -t wav -f cd -d 10 multimedia/recorded.wav 
#root@imx6-rexultra:~# arecord -D sysdefault:CARD=imxaudiosgtl500 -t wav -f cd -d 10 multimedia/recorded.wav 
Recording WAVE 'multimedia/recorded.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
root@imx6-rexultra:~# aplay -D sysdefault:CARD=sgtl5000audio multimedia/recorded.wav 
#root@imx6-rexultra:~# aplay -D sysdefault:CARD=imxaudiosgtl500 multimedia/recorded.wav 
Playing WAVE 'multimedia/recorded.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo

User button

Input: Press and hold USER button (pca9535 driver is used)
Output: GPIO register is read and displayed state of the button

root@imx6-rexpro:~# echo 511 > /sys/class/gpio/export
root@imx6-rexpro:~# echo in > /sys/class/gpio/gpio511/direction
root@imx6-rexpro:~# cat /sys/class/gpio/gpio511/value
1
root@imx6-rexpro:~# cat /sys/class/gpio/gpio511/value
0

Alternative test

Input: Press the USER button
Output: Button events 1 and 0 are generated

root@imx6-tinyrexultra:~# 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............|

Reset button

Input: Press the RESET button
Output: Module will execute bootloader immediately with "Reset cause: POR"
Note: Module should never freeze or hang after the reset button was pressed. Testing the operation 10 times gives a reliable result

U-Boot 2014.10-dirty (Mar 12 2016 - 11:34:54)

CPU:   Freescale i.MX6Q rev1.2 at 792 MHz
Reset cause: POR
Board: MX6 Rex - pro
I2C:   ready
DRAM:  2 GiB
MMC:   FSL_SDHC: 0, FSL_SDHC: 1
SF: Detected SST25VF032B with page size 256 Bytes, erase size 4 KiB, total 4 MiB
*** Warning - bad CRC, using default environment

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

Ethernet

Input: None
Output: Device driver is available
Note: MAC address should be identical with the address on the sticker placed on module

root@imx6-rexpro:~# ip addr show dev eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0d:15:00:cc:e2 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::20d:15ff:fe00:cce2/64 scope link

Input: Plug Ethernet cable into connector and issue DHCP command
Output: IPv4 address is assigned

root@imx6-rexpro:~# dmesg | tail
...
libphy: 2188000.ethernet:03 - Link is Up - 100/Full
IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

root@imx6-rexpro:~# udhcpc -i eth0
udhcpc (v1.22.1) started
Sending discover...
Sending select for 192.168.0.178...
Lease of 192.168.0.178 obtained, lease time 600

HDMI Output

Input: Connect LCD monitor to baseboard
Output: Desktop UI is correctly displayed
600px

I2C

Input: Scan I2C bus 0
Output: Available devices:

SGTL5000 audio (0x0A)

root@imx6-rexpro:~# i2cdetect -y 0
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- UU -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --

Input: Scan I2C bus 1
Output: Available devices:

GPIO expander (0x27)
touchscreen TSC2007 (0x48)
HDMI Output EDID (0x50)
RTC clock (0x51)
EEPROM (0x57)

Note: HDMI monitor must be disconnected otherwise I2C bus 1 scanning bus might freeze.

root@imx6-rexpro:~# i2cdetect -y 1 
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- 18 -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- UU -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- -- 
50: UU UU -- -- -- -- -- UU -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --

Input: Scan I2C bus 2
Output: I2C bus 2 is allocated for external use via System Header

root@imx6-rexpro:~# i2cdetect -y 2
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --

Input: Trigger I2C GPIO expander detection.
Output: GPIO expander is detected

root@imx6-rexpro:~# echo -n "1-0027" > /sys/bus/i2c/drivers/pca953x/unbind
root@imx6-rexpro:~# echo -n "1-0027" > /sys/bus/i2c/drivers/pca953x/bind
pca953x 1-0027: interrupt support not compiled in

Input: Trigger I2C RTC detection
Output: RTC is detected

root@imx6-rexpro:~# echo -n "1-0051" > /sys/bus/i2c/drivers/rtc-pcf8563/unbind
root@imx6-rexpro:~# echo -n "1-0051" > /sys/bus/i2c/drivers/rtc-pcf8563/bind
rtc-pcf8563 1-0051: chip found, driver version 0.4.3
rtc-pcf8563 1-0051: low voltage detected, date/time is not reliable.
rtc-pcf8563 1-0051: low voltage detected, date/time is not reliable.
rtc rtc1: invalid alarm value: 2030-10-20 41:58:0
rtc-pcf8563 1-0051: rtc core: registered rtc-pcf8563 as rtc1

Input: Trigger I2C EEPROM detection
Output: I2C EEPROM is detected

root@imx6-rexpro:~# echo -n "1-0057" > /sys/bus/i2c/drivers/at24/unbind
root@imx6-rexpro:~# echo -n "1-0057" > /sys/bus/i2c/drivers/at24/bind 
at24 1-0057: 256 byte 24c02 EEPROM, writable, 1 bytes/write

Input: Write and Read data from I2C EEPROM
Output: If successful, console text 'Data are the same' should appear

root@imx6-rexpro:~# echo -n "0123" > eeprom_in
root@imx6-rexpro:~# cat eeprom_in > /sys/bus/i2c/devices/1-0057/eeprom
root@imx6-rexpro:~# head -c 4 /sys/bus/i2c/devices/1-0057/eeprom > eeprom_out
root@imx6-rexpro:~# diff eeprom_in eeprom_out && echo "Data are the same"
Data are the same

Altarnative test

Input: List I2C bus 0, 1 and 2
Output: Available devices are displayed

root@imx6-rexpro:~# ls /sys/bus/i2c/devices/i2c-0 | grep ^[0]
0-000a
root@imx6-rexpro:~# ls /sys/bus/i2c/devices/i2c-1 | grep ^[1]
1-0048
1-0050
root@imx6-rexpro:~# ls /sys/bus/i2c/devices/i2c-2 | grep ^[2]

User LED

Input: None
Output: Red LED assembled on module switches from ON to OFF state with heartbeat pulses afterwards

root@imx6-tinyrexultra:~# echo -n "none" > /sys/devices/soc0/leds*/leds/module-led/trigger 
root@imx6-tinyrexultra:~# echo -n "1" > /sys/devices/soc0/leds*/leds/module-led/brightness
root@imx6-tinyrexultra:~# echo -n "0" > /sys/devices/soc0/leds*/leds/module-led/brightness
root@imx6-tinyrexultra:~# echo -n "heartbeat" >  /sys/devices/soc0/leds*/leds/module-led/trigger

Input: GPIO expander PCA9535 driver
Output: Red LED assembled on baseboard switches from ON to OFF state

root@imx6-rexpro:~# echo 510 > /sys/class/gpio/export
root@imx6-rexpro:~# echo out > /sys/class/gpio/gpio510/direction
root@imx6-rexpro:~# echo 1 > /sys/class/gpio/gpio510/value
root@imx6-rexpro:~# echo 0 > /sys/class/gpio/gpio510/value

LVDS display

Details how to properly connect display with LVDS and touchsreen interfaces are described on Display Set page.

Input: Configure kernel command line in uboot and boot up the module Output: GUI can be seen on LVDS screen

Rex U-Boot > setenv video 'video=mxcfb0:dev=ldb,edt570,if=RGB666 video=mxcfb1:off'
Rex U-Boot > boot

DDR memory

Input: None
Output: Memory test passes without any error

root@imx6-rexpro:~# 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.

Further information about DDR3 memories and its calibration can be accessed in Memory Calibration details.

Modem

Input: Plug HE910 3G card into PCIe mini 2 slot and plug SIM card into SIM1 slot
Output: HE910 3G card is detected and AT commands executed

root@imx6-rexultra:~# lsusb | grep -i 1bc7
Bus 001 Device 003: ID 1bc7:0021 Telit HE910

root@imx6-rexultra:~# cat > /etc/minirc.he910 << EOF
pu port             /dev/ttyACM0
pu baudrate         115200
pu bits             8
pu parity           N
pu stopbits         1
pu rtscts           No
pu xonxoff          No
pu escape-key       ^B
EOF
root@imx6-rexultra:~# echo "Press 'Ctrl+B z q' to exit"
root@imx6-rexultra:~# minicom -o he910
AT
AT+CPIN?
AT+CREG?
AT+COPS?

Log:

AT
OK
AT+CPIN?
+CPIN: READY

OK
AT+CREG?
+CREG: 0,1

OK
AT+COPS?
+COPS: 0,0,"Vodafone",0

OK

PCI Express

The procedure uses to a WiFi wireless card to test PCIe interface. More details concerning wireless cards are located on WiFi and Bluetooth Cards page .

Input: Plug Wireless WiFi Link 4965AGN mini PCIe card into mini PCIe slot 1
Output: Card is detected by system

root@imx6-rexpro:~# 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)

Input: Plug Wireless WiFi Link 4965AGN mini PCIe card into mini PCIe slot
Output: Wireless WiFi card firmware is loaded

root@imx6-rexpro:~# 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

Input: Plug Wireless WiFi Link 4965AGN mini PCIe card into mini PCIe slot
Output: Card scans neighbour networks

root@imx6-rexpro:~# rfkill unblock wlan
root@imx6-rexpro:~# ip link set wlan0 up
IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
root@imx6-rexpro:~# iw dev wlan0 scan
BSS 20:aa:4b:7e:21:97(on wlan0)
        TSF: 9263203904202 usec (107d, 05:06:43)
        freq: 5220
        beacon interval: 100 TUs
        capability: ESS Privacy ShortPreamble (0x0031)
        signal: -69.00 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

Alternative test

Input: Plug Wireless WiFi Link 4965AGN mini PCIe card into mini PCIe slot
Output: Card scans neighbour networks

root@imx6-rexpro:~# ip link set wlan0 up
IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
root@imx6-rexpro:~# iwlist wlan0 scan
wlan0     Scan completed :
          Cell 01 - Address: 20:AA:4B:7E:21:97
                    Channel:44
                    Frequency:5.22 GHz (Channel 44)
                    Quality=39/70  Signal level=-71 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=0000086d2e342cf9
                    Extra: Last beacon: 40ms 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

SATA

Input: Power off the baseboard, connect HDD to SATA connector, provide power for the hard drive and turn on the board
Output: HDD is detected

root@imx6-tinyrexultra:~# 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

Input: Generate a dummy file and copy this file into HDD and compare checksums
Output: Both file are identical and have the same checksum

root@imx6-tinyrexultra:~# umount /dev/sda[1-9]
root@imx6-tinyrexultra:~# 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-tinyrexultra:~# 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-tinyrexultra:~# umount /dev/sda1
root@imx6-tinyrexultra:~# mkfs.vfat -F32 /dev/sda1
root@imx6-tinyrexultra:~# mount /dev/sda1 /media/
root@imx6-tinyrexultra:~# rm -f file.txt /media/file.txt
root@imx6-tinyrexultra:~# 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-tinyrexultra:~# cp file.txt /media/
root@imx6-tinyrexultra:~# md5sum file.txt /media/file.txt
b8e8141b61813fcc08a6164833729e3b  file.txt
b8e8141b61813fcc08a6164833729e3b  /media/file.txt
root@imx6-tinyrexultra:~# rm -f file.txt /media/file.txt
root@imx6-tinyrexultra:~# umount /dev/sda1

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

SD card

Input: SD card is plugged in
Output: Files stored on SD card are listed

root@imx6-tinyrexultra:~# dmesg | grep mmc
mmc0: new high speed SD card at address aaaa
mmcblk1: mmc0:aaaa SU02G 1.84 GiB
 mmcblk1: p1
root@imx6-tinyrexultra:~# mount /dev/mmcblk1p1 /media/
root@imx6-tinyrexultra:~# 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

SPI Flash Memory

Input: Trigger M25P80 flash detection
Output: SPI Flash sst25vf032b is detected

root@imx6-tinyrexultra:~# echo -n "spi0.0" > /sys/bus/spi/drivers/m25p80/unbind
root@imx6-tinyrexultra:~# echo -n "spi0.0" > /sys/bus/spi/drivers/m25p80/bind 
m25p80 spi0.0: found sst25vf032b, expected m25p32
m25p80 spi0.0: sst25vf032b (4096 Kbytes)

Suspend

Input: Put module into suspend state (mem state). Wait 10s and then press USER button
Output: Module wakes up

root@imx6-tinyrexultra:~# 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-tinyrexultra:~#

Input: Put module into suspend state (standby state). Wait 10s and then press USER button
Output: Module wakes up

root@imx6-tinyrexultra:~# 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-tinyrexultra:~#

Input: Set RTC wakeup event after 10s and put module into suspend state (standby state)
Output: Module wakes up by itself

root@imx6-tinyrexultra:~# 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-tinyrexultra:~#

UART serial console

Input: Connect USB to UART cable into baseboard connector and open serial console with baud rate 115200 8n1
Output: The board is controlled and responsive to serial terminal commands

root@imx6-tinyrexultra:~# uname -a
Linux imx6-tinyrexultra 3.14.43-yocto+g4b13aeb #1 SMP PREEMPT Tue Jan 19 21:42:39 CET 2016 armv7l GNU/Linux

USB

Input: Plug USB flash drive with single VFAT partition into bottom USB connector
Output: Filesystem recognises the flash drive and automatically mounts it

root@imx6-tinyrexultra:~# 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-tinyrexultra:~# 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)

Input: Generate a dummy file and copy it into USB flash drive
Output: Generated file and copied file have the same checksum

root@imx6-tinyrexultra:~# rm -f file.txt /run/media/sda1/file.txt 
root@imx6-tinyrexultra:~# 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-tinyrexultra:~# cp file.txt /run/media/sda1/
root@imx6-tinyrexultra:~# md5sum file.txt /run/media/sda1/file.txt 
b8e8141b61813fcc08a6164833729e3b  file.txt
b8e8141b61813fcc08a6164833729e3b  /run/media/sda1/file.txt
root@imx6-tinyrexultra:~# rm file.txt /run/media/sda1/file.txt

USB OTG

Input: Load USB serial gadget driver and connect baseboard to host PC over micro USB cable
Output: Driver is successfully loaded and host PC detects a new USB serial gadget device

iMX6 Rex Development kit:

root@imx6-tinyrexultra:~# modprobe -i g_serial
g_serial gadget: Gadget Serial v2.4
g_serial gadget: g_serial ready
root@imx6-tinyrexultra:~# g_serial gadget: high-speed config #2: CDC ACM config

Host PC:

user@voipac:~$ lsusb 
...
Bus 001 Device 014: ID 0525:a4a7 Netchip Technology, Inc. Linux-USB Serial Gadget (CDC ACM mode)
...

iMX6 Rex Ultra Accessing and Testing Peripherals

Contents

Prerequisites

Hardware

Peripherals and Accessories

Cables

Audio

User button

Alternative test

Reset button

Ethernet

HDMI Output

I2C

Altarnative test

User LED

LVDS display

DDR memory

Modem

PCI Express

Alternative test

SATA

SD card

SPI Flash Memory

Suspend

UART serial console

USB

USB OTG

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