iMX6 TinyRex Ultra Accessing and Testing Peripherals
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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:
- HDMI Output EDID (0x50)
- EEPROM (0x56)
root@imx6-tinyrexultra:~# 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: -- -- -- -- -- -- -- --
Input: Scan I2C bus 1
Output: Available devices:
- CSI Camera (0x36)
- HDMI Input HDCP (0x3a)
- HDMI Input EDID (0x50)
root@imx6-tinyrexultra:~# 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: -- -- -- -- -- -- -- --
Input: Scan I2C bus 2
Output: Available devices:
- HDMI Input chip (0x22 0x26 0x32 0x34 0x36 0x3e 0x40 0x4c)
root@imx6-tinyrexultra:~# 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: -- -- -- -- -- -- -- --
Input: Trigger I2C EEPROM detection
Output: I2C EEPROM is detected
root@imx6-tinyrexultra:~# echo -n "0-0056" > /sys/bus/i2c/drivers/at24/unbind root@imx6-tinyrexultra:~# echo -n "0-0056" > /sys/bus/i2c/drivers/at24/bind at24 0-0056: 131072 byte 24c1024 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-tinyrexultra:~# echo -n "0123" > eeprom_in root@imx6-tinyrexultra:~# cat eeprom_in > /sys/bus/i2c/devices/0-0056/eeprom root@imx6-tinyrexultra:~# head -c 4 /sys/bus/i2c/devices/0-0056/eeprom > eeprom_out root@imx6-tinyrexultra:~# 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-tinyrexultra:~# ls /sys/bus/i2c/devices/i2c-0 | grep ^[0] 0-0050 0-0056 0-0057 root@imx6-tinyrexultra:~# ls /sys/bus/i2c/devices/i2c-1 | grep ^[1] 1-0036 root@imx6-tinyrexultra:~# 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
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
DDR memory
Input: None
Output: Memory test passes without any error
root@imx6-tinyrexultra:~# 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.
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
Output: Card is detected by system
root@imx6-tinyrexultra:~# 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-tinyrexultra:~# 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-tinyrexultra:~# rfkill unblock wlan
root@imx6-tinyrexultra:~# ip link set wlan0 up
IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
root@imx6-tinyrexultra:~# 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
Alternative test
Input: Plug Wireless WiFi Link 4965AGN mini PCIe card into mini PCIe slot
Output: Card scans neighbour networks
root@imx6-tinyrexultra:~# ip link set wlan0 up
IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
root@imx6-tinyrexultra:~# 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
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) ...