Difference between revisions of "iMX6 TinyRex Lite Accessing and Testing Peripherals"
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<div style="float:right">__TOC__</div> | <div style="float:right">__TOC__</div> | ||
| − | Elemental operations of iMX6 TinyRex Development Kit interfaces in Lite configuration are shown on this page. For more specified information such as | + | Elemental operations of iMX6 TinyRex Development Kit interfaces in Lite configuration are shown on this page. For more specified information such as Wireless options, refer to the dedicated [[iMX6 TinyRex Lite#Peripherals|Peripherals section]]. |
== Prerequisites == | == Prerequisites == | ||
| Line 15: | Line 15: | ||
=== Peripherals and Accessories === | === Peripherals and Accessories === | ||
* 1x FullHD monitor with Audio output | * 1x FullHD monitor with Audio output | ||
| − | |||
* 1x MicroSD card | * 1x MicroSD card | ||
* 1x MiniPCIe WiFi card | * 1x MiniPCIe WiFi card | ||
| − | |||
* 2x USB FLASH drive | * 2x USB FLASH drive | ||
=== Cables === | === Cables === | ||
* HDMI cable | * HDMI cable | ||
| − | |||
* Micro USB cable | * Micro USB cable | ||
* USB to UART cable | * USB to UART cable | ||
| Line 113: | Line 110: | ||
root@imx6-tinyrexlite:~# can0 123 [4] DE AD BE EF | root@imx6-tinyrexlite:~# can0 123 [4] DE AD BE EF | ||
</syntaxhighlight> | </syntaxhighlight> | ||
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== HDMI Output == | == HDMI Output == | ||
'''''Input:''''' Connect LCD monitor to the base board<br /> | '''''Input:''''' Connect LCD monitor to the base board<br /> | ||
'''''Output:''''' Desktop UI is displayed correctly<br /> | '''''Output:''''' Desktop UI is displayed correctly<br /> | ||
| − | [[image: | + | [[image:iMX6_TinyRex_Development_Kit-HDMI_terminal.png|580px]] |
== I2C == | == I2C == | ||
| Line 314: | Line 134: | ||
'''''Input:''''' Scan I2C bus 1<br /> | '''''Input:''''' Scan I2C bus 1<br /> | ||
| − | '''''Output:''''' | + | '''''Output:''''' The bus is reserved for external use |
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<syntaxhighlight lang="bash"> | <syntaxhighlight lang="bash"> | ||
root@imx6-tinyrexlite:~# i2cdetect -y 1 | root@imx6-tinyrexlite:~# i2cdetect -y 1 | ||
| Line 324: | Line 141: | ||
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | ||
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | ||
| − | 30: -- -- -- -- -- -- | + | 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- |
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | ||
| − | 50: | + | 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- |
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | ||
70: -- -- -- -- -- -- -- -- | 70: -- -- -- -- -- -- -- -- | ||
| Line 332: | Line 149: | ||
'''''Input:''''' Scan I2C bus 2<br /> | '''''Input:''''' Scan I2C bus 2<br /> | ||
| − | '''''Output:''''' | + | '''''Output:''''' The bus is reserved for external use |
| − | |||
<syntaxhighlight lang="bash"> | <syntaxhighlight lang="bash"> | ||
root@imx6-tinyrexlite:~# i2cdetect -y 2 | root@imx6-tinyrexlite:~# i2cdetect -y 2 | ||
| Line 339: | Line 155: | ||
00: -- -- -- -- -- -- -- -- -- -- -- -- -- | 00: -- -- -- -- -- -- -- -- -- -- -- -- -- | ||
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | ||
| − | 20: -- -- | + | 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- |
| − | 30: -- -- | + | 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- |
| − | 40: | + | 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- |
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | ||
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | ||
| Line 356: | Line 172: | ||
0-0057 | 0-0057 | ||
root@imx6-tinyrexlite:~# ls /sys/bus/i2c/devices/i2c-1 | grep ^[1] | root@imx6-tinyrexlite:~# ls /sys/bus/i2c/devices/i2c-1 | grep ^[1] | ||
| − | + | ||
root@imx6-tinyrexlite:~# ls /sys/bus/i2c/devices/i2c-2 | grep ^[2] | root@imx6-tinyrexlite:~# ls /sys/bus/i2c/devices/i2c-2 | grep ^[2] | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
Latest revision as of 08:53, 24 April 2022
Elemental operations of iMX6 TinyRex Development Kit interfaces in Lite configuration are shown on this page. For more specified information such as Wireless options, refer to the dedicated Peripherals section.
Prerequisites
Hardware
- DC power supply (5V, 2A)
- iMX6 TinyRex Module Lite
- iMX6 TinyRex Base Board
Peripherals and Accessories
- 1x FullHD monitor with Audio output
- 1x MicroSD card
- 1x MiniPCIe WiFi card
- 2x USB FLASH drive
Cables
- HDMI cable
- Micro USB cable
- USB to UART cable
User button
Input: Press the USER button
Output: Button events 1 and 0 are generated
root@imx6-tinyrexlite:~# 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 ------------
Alternative test
Input: Press the USER button
Output: Button events 1 and 0 are generated
root@imx6-tinyrexlite:~# 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 (Jan 19 2016 - 20:37:48) CPU: Freescale i.MX6SOLO rev1.1 at 792 MHz Reset cause: POR Board: MX6 TinyRex - lite 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
CAN
Input: None
Output: Device driver is available
root@imx6-tinyrexlite:~# ip addr show dev can0
2: can0: <NOARP,ECHO> mtu 16 qdisc noop state DOWN group default qlen 10
link/can
Input: Connect a pair of iMX6 TinyRex Development boards and a couple of dedicated CAN evaluation modules
Output: Boards communicate between each other. Sent messages are received successfully
Board 1 (receiver) commands and outputs:
root@imx6-tinyrexlite:~# ip link set can0 type can bitrate 1000000 root@imx6-tinyrexlite:~# ip link set can0 up flexcan 2090000.flexcan can0: writing ctrl=0x01232054 root@imx6-tinyrexlite:~# candump can0 & [1] 833 root@imx6-tinyrexlite:~# can0 123 [4] DE AD BE EF
Board 2 (transmitter and receiver) commands and outputs:
root@imx6-tinyrexlite:~# ip link set can0 type can bitrate 1000000 root@imx6-tinyrexlite:~# ip link set can0 up flexcan 2090000.flexcan can0: writing ctrl=0x01232054 root@imx6-tinyrexlite:~# candump can0 & [1] 847 root@imx6-tinyrexlite:~# cansend can0 123#DEADBEEF root@imx6-tinyrexlite:~# can0 123 [4] DE AD BE EF
HDMI Output
Input: Connect LCD monitor to the base board
Output: Desktop UI is displayed correctly
I2C
Input: Scan I2C bus 0
Output: Available devices:
- HDMI Output EDID (0x50)
root@imx6-tinyrexlite:~# 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 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
Input: Scan I2C bus 1
Output: The bus is reserved for external use
root@imx6-tinyrexlite:~# i2cdetect -y 1
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: Scan I2C bus 2
Output: The bus is reserved for external use
root@imx6-tinyrexlite:~# 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: -- -- -- -- -- -- -- --
Altarnative test
Input: List I2C bus 0, 1 and 2
Output: Available devices are displayed
root@imx6-tinyrexlite:~# ls /sys/bus/i2c/devices/i2c-0 | grep ^[0] 0-0050 0-0056 0-0057 root@imx6-tinyrexlite:~# ls /sys/bus/i2c/devices/i2c-1 | grep ^[1] root@imx6-tinyrexlite:~# 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-tinyrexlite:~# echo -n "none" > /sys/devices/soc0/leds*/leds/module-led/trigger root@imx6-tinyrexlite:~# echo -n "1" > /sys/devices/soc0/leds*/leds/module-led/brightness root@imx6-tinyrexlite:~# echo -n "0" > /sys/devices/soc0/leds*/leds/module-led/brightness root@imx6-tinyrexlite:~# echo -n "heartbeat" > /sys/devices/soc0/leds*/leds/module-led/trigger
DDR memory
Input: None
Output: Memory test passes without any errors
root@imx6-tinyrexlite:~# 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 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-tinyrexlite:~# 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-tinyrexlite:~# 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-tinyrexlite:~# rfkill unblock wlan
root@imx6-tinyrexlite:~# ip link set wlan0 up
IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
root@imx6-tinyrexlite:~# 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-tinyrexlite:~# ip link set wlan0 up
IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
root@imx6-tinyrexlite:~# 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
SD card
Input: SD card is plugged in
Output: Files stored on SD card are listed
root@imx6-tinyrexlite:~# dmesg | grep mmc mmc0: new high speed SD card at address aaaa mmcblk1: mmc0:aaaa SU02G 1.84 GiB mmcblk1: p1 root@imx6-tinyrexlite:~# mount /dev/mmcblk1p1 /media/ root@imx6-tinyrexlite:~# 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-tinyrexlite:~# echo -n "spi0.0" > /sys/bus/spi/drivers/m25p80/unbind root@imx6-tinyrexlite:~# 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-tinyrexlite:~# 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-tinyrexlite:~#
Input: Put module into suspend state (standby state). Wait 10s and then press USER button
Output: Module wakes up
root@imx6-tinyrexlite:~# 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-tinyrexlite:~#
Input: Set RTC wakeup event after 10s and put module into suspend state (standby state)
Output: Module wakes up by itself
root@imx6-tinyrexlite:~# 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-tinyrexlite:~#
UART serial console
Input: Connect USB to UART cable into the base board connector and open serial console with baud rate 115200 8n1
Output: The board is controlled and responsive to serial terminal commands
root@imx6-tinyrexlite:~# uname -a Linux imx6-tinyrexlite 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-tinyrexlite:~# 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-tinyrexlite:~# 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-tinyrexlite:~# rm -f file.txt /run/media/sda1/file.txt root@imx6-tinyrexlite:~# 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-tinyrexlite:~# cp file.txt /run/media/sda1/ root@imx6-tinyrexlite:~# md5sum file.txt /run/media/sda1/file.txt b8e8141b61813fcc08a6164833729e3b file.txt b8e8141b61813fcc08a6164833729e3b /run/media/sda1/file.txt root@imx6-tinyrexlite:~# rm file.txt /run/media/sda1/file.txt
USB OTG
Input: Load USB serial gadget driver and connect base board 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-tinyrexlite:~# modprobe -i g_serial g_serial gadget: Gadget Serial v2.4 g_serial gadget: g_serial ready root@imx6-tinyrexlite:~# 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) ...