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❯❯❯ JLinkGDBServer -device MKL17Z256xxx4 -if SWD -port 3333 -rtos /opt/SEGGER/JLink/GDBServer/RTOSPlugin_FreeRTOS.so -v
SEGGER J-Link GDB Server V6.12a Command Line Version

JLinkARM.dll V6.12a (DLL compiled Dec  2 2016 17:00:59)

WARNING: Unknown command line parameter -v found.
-----GDB Server start settings-----
GDBInit file:                  none
GDB Server Listening port:     3333
SWO raw output listening port: 2332
Terminal I/O port:             2333
Accept remote connection:      yes
Generate logfile:              off
Verify download:               off
Init regs on start:            off
Silent mode:                   off
Single run mode:               off
Target connection timeout:     0 ms
------J-Link related settings------
J-Link Host interface:         USB
J-Link script:                 none
J-Link settings file:          none
------Target related settings------
Target device:                 MKL17Z256xxx4
Target interface:              SWD
Target interface speed:        1000kHz
Target endian:                 little

Connecting to J-Link...
J-Link is connected.
Firmware: J-Link OB-SAM3U128-V2-NordicSemi compiled Nov 14 2016 16:58:29
Hardware: V1.00
S/N: 681547977
Checking target voltage...
Target voltage: 3.30 V
Listening on TCP/IP port 3333
Connecting to target...Connected to target
Waiting for GDB connection...Connected to 127.0.0.1
Reading all registers
Read 4 bytes @ address 0x0000546C (Data = 0x681B4B05)
Loading RTOS plugin: /opt/SEGGER/JLink/GDBServer/RTOSPlugin_FreeRTOS.so...
RTOS plugin load failed