Segger J-Link User Manual page 150

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Then J-Link / J-Trace has to be selected as debugger. To select J-Link / J-Trace as
debugger simply choose J-Link / J-Trace from the list box which can be found at
Project->Options for Target->Debug.
To use J-Link ARM FlashDL the J-Link flashloader has to be selected (the FlashBP
feature can also be used when J-Link flashloader is disabled). To enable the J-Link
flashloader J-Link / J-Trace at Project->Options for Target->Utilities has to be
selected.
If you use the MDK project for the first time, the J-Link ARM FlashDL and FlashBPs
settings are configured to Auto, which is the default value. For more information
about different configurations for J-Link ARM FlashDL and FlashBPs please refer to
chapter Settings on page 115. Now you can start the debug session. If you run this
project for the first time a settings file is created in which the configuration of J-Link
ARM FlashDL and FlashBPs is saved. This settings file is created for every project
configuration (e.g. Debug_RAM, Debug_FLASH), so you can save different J-Link
ARM FlashDL and FlashBP configurations for different project configurations. When
the debug session starts, you should see the selected target in the General tab of
J-Link / J-Trace (UM08001)
CHAPTER 6
© 2004-2011 SEGGER Microcontroller GmbH & Co. KG
Flash download and flash breakpoints