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7.4
J-Link firmware
The heart of J-Link is a microcontroller. The firmware is the software executed by the
microcontroller inside of the J-Link. The J-Link firmware sometimes needs to be
updated. This firmware update is performed automatically if necessary by the
JLinkCF.dll .
7.4.1
Firmware update
Every time you connect to J-Link, JLinkCF.dll checks if its embedded firmware is
newer than the one used in J-Link. The DLL will then update the firmware automati-
cally. This process takes less than 3 seconds and does not require a reboot.
It is recommended that you always use the latest version of JLinkCF.dll .
In the screenshot:
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?
7.4.2
The red box identifies the new firmware
The green box identifies the old firmware which has been replaced
Invalidating the firmware
Downdating J-Link is not performed automatically through an old JLinkCF.dll . J-
Link will continue using its current, newer firmware when using older versions of the
JLinkCF.dll .
Note:
Downdating J-Link is not recommended, you do it at your own risk.
Note: Note also that the firmware embedded in older versions of JLinkCF.dll
might not execute properly with newer hardware versions.
To downdate J-Link, you need to invalidate the current J-Link firmware, using the
command exec InvalidateFW .
In the screenshot, the red box contains information about the formerly used J-Link
firmware version.
J-Link ColdFire BDM 26 (UM08009)
? 2004-2009 SEGGER Microcontroller GmbH & Co. KG
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