If you hook-up JLink to BeagleBoard and execute JLink commander, then you probably get the following error:
****** Error: DBEGN is not asserted.
And fail to recognise the target. This is because TI OMAP3530 needs a special setup sequence for JLink to connect, which is controlled by JLink script file (Default.JLinkScript)
Find the script file:
$JLINK_INST_DIR$\Samples\JLink\Scripts\ScriptBeagleBoard...
Copy it to the base directory(Windows) or the current directory(Linux) and rename it to
Default.JLinkScript
Then you can successfully connect to the board.