Having got SWO viewer working sweetly, I have one additional question: what does jLinkSWOViewerCL (V632a) need to form a line ending? I ask because I am sending a string with a CR and LF ending but in SWO Viewer the CR and LF characters effectively disappear. So in jLinkSWOViewerCL, sending printf("Hello world %d.\r\n"), x) in a loop, I get:

Hello world 0.Hello world 1.Hello world 2.

...while in GDB (which I think is interpreting both CR and LF as line endings) I get:

Hello world 0.

Hello world 1.

Hello world 2.

What do I need to send to get line endings to appear in jLinkSWOViewerCL?

Oh, no, don't worry about this, it was a bug in the patch in the target code, all is working as intended.