In the FRDM-KL05Z user manual on page 7 "5.2.1 Debug Interface" there is a short description of how to use the OpenSDA debug interface with an external CPU. After making a board with a KL15 processor, i tried to connect it.
First i found a minor confusion in the Jumper J6 connections. The internal KL05 remains connected when you cut the trace below J6. In fact J6 operates on the external processor SWD_CLK. I had to cut another trace and solder a wire to the correct side of J6.
Now the SDA connection to the external processor seemed to work, but then i got a messagebox: "Error 17926. Target MCU mismatch. OpenSDA hardware only supports debugging the resident target processor..." How can we resolve this problem and debug the external KL15 board?
In the meantime i found Erich Styger's BLOG concerning the "Error 17926", more or less with the result that the 5.2.1 chapter was considered obsolete. They could not make it work.