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1. #UNPLACED SECTIONS SEGGER EMBEDDED STUDIO ZIP FILE#
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Segger J-Link firmware has no MSD Bootloader implemented.In general mbed is expected to be slow as it is using USB HID class for download/debugging which is not fast. With the MSD bootloader it took 6 secondes (20 KByte/second). Loading smaller applications worked, but would not be comparable (mbed CMSIS-DAP needed 1.7 seconds for launching a 1.5 KByte application). The mbed CMSIS-DAP failed for my test application (120 KByte code) and locked constantly my board. Measured the time from the start of ‘debug’ until reaching main().As this firmware is (not yet) officially available, I have not compared it in the table below.ĬodeWarrior, Eclipse, Keil, IAR, KDS, … (Segger J-Link) 💡 P&E has provided a OpenSDAv2 firmware at FTF for hands-on-classes using the FRDM-K64F board. I have used Eclipse with Segger GDB and OpenOCD with CMSIS-DAP. There is now a new mbed CMSIS-DAP firmware 0202 available which seems to solve these issues: īelow is a comparison of the two debug options for the FRDM-K64F board with OpenSDAv2. ❗ The mbed CMSIS-DAP firmware so far was not very robust (even caused my FRDM-K64F board to be blocked several times, see “ Recovering FRDM-K64F mbed Board“). With the availability of the Segger J-Link firmware for OpenSDAv2, there is a true alternative to the mbed CMSIS-DAP firmware. With this, the board looks like a normal Segger J-Link for the debugger. Power the board withtheOpenSDAv2 USB connector while having the reset button pressed.

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Unpack the content of the zip file (JLink_OpenSDA_V2.bin).NOTE that you need the V2.0 (V2) for K64F, *not* the V2.1.!

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Go to and scroll to the end of the page with the OpenSDAv2 section and download the firmware.❗ Update: the latest USBDM ( ) has suppport for OpenSDAv2 included too. Now there is an alternative: The Segger J-Link OpenSDAv2 firmware 🙂 Up to now the only available OpenSDAv2 firmware is the mbed CMSIS-DAP one (see “ mbed CMSIS-DAP“). Even more, as the OpenSDAv1 accepts S19 files, but the OpenSDAv2 bootloader only accepts binary files (see “ Binary Files for the mbed Bootloader with Eclipse and GNU ARM Eclipse Plugins“). As the bootloader is different, and the memory mapping too, the OpenSDAv1 applications do not run on top of the mbed bootloader. The second version (OpenSDAv2) is present on the FRDM-K64F board, and is based on the mbed bootloader and is open source. a data logger or something else), the main purpose is running a debug firmware so a debugger can debug the target processor. While it is possible to have any kind of applications running on top of the bootloader (e.g. P&E OpenSDA, Segger OpenSDA or the ARM CMSIS-DAP). On top of this bootloader I can load different *.SDA firmware (e.g. The first version ( OpenSDAv1) bootloader has been developed by P&E, and is not open source. The firmware/application on top of the bootloader.