General procedure

• Make sure your J-Link is working as expected. See the troubleshooting section in the J-Link manual.
• Ensure that the target hardware matches the project file settings. Pay special attention to the following aspects:
  - Init sequence
  - Clock speed
  - RAM address
  - Flash base address
  - MCU / Flash chip
  - Flash organization
• Try to program your target device using a sample project file if available. J-Flash ships with an extensive number of project files for many target boards. See section iiSample Projectsl. on page 14 for a complete list of project files.
• The JTAG clock frequency depends on several factors, e.g. cable length, target board etc. Try setting the frequency to lower or higher values accordingly.
• Make sure the flash memory is unlocked before programming or erasing.

Typical problems

Failed to connect

Meaning:
This error message is shown if any error occurs during the connection process.
Remedy:
First of all, make sure the target is actually connected to J-Link. Verify the correctness of the init sequence, check the JTAG speed, and ensure the correct flash type is selected.

Programming / Erasing failed

Meaning:
The flash memory sector may be locked and programming or erasing the respective memory section fails therefore.
Remedy:
Make sure the memory sector is unlocked before programming or erasing. J-Flash provides a dedicated menu item for unlocking flash memory.

Timeout errors during programming

Meaning:
A timeout occurs if the target is too slow during DCC communication or the target flash memory is too slow during programming.
Remedy:
Using smaller RAM block sizes may fix this problem.

Blank check failed

Meaning:
The target memory was not empty during blank check.
Remedy:
Erase target memory.

RAM check failed

Meaning:
No RAM found at the specified RAM location.
Remedy:
Remedy: Make sure a correct RAM address is specified in the project settings. See section "ARM Settings" on page 22 in the J-Flash manual.

Unexpected core ID

Meaning:
The specified CPU core ID does not match with the one read from the target CPU.
Remedy:
Ensure the specified core ID is correct for the used target CPU. See section "ARM Settings" on page 22 in the J-Flash manual for information about setting the core ID.

Unsupported flash type / bus width

Meaning:
The target flash memory or the bus organization is not yet supported.
Remedy:
Inform us about the flash type you want to use. SEGGER is constantly adding support for new flash memory devices.

No matching RAMCode

Meaning:
There is no programming algorithm available for the selected target memory type.
Remedy:
Inform us about the flash type you want to use. SEGGER is constantly adding support for new flash memory devices.