When I try to read my LPC55S69 flash memory with JFlash V7.66b and a J-Link I receive the following error: 'Failed to read back target memory'. Nevertheless, there's no problem when I use J-Mem V7.66b and the same J-Link. This is what the log file says:


Connecting ...

- Connecting via USB to probe/ programmer device 0

- Probe/ Programmer firmware: J-Link V9 compiled May 7 2021 16:26:12

- Device "LPC55S69_M33_0" selected.

- ConfigTargetSettings() start

- Disabling flash programming optimizations: Compare, SkipBlankDataOnProg

- ConfigTargetSettings() end

- InitTarget() start

- InitTarget() end

- Found SW-DP with ID 0x6BA02477

- DPIDR: 0x6BA02477

- CoreSight SoC-400 or earlier

- Scanning AP map to find all available APs

- AP[3]: Stopped AP scan as end of AP map has been reached

- AP[0]: AHB-AP (IDR: 0x84770001)

- AP[1]: AHB-AP (IDR: 0x84770001)

- AP[2]: JTAG-AP (IDR: 0x002A0000)

- Iterating through AP map to find AHB-AP to use

- AP[0]: Core found

- AP[0]: AHB-AP ROM base: 0xE00FE000

- CPUID register: 0x410FD213. Implementer code: 0x41 (ARM)

- Feature set: Mainline

- Found Cortex-M33 r0p3, Little endian.

- FPUnit: 8 code (BP) slots and 0 literal slots

- Security extension: implemented

- Secure debug: enabled

- CoreSight components:

- ROMTbl[0] @ E00FE000

- [0][0]: E00FF000 CID B105100D PID 000BB4C9 ROM Table

- ROMTbl[1] @ E00FF000

- [1][0]: E000E000 CID B105900D PID 000BBD21 DEVARCH 47702A04 DEVTYPE 00 Cortex-M33

- [1][1]: E0001000 CID B105900D PID 000BBD21 DEVARCH 47701A02 DEVTYPE 00 DWT

- [1][2]: E0002000 CID B105900D PID 000BBD21 DEVARCH 47701A03 DEVTYPE 00 FPB

- [1][3]: E0000000 CID B105900D PID 000BBD21 DEVARCH 47701A01 DEVTYPE 43 ITM

- [0][1]: E0040000 CID B105900D PID 000BBD21 DEVARCH 00000000 DEVTYPE 11 Cortex-M33

- SetupTarget() start

- Disabling flash programming optimizations: Compare, SkipBlankDataOnProg

- SetupTarget() end

- Target interface speed: 2000 kHz (Auto)

- VTarget = 3.329V

- ConfigTargetSettings() start

- Disabling flash programming optimizations: Compare, SkipBlankDataOnProg

- ConfigTargetSettings() end

- InitTarget() start

- InitTarget() end

- Found SW-DP with ID 0x6BA02477

- DPIDR: 0x6BA02477

- CoreSight SoC-400 or earlier

- AP map detection skipped. Manually configured AP map found.

- AP[0]: AHB-AP (IDR: Not set)

- AP[0]: Core found

- AP[0]: AHB-AP ROM base: 0xE00FE000

- CPUID register: 0x410FD213. Implementer code: 0x41 (ARM)

- Feature set: Mainline

- Found Cortex-M33 r0p3, Little endian.

- FPUnit: 8 code (BP) slots and 0 literal slots

- Security extension: implemented

- Secure debug: enabled

- CoreSight components:

- ROMTbl[0] @ E00FE000

- [0][0]: E00FF000 CID B105100D PID 000BB4C9 ROM Table

- ROMTbl[1] @ E00FF000

- [1][0]: E000E000 CID B105900D PID 000BBD21 DEVARCH 47702A04 DEVTYPE 00 Cortex-M33

- [1][1]: E0001000 CID B105900D PID 000BBD21 DEVARCH 47701A02 DEVTYPE 00 DWT

- [1][2]: E0002000 CID B105900D PID 000BBD21 DEVARCH 47701A03 DEVTYPE 00 FPB

- [1][3]: E0000000 CID B105900D PID 000BBD21 DEVARCH 47701A01 DEVTYPE 43 ITM

- [0][1]: E0040000 CID B105900D PID 000BBD21 DEVARCH 00000000 DEVTYPE 11 Cortex-M33

- SetupTarget() start

- Disabling flash programming optimizations: Compare, SkipBlankDataOnProg

- SetupTarget() end

- Executing init sequence ...

- Executing Reset (0, 0 ms)

- ResetTarget() start

- Reset strategy selected in debugger ignored. Performing device specific reset.

- Reset handler addr: 0x00003974

- ResetTarget() end

- AfterResetTarget() start

- AfterResetTarget() end

- Initialized successfully

- Target interface speed: 2000 kHz (Auto)

- Found 1 JTAG device. Core ID: 0x6BA02477 (None)

- Connected successfully

Reading target memory (0x00000000 - 0x0009DDFF) ...

- Start of preparing flash programming

- End of preparing flash programming

- ERROR: Failed to read memory (0x20000 bytes @ address 0x00000000)

- Start of restoring

- End of restoring

- ERROR: Failed to read back target memory

Disconnecting ...

- Disconnected