nrf5340-pdk segger download error: CPU_REG_SET(): Register 0 is already marked as valid.

[navigator]

I loaded up the zephyr sample blinky example, compiled ok, and went to download to the nrf5340-pdk...

I got the following error dialog plus some more misc. errors (see output attachment).   If I compile the same zephyr blinky example for the nrf52840-dk, it downloads fine, with no errors -- same pc and toolchain install.  I have included outputs from both the nrf5340-pdk and nrf52840-dk.   I am using ncs v1.2.0

I emailed Segger about this but they said JLINK-OB support would have to come from Nordic in this case. 

Thanks for any help on this.   The code does seem to download, but the error dialog is there each time I hit download.  I did try power cycling everything and observed the same results.

Fullscreen 7674.nrf5340-pdk--ERROR.txt Download

Connecting ‘J-Link’ using ‘USB’
Connecting to target using SWD
Loaded C:/sandbox/arm_segger_embedded_studio_v442a_win_x64_nordic/bin/JLink_x64.dll
Firmware Version: J-Link OB-K22-NordicSemi compiled Jan 21 2020 17:33:01
DLL Version: 6.62a
Hardware Version: V1.00
Target Voltage: 3.300
Device "NRF5340_XXAA_APP" selected.
ConfigTargetSettings() start
ConfigTargetSettings() end
Found SW-DP with ID 0x6BA02477
DPIDR: 0x6BA02477
AP map detection skipped. Manually configured AP map found.
AP[0]: AHB-AP (IDR: Not set)
AP[1]: AHB-AP (IDR: Not set)
AP[2]: MEM-AP (IDR: Not set)
AP[3]: MEM-AP (IDR: Not set)
AP[0]: Core found
AP[0]: AHB-AP ROM base: 0xE00FF000
CPUID register: 0x410FD214. Implementer code: 0x41 (ARM)
Found Cortex-M33 r0p4, Little endian.
FPUnit: 8 code (BP) slots and 0 literal slots
Security extension: implemented
Secure debug: enabled
CoreSight components:
ROMTbl[0] @ E00FF000
ROMTbl[0][0]: E000E000, CID: B105900D, PID: 000BBD21 Cortex-M33
ROMTbl[0][1]: E0001000, CID: B105900D, PID: 000BBD21 DWT
ROMTbl[0][2]: E0002000, CID: B105900D, PID: 000BBD21 FPB
ROMTbl[0][3]: E0000000, CID: B105900D, PID: 000BBD21 ITM
ROMTbl[0][5]: E0041000, CID: B105900D, PID: 002BBD21 ETM
ROMTbl[0][6]: E0042000, CID: B105900D, PID: 000BBD21 CTI
Identifying
Device ID: 0x6BA02477
Preparing target for download
Executing Reset script TargetInterface.resetAndStop()
Reset: Halt core after reset via DEMCR.VC_CORERESET.
Reset: Reset device via AIRCR.SYSRESETREQ.
Reading register 29 failed: Unspecified error
Reading register 30 failed: Unspecified error
Reading register 31 failed: Unspecified error
Downloading ‘zephyr.elf’ to J-Link
Programming 12.0 KB of addresses 00000000 — 00003013
Programming 0.1 KB of addresses 00003014 — 000030bf
J-Link: Flash download: Bank 1 @ 0x00000000: 1 range affected (4096 bytes)
J-Link: Flash download: Total time needed: 0.193s (Prepare: 0.036s, Compare: 0.012s, Erase: 0.088s, Program: 0.045s, Verify: 0.001s, Restore: 0.008s)
Download successful

Fullscreen 8171.nrf52840-dk -- no error.txt Download

Connecting ‘J-Link’ using ‘USB’
Connecting to target using SWD
Loaded C:/sandbox/arm_segger_embedded_studio_v442a_win_x64_nordic/bin/JLink_x64.dll
Firmware Version: J-Link OB-SAM3U128-V2-NordicSemi compiled Jan 21 2020 17:30:48
DLL Version: 6.62a
Hardware Version: V1.00
Target Voltage: 3.300
Device "NRF52840_XXAA" selected.
InitTarget() start
InitTarget() end
Found SW-DP with ID 0x2BA01477
DPIDR: 0x2BA01477
Scanning AP map to find all available APs
AP[2]: Stopped AP scan as end of AP map has been reached
AP[0]: AHB-AP (IDR: 0x24770011)
AP[1]: JTAG-AP (IDR: 0x02880000)
Iterating through AP map to find AHB-AP to use
AP[0]: Core found
AP[0]: AHB-AP ROM base: 0xE00FF000
CPUID register: 0x410FC241. Implementer code: 0x41 (ARM)
Found Cortex-M4 r0p1, Little endian.
FPUnit: 6 code (BP) slots and 2 literal slots
CoreSight components:
ROMTbl[0] @ E00FF000
ROMTbl[0][0]: E000E000, CID: B105E00D, PID: 000BB00C SCS-M7
ROMTbl[0][1]: E0001000, CID: B105E00D, PID: 003BB002 DWT
ROMTbl[0][2]: E0002000, CID: B105E00D, PID: 002BB003 FPB
ROMTbl[0][3]: E0000000, CID: B105E00D, PID: 003BB001 ITM
ROMTbl[0][4]: E0040000, CID: B105900D, PID: 000BB9A1 TPIU
ROMTbl[0][5]: E0041000, CID: B105900D, PID: 000BB925 ETM
Preparing target for download
Executing Reset script TargetInterface.resetAndStop()
Reset: Halt core after reset via DEMCR.VC_CORERESET.
Reset: Reset device via AIRCR.SYSRESETREQ.
Downloading ‘zephyr.elf’ to J-Link
Programming 14.1 KB of addresses 00000000 — 0000386f
Programming 0.3 KB of addresses 00003870 — 000039f3
J-Link: Flash download: Bank 0 @ 0x00000000: 1 range affected (4096 bytes)
J-Link: Flash download: Total time needed: 0.543s (Prepare: 0.353s, Compare: 0.016s, Erase: 0.085s, Program: 0.077s, Verify: 0.000s, Restore: 0.009s)
Download successful

[navigator]

Ok, I found that this has been reported previously...see https://devzone.nordicsemi.com/f/nordic-q-a/57977/nrf5340-debug-issues

Question...the recommendation given was to use an older SES Nordic version which did not have the problems.  So where can I find the Nordic specific version v4.30c....I can't seem to find it on Segger's site....And the getting started guide for ncs only points to the latest version 4.42a.

Would be really nice if the older Nordic SES versions are archived somewhere in similar fashion to how the Segger official SES versions are handled.

Anyone care to offer up a download link for 4.30c SES (Nordic edition)?  Pretty please 

[Amanda Hsieh]

Hi, 

Could you try the SES latest version 4.42a and the setting of the core type in SES project settings? Please kindly let me know it can work or not. Thanks. 

-Amanda H.

[navigator]

Hi Amanda... It was set to "None", so I set it to "Cortex-M33", and it started working.  I set it back to "None" and it stopped working.  So that looks like a solution!

Thanks!!

[navigator]

Just in case folks want to know....This issue is fixed in SES v4.52 (Nordic edition), the fields are populated properly automatically.