SmartSnippets Toolbox won't program SPI Flash

Hi, folks,

I have a custom board that we've designed and been checking out. I can boot the DA14531 to RAM using either Keil SWD via my Segger J-Link or SmartSnippets Toolbox 1-Wire UART. It works fine.

The problem is that I can't get the SmartSnippets Toolbox v5.0.14.3080 to program the SPI flash. It fails with "[ERROR General @21-01-24 22:39:22] No known chip found while opening JLink connection. Terminating proccess...". This makes no sense as the chip programs via Keil SWD just fine.

I do note that the Max Clock is a bit ... fiddly. I get an IDCODE reliably at 500KHz, but never at 1MHz. I find that the IDCODE sometimes works at 2MHz and always works at 5MHz (that's kind of weird).

Edit: I have verified this behavior on 2 other boards. Keil is fine. UART is fine. SmartSnippets is not.

Presumably, the problem is that SmartSnippets Toolbox isn't setting the Max Clock correctly. How do I set this?

Error log below.

Thanks.

[INFO General @21-01-24 22:39:22] Found SW-DP with ID 0x0BC11477 [INFO General @21-01-24 22:39:22] Scanning AP map to find all available APs [INFO General @21-01-24 22:39:22] AP[1]: Stopped AP scan as end of AP map has been reached [INFO General @21-01-24 22:39:22] AP[0]: AHB-AP (IDR: 0x04770031) [INFO General @21-01-24 22:39:22] Iterating through AP map to find AHB-AP to use [INFO General @21-01-24 22:39:22] AP[0]: Core found [INFO General @21-01-24 22:39:22] AP[0]: AHB-AP ROM base: 0xE00FF000 [INFO General @21-01-24 22:39:22] CPUID register: 0x410CC601. Implementer code: 0x41 (ARM) [INFO General @21-01-24 22:39:22] Found Cortex-M0 r0p1, Little endian. [INFO General @21-01-24 22:39:22] FPUnit: 4 code (BP) slots and 0 literal slots [INFO General @21-01-24 22:39:22] CoreSight components: [INFO General @21-01-24 22:39:22] ROMTbl[0] @ E00FF000 [INFO General @21-01-24 22:39:22] ROMTbl[0][0]: E000E000, CID: B105E00D, PID: 000BB008 SCS [INFO General @21-01-24 22:39:22] ROMTbl[0][1]: E0001000, CID: B105E00D, PID: 000BB00A DWT [INFO General @21-01-24 22:39:22] ROMTbl[0][2]: E0002000, CID: B105E00D, PID: 000BB00B FPB [ERROR General @21-01-24 22:39:22] No known chip found while opening JLink connection. Terminating proccess... [ERROR SPI Flash @21-01-24 22:39:22] Failed downloading firmware file to the board.