EK-RA6M2 SCIBOOT模式识别不到串口

这边用EK-RA6M2 demo板突然不能仿真。用jflash连接提示如下图所示：

具体信息如下：

Connecting ...
- Connecting via USB to probe/ programmer device 0
- Probe/ Programmer firmware: J-Link OB-S124 compiled Feb 2 2021 16:57:21
- Device "R7FA6M2AF" selected.
- Target interface speed: 2000 kHz (Fixed)
- VTarget = 3.300V
- Found SW-DP with ID 0x5BA02477
- Found SW-DP with ID 0x5BA02477
- DPIDR: 0x5BA02477
- 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]: APB-AP (IDR: 0x44770002)
- 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
- ROMTbl[0][6]: E0042000, CID: B105900D, PID: 002BB908 CSTF
- ROMTbl[0][7]: E0043000, CID: B105900D, PID: 001BB961 TMC
- ROMTbl[0][8]: E0044000, CID: B105F00D, PID: 001BB101 TSG
- Executing init sequence ...
- Initialized successfully
- Target interface speed: 2000 kHz (Fixed)
- ERROR: Could not detect CPU clock speed. Verification of test code downloaded into RAM failed.
- ERROR: Failed to measure CPU clock frequency
- ERROR: Failed to connect.
Could not determine CPU clock frequency.

这边改为SCI BOOT模式 连接不能识别到串口。请问有遇到过类似的情况吗？