Cortex-A7 不能连接

`SEGGER J-Link Commander V4.98c ('?' for help)
Compiled Apr 23 2015 20:22:10
DLL version V4.98c, compiled Apr 23 2015 20:21:50
Firmware: J-Link V9 compiled Apr 21 2017 11:08:06
Hardware: V9.40
S/N: 59410329
Feature(s): RDI, GDB, FlashDL, FlashBP, JFlash
VTarget = 1.811V
Info: TotalIRLen = 12, IRPrint = 0x0011
Info: ARM AP[0]: 0x64770001, AHB-AP
Info: ARM AP[1]: 0x44770002, APB-AP
Info: ROMTbl 0 [0]: 00040003, CID: B105100D, PID:00-00080000 ROM Table
Info: ROMTbl 1 [0]: 00010003, CID: B105900D, PID:04-002BB908 CSTF
Info: ROMTbl 1 [1]: 00020003, CID: B105100D, PID:04-000BB4A7 ROM Table
Info: ROMTbl 2 [0]: 00010003, CID: B105900D, PID:04-005BBC07 Cortex-A7
Info: Found Cortex-A7 r0p5
Info: 6 code breakpoints, 4 data breakpoints
Info: Debug architecture ARMv7.1
Info: Data endian: little
Info: Main ID register: 0x410FC075
Info: I-Cache L1: 32 KB, 512 Sets, 32 Bytes/Line, 2-Way
Info: D-Cache L1: 32 KB, 128 Sets, 64 Bytes/Line, 4-Way
Info: Unified-Cache L2: 512 KB, 1024 Sets, 64 Bytes/Line, 8-Way
Info: System control register:
Info:   Instruction endian: little
Info:   Level-1 instruction cache disabled
Info:   Level-1 data cache disabled
Info:   MMU disabled
Info:   Branch prediction enabled
Found 2 JTAG devices, Total IRLen = 12:
#0 Id: 0x5BA00477, IRLen: 04, IRPrint: 0x1, CoreSight JTAG-DP (ARM)
#1 Id: 0x16B0001D, IRLen: 05, IRPrint: 0x1, PowerPC JTAGC-TAP
Cortex-A7 identified.
Target interface speed: 100 kHz
J-Link>

调试飞思卡尔的CPU, JTAG可以发现内核但是连接的时候总是失败，请教大神这是什么原因，上电和复位以及是时钟信息测量都没问问题。谢谢！
`

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