* JLink Info: Device "STM32F407ZG" selected (1024 KB flash, 128 KB RAM).

JLink info:
------------
DLL: V4.90 , compiled Jul 28 2014 10:35:20
Firmware: J-Link ARM V8 compiled Nov 28 2014 13:44:46
Hardware: V8.00
S/N : 304439649
Feature(s) : RDI,FlashDL,FlashBP,JFlash,GDBFULL

* JLink Info: Found SWD-DP with ID 0x2BA01477
* JLink Info: Found SWD-DP with ID 0x2BA01477
* JLink Info: Found Cortex-M4 r0p1, Little endian.
* JLink Info: FPUnit: 6 code (BP) slots and 2 literal slots
* JLink Info: TPIU fitted.
* JLink Info: ETM fitted.
ROMTableAddr = 0xE00FF003

Target info:
------------
Device: STM32F407ZG
VTarget = 2.866V
State of Pins:
TCK: 0, TDI: 1, TDO: 1, TMS: 1, TRES: 1, TRST: 1
Hardware-Breakpoints: 6
Software-Breakpoints: 8192
Watchpoints:          4
JTAG speed: 4000 kHz

***JLink Error: Could not start CPU core. (ErrorCode: -1)
**JLink Warning: T-bit of XPSR is 0 but should be 1. Changed to 1.
**JLink Warning: T-bit of XPSR is 0 but should be 1. Changed to 1.
Erase Failed!
Error: Flash Download failed  -  "Cortex-M4"
Flash Load finished at 23:19:50



有没有帮我看下怎么回事     串口可以下程序进去  应该不是锁住了吧   
JLINK也能读到芯片的信息  但是就是下载不进去