用的是ti的评估版evm6670，报错信息如下：
IcePick_D: Error connecting to the target:
(Error -503 @ 0x0) The user selected phase-one auto-range frequency failed the scan-path test.
The utility or debugger requested the JTAG controller and cable, that generate the JTAG clock, to use a user selected feature or algorithm.
The built-in scan-path reliability test has failed.
This indicates that the JTAG controller and its cable cannot reliably communicate with the target system using that feature or algorithm.
Try using the legacy frequency or a known good specific frequency. (Emulation package 5.0.872.0)
