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使用蜂鸟调试器，将RISC-V移植到自用FPGA上，可以发现接口，但是运行hello_world报错：
Nuclei OpenOCD, 64-bit Open On-Chip Debugger 0.10.0+dev-00036-gbfc178ffb (2021-02-01-06:41)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
Info : Using libusb driver
Info : clock speed 1000 kHz
Info : JTAG tap: riscv.cpu tap/device found: 0x1e200a6d (mfg: 0x536 (Nuclei System Technology Co.,Ltd.), part: 0xe200, ver: 0x1)
Error: Unsupported DTM version: 14
Info : Listening on port 3333 for gdb connections
Error: Target not examined yet
Error: Unsupported DTM version: 14
