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pulpissimo JTAG issue with NEXYS A7 #445

@PengchengYang-xdu

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@PengchengYang-xdu

Hi, guys. I encountered an issue with JTAG, it seemed normal when compiling and downloading bitstream. However, the JTAG just doesn't work properly.
In addition, I use boot_zforth() instead of boot_jtag_openocd() before, system works properly, when i test uart, the baudrate have to be set to 57600, which is not the same with the design config(115200). Does this have anything to wo with the JTAG problem?
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