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ARTY A7 problem Olimex ARM-USB-TINY-H


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I'm a new user about arty a7 borad ,referring to the demo_gpio program(https://github.com/SI-RISCV/e200_opensource),am trying to run this on Artix-7 35T Arty board but getting errors in uploading program.

Licensed under GNU GPL v2
For bug reports, read
   http://openocd.org/doc/doxygen/bugs.html
adapter speed: 1000 kHz
Info : auto-selecting first available session transport "jtag". To override use 'transport select <transport>'.
Info : clock speed 1000 kHz
Error: JTAG scan chain interrogation failed: all ones
Error: Check JTAG interface, timings, target power, etc.
Error: Trying to use configured scan chain anyway...
Error: riscv.cpu: IR capture error; saw 0x1f not 0x01
Warn : Bypassing JTAG setup events due to errors
Error: Unsupported DTM version: 15
Info : Listening on port 3333 for gdb connections
Error: Target not examined yet

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