Bus Pirate JTAG connections for OpenOCD

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BP-JTAG cable pinout

BP   - JTAG
VPU  - VTref(3v3)
GND  - GND
MOSI - TDI
MISO - TDO
CLK  - TCK
CS   - TMS 
N/A  - TRST
N/A  - RTCK
AUX  - SRST

For this cable to work you need in your buspirate.cfg

 buspirate_vreg 0          # turn off the voltage regulator
 buspirate_mode open-drain # open drain as we are working with pull up's
 buspirate_pullup 1        # turn pull up's on (VTref is connected to pull up's)
  • Note: # comments may not be allowed in the latest release

If you want to go with

 buspirate_mode normal
 buspirate_pullup 0

then don't connect VPU and Vtref.