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21.3.5 MicroBlaze

The MicroBlaze is a soft-core processor supported on various Xilinx FPGAs, such as Spartan or Virtex series. Boards with these processors usually have JTAG ports which connect to a host system running the Xilinx Embedded Development Kit (EDK) or Software Development Kit (SDK). This host system is used to download the configuration bitstream to the target FPGA. The Xilinx Microprocessor Debugger (XMD) program communicates with the target board using the JTAG interface and presents a gdbserver interface to the board. By default xmd uses port 1234. (While it is possible to change this default port, it requires the use of undocumented xmd commands. Contact Xilinx support if you need to do this.)

Use these GDB commands to connect to the MicroBlaze target processor.

target remote :1234

Use this command to connect to the target if you are running GDB on the same system as xmd.

target remote xmd-host:1234

Use this command to connect to the target if it is connected to xmd running on a different system named xmd-host.


Use this command to download a program to the MicroBlaze target.

set debug microblaze n

Enable MicroBlaze-specific debugging messages if non-zero.

show debug microblaze n

Show MicroBlaze-specific debugging level.