Assuming you have Olimex SAM7 series board with JTAG interface adapter. You can run and test Embox after few quite simple steps. Please, read it all before doing anything.

Get OpenOCD, free suite for On-Chip debuging. Source can be grabbed here, compiled version can be downloaded from

here, if you are on Windows
or preferably from your repositary, if you are on Linux box

Install OpenOCD in your preferable path, it can be added into the $PATH or %PATH% for convenience
On Windows download and install libusb
Only now you should connect JTAG and board, plug JTAG in PC, then drain power to board
OpenOCD have predefined configs for boards and interfaces. You should combine boards/olimex_sam7_ex256 with one in interfaces, that suite your JTAG adapter, in openocd.conf. Or you can use predefined one
In command line run

openocd openocd.conf

Now you have gdb-server compatible environment on your local machine on tcp port 3333. You can simply load firmware like

gdb build/base/bin/embox # provide elf file
(gdb) target remote-extended :3333
(gdb) load
(gdb) continue

or use Eclipse for doing that details here

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