arm-none-eabi-gdb my_firmware.elf (gdb) target remote localhost:3333 (gdb) monitor reset halt (gdb) load (gdb) continue | Feature | EJTag Tiny Tools | Segger J-Link | ST-Link | OpenOCD | | :--- | :--- | :--- | :--- | :--- | | Price | Free / Open Source | $100 - $1000+ | Free (with STM32 boards) | Free | | Multi-Arch Support | Excellent (ARM, MIPS, RISC-V) | Excellent (primarily ARM) | Poor (STM32 only) | Good | | Ease of Use | Moderate (CLI-focused) | Excellent (GUI + CLI) | Good (GUI via CubeProgrammer) | Steep learning curve | | Flash Speed (Avg) | ~150 KB/s | ~250 KB/s | ~50 KB/s | ~100 KB/s | | Scripting | Built-in CLI | Via Python API | Limited | Yes (TCL scripts) | | Real-time tracing | Basic (SWO) | Advanced (ETB, ETM) | Basic | Basic | Common Use Cases for EJTag Tiny Tools Software 1. Booting "Bricked" Devices When a bad firmware flash disables the bootloader, EJTag Tiny Tools can bypass the CPU’s internal boot ROM using JTAG. By holding the CPU in reset and writing SRAM directly, you can revive a board that standard DFU (Device Firmware Update) can’t touch. 2. Production Line Testing Manufacturers use the command-line tools to flash and test hundreds of boards automatically. A single Python script can cycle through probes, verify serial numbers, and log pass/fail rates. 3. Reverse Engineering Legacy Systems Because EJTag Tiny Tools support older MIPS and ARM926EJ-S cores, they are invaluable for reviving discontinued industrial controllers or automotive ECUs where modern debuggers no longer work. Troubleshooting Common Issues Even robust software can hit snags. Here are typical problems and solutions:
Download the tools, assemble a $20 EJTag Tiny probe, and take full command of your hardware—one JTAG clock cycle at a time. Have you used EJTag Tiny Tools on a unique platform? Share your experiences in the comments below! ejtag tiny tools software
Whether you are reviving a bricked industrial PC, debugging a multi-core RISC-V AI accelerator, or simply want to break free from vendor lock-in, the EJTag Tiny Tools software suite provides the keys to the kingdom. arm-none-eabi-gdb my_firmware
target remote localhost:3333 interface jtag jtag newtap mycpu tap -irlen 4 -expected-id 0x4ba00477 set CHIPNAME STM32F407 init reset init Then launch the GDB server: debugging a multi-core RISC-V AI accelerator
ejtag-gdbserver --config my_board.cfg --port 3333 In another terminal:
