Ejtag Tiny Tools Software

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How to Use Ejtag Tiny Tools Software for JTAG Programming

Ejtag Tiny Tools Software is a free and open source software package that allows you to work with JTAG-aware (IEEE 1149.1) hardware devices and boards through a JTAG adapter. JTAG stands for Joint Test Action Group, and it is a standard interface for testing and debugging integrated circuits. With Ejtag Tiny Tools Software, you can perform various tasks such as reading and writing flash memory, executing code, debugging firmware, and more.

In this article, we will show you how to use Ejtag Tiny Tools Software for JTAG programming. We will assume that you have already installed the software on your computer and connected your JTAG adapter and target device. If you need help with these steps, please refer to the official documentation of the software.

Step 1: Detecting the JTAG Chain

The first step is to detect the JTAG chain of your target device. The JTAG chain consists of one or more JTAG parts (devices) that are connected in series through four signals: TDI (Test Data In), TDO (Test Data Out), TCK (Test Clock), and TMS (Test Mode Select). To detect the JTAG chain, you need to run the discovery command in the Ejtag Tiny Tools Software console. This command will scan the JTAG chain and display the number of parts, their IDs, and their instructions.

For example, if you run the discovery command on a device with two parts, you may see something like this:

JTAG chain length: 2

Part 0: IDCODE = 0x05f0f0f0

Part 0: INSTRUCTION = 0x00000000

Part 1: IDCODE = 0x05f0f0f1

Part 1: INSTRUCTION = 0x00000000

The IDCODE is a 32-bit value that identifies the manufacturer and model of the part. The INSTRUCTION is a variable-length value that specifies the current operation mode of the part. You can use these values to look up more information about your parts in the BSDL files provided by the software.

Step 2: Selecting a Part

The next step is to select a part that you want to program. You can use the part command to specify the index of the part in the JTAG chain. For example, if you want to select part 0, you can run:

part 0

This will make part 0 the active part for subsequent commands. You can also use the get command to check the current active part. For example:

get part

Part 0

Step 3: Loading a Bus Driver

The next step is to load a bus driver for your part. A bus driver is a module that defines how to access the memory and registers of your part through JTAG. Ejtag Tiny Tools Software supports various bus drivers for different architectures and devices, such as ARM, MIPS, SH4, PXA2x0, SA1110, BCM1250, S3C4510X, and more. You can use the initbus command to load a bus driver for your part. For example, if your part is a MIPS processor with an EJTAG interface, you can run:

initbus ejtag

Bus driver: EJTAG

This will load the EJTAG bus driver for your part. You can also use the get command to check the current bus driver. For example:

get bus

Bus driver: EJTAG

Step 4: Reading and Writing Memory

The final step is to read and write memory on your part using JTAG. You can use the detectflash a474f39169