Embedded Boundary Scan, for Test and Debug. A prototype testing and debugging framework

For example, if the image is stored in the flash memory and the jumpers are set to use the flash memory, the processor fetches its first instruction from the starting address where the flash is mapped. Therefore, set the jumpers appropriately according to the image storage. This final production method, however, is impractical during the development stage because developers construct software in incremental steps with high frequency. The process is interactive in that a portion of the code is written, debugged, and tested, and the entire process then repeats for the new code. Reprogramming the EEPROM or the flash memory each time the code changes due to bugs or code addition is time consuming. The methods for downloading the image over a serial or a network connection or for downloading the image through a JTAG or BDM interface solve this problem by transferring the image directly into the target system's RAM memory. 3.2.1 Embedded Loader A common approach taken at the early development phase is to write a loader program for the target side, which is called the loader, and use the loader to download the image from the host system ...»