alt Hacker NewsThere's something wrong if you're using Jtag on a field unit. In my experience, once a chip is up and running we implement higher level communication and debug methods.
There's something wrong if you're using Jtag on a field unit. In my experience, once a chip is up and running we implement higher level communication and debug methods.
To give an automotive example, a field unit may fail and be RMA'd to the tier 1 to improve their production line. They don't have access/documentation for the production software, and it wasn't developed to interact with their diagnostic tooling. They'll need to reliably reflash their own test software onto a board with potential hardware failures. JTAG is sometimes what they request to do that.