If the programmer does not provide the code, no flash dump/write access is allowed. This code is used by the built-in bootrom to allow/deny access to the flash via the 'Standard Serial I/O' protocol for programming (selectable via M0/M1 straps). The EC has a 7-byte ID code that it keeps in flash. And finally, I added an oscilloscope to the voltage shunt and a logic analyzer to serial lines, for good measure.Īfter checking connectivity to the bootrom and that I was getting power traces, it was time to dive in. I also attached a ChipWhisperer with a shunt sensor board to the EC's power line. I've then attached an STM32F303RE on a Nucleo board as a general interface board to the EC's serial and reset. I've etched a new board that lets me access important pins (serial TX, RX, CLK, BUSY RST and power lines) without having to fiddle with the previous hacky breakout board. ![]() ![]() After another long hiatus, I've come back to this project.
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