pfuhrman

Thanks, @Elodg. I don't see how I could have damaged it. My work with the board has mainly been with Petalinux and FPGA fabric designs, and I have programmed QSPI for bootup. I have not done anything with J38, I was just speculating about how to see if the PMCU was doing anything at startup. I don't see anything over I2C or the LED. I guess that all the IRPS5401's are pre-programmed in NVM and don't need tweaking at startup, other than VADJ if requested. For my immediate needs I can use I2C from the ZU3EG to do that. But I am concerned if there is anything else I am missing, other than the cooling control. For that I can jumper the fan ON. I would be interested in what could be done to reprogram it, if that's what's required. I have tried to talk over USB-UART but I don't see any activity there. But I may be able to connect an Arduino via J38 in ISP mode. In any case, please have your colleague message me.

Thanks, @JColvin. Meanwhile, I have experimented with I2C from the ZU3EG, and I find that I can turn on the VADJ power controller and set the voltage with a several register settings. But the PMCU just seems to be dead. But it took a while going through the documentation on these Infineon PMICs. I'd like to know how much does normal operation rely on the ATmega PMCU, or is it mainly for health monitoring.

I have a Genesys ZU Rev. B board which comes up fine except the PMCU LED does not come on or blink at all, as it says in the reference manual. Nor can I turn on VADJ by outputting on the LEVEL0/1 and VADJ_AUTON signals from the 3EG chip. I have tried communicating with the ATMega over its serial port, but I get no response. For example, "0301" should return the firmware version. I have a logic analyzer on J36 to observe the startup I2C activity from the PMCU, but I see no activity at main power-on. I'm assuming that the PMCU is working since the ZU3EG comes up, but I also need to bring up VADJ. What's the best way to debug this function? Can the ATmega328 bootloader be accessed over the J38 debug port, once you load a 6 pin header?