I have a PM3 Easy that I purchased quite a while ago that has a ATMEL AT91SAM7S256 on it and I bought a ATMEL AT91SAM7S512 off of Ebay. I am going to replace the chip with the larger one. Will I be able to program the bootloader and firmware through the USB com port? Or will I need to use a JTAG programmer?
It looks like there is an easy way to use a Raspberry Pi as a JTAG programmer.
Any help would be greatly appreciated.
I think @Zwack might be a good person to summon for this, but as he has not replied already, I could be wrong.
He has done a bit of crossover work with PM3 Easy and Raspberry Pi, not directly related, but still in the same wheelhouse
https://forum.dangerousthings.com/t/proxmark3-easy-and-raspberry-pi-zero-2-w/14310/24
I am no expert in this area, but assuming that you have replaced the chip you can use openocd and a raspberry pi to bootstrap the firmware. I have never done this but found several pages that detailed the same procedure.
You may want to put the bootloader on there before mounting the IC … The PM3 may not have the proper circuit to boot brom a blanc chip.