PCB routing: Using unconnected/floating pins Topic is solved
If they are connected to ground the FLASH will not be readable. These pins are directly connected to a FLASH chip inside the IC package.
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Oh, I haven't expected that. Does that mean that the firmware can be probed via that pins at boot time?
The FLASH is directly accessible on those pins when the MCU is held in reset. If you need code security you'll have to use the AES bootloader or something.
Thanks for the information. Have a nice day!
For those who are interested in, the AES bootloader is described here:
https://www.xmos.ai/file/safeguard-ip-a ... thenticity
https://www.xmos.ai/file/safeguard-ip-a ... thenticity