Hi, is there a possibility to interrupt autoboot when a GPIO pin has a certain value? I know there is CONFIG_AUTOBOOT_DELAY_STR and that should suffice in most cases when there is another peripheral connected to the UART, but think about the following setup I have:
A processor (in my case a AR9331) has a single UART that is used as U-Boot console. The same UART is connected to a radio transceiver. Therefore, an attacker MIGHT send the CONFIG_AUTOBOOT_DELAY_STR to the radio transceiver at the right time to insert malicious code.
I know, there are other possibilities to handle this (e.g. by ensuring that the radio transceiver is only activated when the processor is booted), but I think having a dedicated "interrupt autoboot"-button would be an elegant solution.
What do you think?
Greetings, Florian