Drive LOW UART_AO_A_TXD when powered off

Hello everyone,

When the Zero is powered off, the UART_AO_A_TXD stays at v3.3.

I need it to be LOW when the Zero is powered off.
Can you help to fix this behavior?

Many Thanks

@jack @RadxaYuntian @RadxaNaoki

@theophile looks like your gpio-poweroff commit is what I’m looking for however, I can’t seem to find if it was pushed to Armbian kernel? I’m using DietPi.

I don’t believe it has. You’ll probably need to use the Armbian build tool to recompile the kernel but interrupt the process to manually apply the patches and edit the kernel config.

You can’t change the pin default power on state or power off state. Those are hardware defined.