Drive LOW UART_AO_A_TXD when powered off

#1

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

#2

@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.

#3

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.

#4

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