I got the second SD card working, it wasn't that hard, thanks to the device tree.
But I'm still struggling with the act led...
I successfully compiled the kernel to feature a led under /sys/class/leds , but I don't know how to assign the correct GPIO Port. I would like to change the GPIO Pin from PG0 to PB4 but how do I do that?
Snippet from sun8i-v3s-licheepi-zero.dts:
compatible = "gpio-leds";
label = "act_led:green:usr";
gpios = <&pio 6 0 GPIO_ACTIVE_HIGH>; /* PG0 */
linux,default-trigger = "ide-disk";
default-state = "off";