Hi,
I found out how to make UART4 work:
> &uart4 {
> status = "okay";
> };
>
&uart4 {
pinctrl-names = "default";
pinctrl-0 = <&uart4_pins_a>;
status = "okay";
};
This is for the UEXT UART on GPIO-1 and it works fine with that.
However, since the UEXT is pluggable and not enabled by default I'm
currently trying to create a device tree overlay for it and for the
devices that I connect to it. Is that the right way?
> Also, I tried to use dtc to create an external dtb file to avoid
> having to modify the kernel's arch/arm/boot . That gave
> me a syntax error on the plugin line (see below). Searching the
> internet gave me some posts where they said that only very new dtc
> supports "plugins". I have Debian 8.1's dtc.
There's a dtc in the Linux sources under scripts/dtc/dtc .
I tried to specify "-@" in order for dtc to allow unresolved symbols.
Neither the scripts/dtc nor the device-tree-compiler of Debian 8.2 know
that option.
Is there some current documentation on how to do all that?
I saw https://linux-sunxi.org/Device_Tree but it doesn't mention
overlays at all.
Thanks,
Danny
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