raspberrypi-firmware-dt/uboot-bcm2835-pl011-overlay.dts

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/*
* As opposed to the upstream/downstream kernel, u-boot needs a special
* compatible string to access RPi, RPi2 and RPi0's serial consoles. This was
* removed from both upstream and downstream Linux's device-trees as there is
* no existing binding or use for it. While we fix this in upstream u-boot,
* this overlay fixes booting on those platforms.
*/
/dts-v1/;
/plugin/;
/{
compatible = "brcm,bcm2835";
fragment@0 {
target = <&uart0>;
__overlay__ {
compatible = "brcm,bcm2835-pl011", "arm,pl011", "arm,primecell";
};
};
};