openwrt/target/linux/ramips/dts/mt7621_xiaomi_nand_128m.dtsi

// SPDX-License-Identifier: GPL-2.0-or-later OR MIT

#include "mt7621.dtsi"

#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/input/input.h>

/ {
	chosen {
		bootargs = "console=ttyS0,115200n8";
	};

	keys: keys {
		compatible = "gpio-keys";

		reset {
			label = "reset";
			gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
			linux,code = <KEY_RESTART>;
		};
	};
};

&nand {
	status = "okay";

	partitions {
		compatible = "fixed-partitions";
		#address-cells = <1>;
		#size-cells = <1>;

		partition@0 {
			label = "Bootloader";
			reg = <0x0 0x80000>;
			read-only;
		};

		partition@80000 {
			label = "Config";
			reg = <0x80000 0x40000>;
		};

		partition@c0000 {
			label = "Bdata";
			reg = <0xc0000 0x40000>;
			read-only;
		};

		partition@100000 {
			label = "factory";
			reg = <0x100000 0x40000>;
			read-only;

			nvmem-layout {
				compatible = "fixed-layout";
				#address-cells = <1>;
				#size-cells = <1>;

				eeprom_factory_0: eeprom@0 {
					reg = <0x0 0x400>;
				};

				eeprom_factory_8000: eeprom@8000 {
					reg = <0x8000 0x200>;
				};

				macaddr_factory_e000: macaddr@e000 {
					reg = <0xe000 0x6>;
				};

				macaddr_factory_e006: macaddr@e006 {
					reg = <0xe006 0x6>;
				};
			};
		};

		partition@140000 {
			label = "crash";
			reg = <0x140000 0x40000>;
		};

		partition@180000 {
			label = "crash_syslog";
			reg = <0x180000 0x40000>;
		};

		partition@1c0000 {
			label = "reserved0";
			reg = <0x1c0000 0x40000>;
			read-only;
		};

		/* uboot expects to find kernels at 0x200000 & 0x600000
		 * referred to as system 1 & system 2 respectively.
		 * a kernel is considered suitable for handing control over
		 * if its linux magic number exists & uImage CRC are correct.
		 * If either of those conditions fail, a matching sys'n'_fail flag
		 * is set in uboot env & a restart performed in the hope that the
		 * alternate kernel is okay.
		 * if neither kernel checksums ok and both are marked failed, system 2
		 * is booted anyway.
		 *
		 * Note uboot's tftp flash install writes the transferred
		 * image to both kernel partitions.
		 */

		/* We keep stock xiaomi firmware (kernel0) here */
		partition@200000 {
			label = "kernel_stock";
			reg = <0x200000 0x400000>;
		};

		partition@600000 {
			label = "kernel";
			reg = <0x600000 0x400000>;
		};

		/* ubi partition is the result of squashing
		 * next consecutive stock partitions:
		 * - rootfs0 (rootfs partition for stock kernel0),
		 * - rootfs1 (rootfs partition for stock failsafe kernel1),
		 * - overlay (used as ubi overlay in stock fw)
		 * resulting 117,5MiB space for packages.
		 */

		partition@a00000 {
			label = "ubi";
			reg = <0xa00000 0x7580000>;
		};
	};
};