spi partition modification

&spi {
        status = "okay";
        num-cs = <1>;

        flash@0 {
                compatible = "jedec,spi-nor";
                reg = <0>;
                spi-max-frequency = <25000000>;

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

                        uboot: partition@0 {
                                label = "u-boot";
                                reg = <0x000000 0x080000>;
                                read-only;
                        };

                        config: partition@80000 {
                                label = "config";
                                reg = <0x080000 0x1f0000>;
                                read-only;
                        };

                        art: partition@1f0000 {
                                label = "art";
                                reg = <0x1f0000 0x200000>;
                                read-only;
                        };


                        partition@200000 {
                                label = "kernel";
                                reg = <0x200000 0x400000>;
                        };

                        partition@400000 {
                                label = "rootfs";
                                reg = <0x400000 0x1000000>;
                        };
                };
        };
};