arch/arm/boot/dts/broadcom/bcm2835.dtsi

Source file repositories/reference/linux-study-clean/arch/arm/boot/dts/broadcom/bcm2835.dtsi

File Facts

System
Linux kernel
Corpus path
arch/arm/boot/dts/broadcom/bcm2835.dtsi
Extension
.dtsi
Size
1333 bytes
Lines
55
Domain
Architecture Layer
Bucket
arch/arm
Inferred role
Architecture Layer: configuration, schema, or hardware description
Status
atlas-only

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
#include "bcm283x.dtsi"
#include "bcm2835-common.dtsi"

/ {
	compatible = "brcm,bcm2835";

	cpus {
		#address-cells = <1>;
		#size-cells = <0>;

		cpu@0 {
			device_type = "cpu";
			compatible = "arm,arm1176jzf-s";
			reg = <0x0>;
			/* Source for d/i-cache-line-size and d/i-cache-sets
			 * https://developer.arm.com/documentation/ddi0301
			 * /h/level-one-memory-system/cache-organization?lang=en
			 *
			 * Source for d/i-cache-size
			 * https://forums.raspberrypi.com/viewtopic.php?t=98428
			 *
			 * NOTE: The BCM2835 has a L2 cache but it is dedicated to the GPU
			 * It can be shared with the CPU through fw settings,
			 * but this is not recommended.
			 */
			d-cache-size = <0x4000>;
			d-cache-line-size = <16>;
			d-cache-sets = <256>; // 16KiB(size)/16(line-size)=1024ways/4-way set
			i-cache-size = <0x4000>;
			i-cache-line-size = <16>;
			i-cache-sets = <256>; // 16KiB(size)/16(line-size)=1024ways/4-way set
		};
	};

	soc {
		ranges = <0x7e000000 0x20000000 0x02000000>;
		dma-ranges = <0x40000000 0x00000000 0x20000000>;
	};

	arm-pmu {
		compatible = "arm,arm1176-pmu";
	};
};

&cpu_thermal {
	coefficients = <(-538)	407000>;
};

/* enable thermal sensor with the correct compatible property set */
&thermal {
	compatible = "brcm,bcm2835-thermal";
	status = "okay";
};

Annotation

Implementation Notes