arch/arm64/boot/dts/marvell/ac5x-rd-carrier.dtsi

Source file repositories/reference/linux-study-clean/arch/arm64/boot/dts/marvell/ac5x-rd-carrier.dtsi

File Facts

System
Linux kernel
Corpus path
arch/arm64/boot/dts/marvell/ac5x-rd-carrier.dtsi
Extension
.dtsi
Size
1433 bytes
Lines
35
Domain
Architecture Layer
Bucket
arch/arm64
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+ OR MIT)
/*
 * Copyright (C) 2023 Marvell International Ltd.
 *
 * Device tree for the AC5X RD Type 7 Com Express carrier board,
 * This specific board in external mode (see below) only maintains
 * a PCIe link with the COM Express CPU module, which does not
 * require any special DTS definitions.
 *
 * AC5X RD can either work as you would expect, as a complete standalone
 * box using the internal CPU, or you can move the switch on the back of
 * the box to "external" mode, and connect via an external cable a kit
 * which would allow it to use an external CPU COM Express module,
 * mounted on top of an interposer kit.
 *
 * So in this case, once the switch is set to external mode as explained above,
 * the AC5X RD becomes part of the carrier solution.
 * This is a development/reference solution, not a full commercial solution,
 * hence it was designed with the flexibility to be configured in different
 * modes of operation.
 *
 * When the board boots in the external CPU mode, the internal CPU is disabled,
 * and only the switch portion of the SOC acts as a PCIe end-point, Hence there
 * is no need to describe this internal (disabled CPU) in the device tree.
 *
 * There is no CPU booting in this mode on the carrier,
 * only on the COM Express CPU module.
 */

/ {
	model = "Marvell Armada AC5X RD COM EXPRESS type 7 carrier board";
	compatible = "marvell,rd-ac5x-carrier";

};

Annotation

Implementation Notes