| // 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"; |
| |
| }; |
