97 lines
2.3 KiB
YAML
97 lines
2.3 KiB
YAML
# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
|
|
%YAML 1.2
|
|
---
|
|
$id: http://devicetree.org/schemas/nvmem/u-boot,env.yaml#
|
|
$schema: http://devicetree.org/meta-schemas/core.yaml#
|
|
|
|
title: U-Boot environment variables
|
|
|
|
description: |
|
|
U-Boot uses environment variables to store device parameters and
|
|
configuration. They may be used for booting process, setup or keeping end user
|
|
info.
|
|
|
|
Data is stored using U-Boot specific formats (variant specific header and NUL
|
|
separated key-value pairs).
|
|
|
|
Environment data can be stored on various storage entities, e.g.:
|
|
1. Raw flash partition
|
|
2. UBI volume
|
|
|
|
This binding allows marking storage device (as containing env data) and
|
|
specifying used format.
|
|
|
|
Right now only flash partition case is covered but it may be extended to e.g.
|
|
UBI volumes in the future.
|
|
|
|
Variables can be defined as NVMEM device subnodes.
|
|
|
|
maintainers:
|
|
- Rafał Miłecki <rafal@milecki.pl>
|
|
|
|
properties:
|
|
compatible:
|
|
oneOf:
|
|
- description: A standalone env data block
|
|
const: u-boot,env
|
|
- description: Two redundant blocks with active one flagged
|
|
const: u-boot,env-redundant-bool
|
|
- description: Two redundant blocks with active having higher counter
|
|
const: u-boot,env-redundant-count
|
|
- description: Broadcom's variant with custom header
|
|
const: brcm,env
|
|
|
|
reg:
|
|
maxItems: 1
|
|
|
|
bootcmd:
|
|
type: object
|
|
description: Command to use for automatic booting
|
|
|
|
ethaddr:
|
|
type: object
|
|
description: Ethernet interface's MAC address
|
|
|
|
additionalProperties: false
|
|
|
|
examples:
|
|
- |
|
|
partitions {
|
|
compatible = "fixed-partitions";
|
|
#address-cells = <1>;
|
|
#size-cells = <1>;
|
|
|
|
partition@0 {
|
|
reg = <0x0 0x40000>;
|
|
label = "u-boot";
|
|
read-only;
|
|
};
|
|
|
|
env: partition@40000 {
|
|
compatible = "u-boot,env";
|
|
reg = <0x40000 0x10000>;
|
|
|
|
mac: ethaddr {
|
|
};
|
|
};
|
|
};
|
|
- |
|
|
partitions {
|
|
compatible = "fixed-partitions";
|
|
#address-cells = <1>;
|
|
#size-cells = <1>;
|
|
|
|
partition@0 {
|
|
reg = <0x0 0x100000>;
|
|
compatible = "brcm,u-boot";
|
|
label = "u-boot";
|
|
|
|
partition-u-boot-env {
|
|
compatible = "brcm,env";
|
|
|
|
ethaddr {
|
|
};
|
|
};
|
|
};
|
|
};
|