1# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/nvmem/u-boot,env.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: U-Boot environment variables
8
9description: |
10  U-Boot uses environment variables to store device parameters and
11  configuration. They may be used for booting process, setup or keeping end user
12  info.
13
14  Data is stored using U-Boot specific formats (variant specific header and NUL
15  separated key-value pairs).
16
17  Environment data can be stored on various storage entities, e.g.:
18  1. Raw flash partition
19  2. UBI volume
20
21  This binding allows marking storage device (as containing env data) and
22  specifying used format.
23
24  Right now only flash partition case is covered but it may be extended to e.g.
25  UBI volumes in the future.
26
27  Variables can be defined as NVMEM device subnodes.
28
29maintainers:
30  - Rafał Miłecki <rafal@milecki.pl>
31
32properties:
33  compatible:
34    oneOf:
35      - description: A standalone env data block
36        const: u-boot,env
37      - description: Two redundant blocks with active one flagged
38        const: u-boot,env-redundant-bool
39      - description: Two redundant blocks with active having higher counter
40        const: u-boot,env-redundant-count
41
42  reg:
43    maxItems: 1
44
45  bootcmd:
46    type: object
47    description: Command to use for automatic booting
48
49  ethaddr:
50    type: object
51    description: Ethernet interface's MAC address
52
53additionalProperties: false
54
55examples:
56  - |
57    partitions {
58        compatible = "fixed-partitions";
59        #address-cells = <1>;
60        #size-cells = <1>;
61
62        partition@0 {
63            reg = <0x0 0x40000>;
64            label = "u-boot";
65            read-only;
66        };
67
68        env: partition@40000 {
69            compatible = "u-boot,env";
70            reg = <0x40000 0x10000>;
71
72            mac: ethaddr {
73            };
74        };
75    };
76