0001 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
0002 %YAML 1.2
0003 ---
0004 $id: http://devicetree.org/schemas/nvmem/u-boot,env.yaml#
0005 $schema: http://devicetree.org/meta-schemas/core.yaml#
0006
0007 title: U-Boot environment variables
0008
0009 description: |
0010 U-Boot uses environment variables to store device parameters and
0011 configuration. They may be used for booting process, setup or keeping end user
0012 info.
0013
0014 Data is stored using U-Boot specific formats (variant specific header and NUL
0015 separated key-value pairs).
0016
0017 Environment data can be stored on various storage entities, e.g.:
0018 1. Raw flash partition
0019 2. UBI volume
0020
0021 This binding allows marking storage device (as containing env data) and
0022 specifying used format.
0023
0024 Right now only flash partition case is covered but it may be extended to e.g.
0025 UBI volumes in the future.
0026
0027 maintainers:
0028 - Rafał Miłecki <rafal@milecki.pl>
0029
0030 properties:
0031 compatible:
0032 oneOf:
0033 - description: A standalone env data block
0034 const: u-boot,env
0035 - description: Two redundant blocks with active one flagged
0036 const: u-boot,env-redundant-bool
0037 - description: Two redundant blocks with active having higher counter
0038 const: u-boot,env-redundant-count
0039
0040 reg:
0041 maxItems: 1
0042
0043 additionalProperties: false
0044
0045 examples:
0046 - |
0047 partitions {
0048 compatible = "fixed-partitions";
0049 #address-cells = <1>;
0050 #size-cells = <1>;
0051
0052 partition@0 {
0053 reg = <0x0 0x40000>;
0054 label = "u-boot";
0055 read-only;
0056 };
0057
0058 env: partition@40000 {
0059 compatible = "u-boot,env";
0060 reg = <0x40000 0x10000>;
0061 };
0062 };
