1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/mtd/partitions/brcm,bcm947xx-cfe-partitions.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Broadcom BCM47xx Partitions
8
9 description: |
10 Broadcom is one of hardware manufacturers providing SoCs (BCM47xx) used in
11 home routers. Their BCM947xx boards using CFE bootloader have several
12 partitions without any on-flash partition table. On some devices their sizes
13 and/or meanings can also vary so fixed partitioning can't be used.
14
15 Discovering partitions on these devices is possible thanks to having a special
16 header and/or magic signature at the beginning of each of them. They are also
17 block aligned which is important for determinig a size.
18
19 Most of partitions use ASCII text based magic for determining a type. More
20 complex partitions (like TRX with its HDR0 magic) may include extra header
21 containing some details, including a length.
22
23 A list of supported partitions includes:
24 1) Bootloader with Broadcom's CFE (Common Firmware Environment)
25 2) NVRAM with configuration/calibration data
26 3) Device manufacturer's data with some default values (e.g. SSIDs)
27 4) TRX firmware container which can hold up to 4 subpartitions
28 5) Backup TRX firmware used after failed upgrade
29
30 As mentioned earlier, role of some partitions may depend on extra
31 configuration. For example both: main firmware and backup firmware use the
32 same TRX format with the same header. To distinguish currently used firmware a
33 CFE's environment variable "bootpartition" is used.
34
35 maintainers:
36 - Rafał Miłecki <rafal@milecki.pl>
37
38 select: false
39
40 properties:
41 compatible:
42 const: brcm,bcm947xx-cfe-partitions
43
44 additionalProperties: false
45
46 examples:
47 - |
48 partitions {
49 compatible = "brcm,bcm947xx-cfe-partitions";
50 };
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