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991088a637
Parser compatibles cannot be used anywhere, and the list is limited. In order to constrain this list, enumerate them all under the top "partitions" subnode. New parsers will have to add their own compatible here as well. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Reviewed-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/linux-mtd/20221114090315.848208-12-miquel.raynal@bootlin.com
51 lines
1.8 KiB
YAML
51 lines
1.8 KiB
YAML
# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/mtd/partitions/brcm,bcm947xx-cfe-partitions.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Broadcom BCM47xx Partitions
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description: |
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Broadcom is one of hardware manufacturers providing SoCs (BCM47xx) used in
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home routers. Their BCM947xx boards using CFE bootloader have several
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partitions without any on-flash partition table. On some devices their sizes
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and/or meanings can also vary so fixed partitioning can't be used.
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Discovering partitions on these devices is possible thanks to having a special
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header and/or magic signature at the beginning of each of them. They are also
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block aligned which is important for determinig a size.
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Most of partitions use ASCII text based magic for determining a type. More
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complex partitions (like TRX with its HDR0 magic) may include extra header
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containing some details, including a length.
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A list of supported partitions includes:
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1) Bootloader with Broadcom's CFE (Common Firmware Environment)
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2) NVRAM with configuration/calibration data
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3) Device manufacturer's data with some default values (e.g. SSIDs)
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4) TRX firmware container which can hold up to 4 subpartitions
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5) Backup TRX firmware used after failed upgrade
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As mentioned earlier, role of some partitions may depend on extra
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configuration. For example both: main firmware and backup firmware use the
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same TRX format with the same header. To distinguish currently used firmware a
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CFE's environment variable "bootpartition" is used.
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maintainers:
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- Rafał Miłecki <rafal@milecki.pl>
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select: false
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properties:
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compatible:
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const: brcm,bcm947xx-cfe-partitions
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additionalProperties: false
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examples:
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- |
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partitions {
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compatible = "brcm,bcm947xx-cfe-partitions";
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};
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