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The partitions.yaml schema is an unusual structure in that it includes all possible partition types, and it disables the normal matching by compatible strings. As partitions.yaml has nothing to match on, it is only applied when explicitly referenced. The use of "oneOf" also results in misleading warnings which are difficult to understand. Drop partitions.yaml and rely on the standard compatible matching instead. The "mmc-card" case previously allowed any partition type, but now only allows "fixed-partitions". There aren't any users and the original intent appeared to be only for "fixed-partitions". Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # For MMC Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com> Signed-off-by: Rob Herring (Arm) <robh@kernel.org> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
49 lines
1.8 KiB
YAML
49 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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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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