FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/mtd/partitions/brcm,bcm947xx-cfe-partitions.txt

     Broadcom BCM47xx Partitions
     ===========================
     
     Broadcom is one of hardware manufacturers providing SoCs (BCM47xx) used in
     home routers. Their BCM947xx boards using CFE bootloader have several partitions
     without any on-flash partition table. On some devices their sizes and/or
     meanings can also vary so fixed partitioning can't be used.
     
     Discovering partitions on these devices is possible thanks to having a special
    header and/or magic signature at the beginning of each of them. They are also
    block aligned which is important for determinig a size.
    
    Most of partitions use ASCII text based magic for determining a type. More
    complex partitions (like TRX with its HDR0 magic) may include extra header
    containing some details, including a length.
    
    A list of supported partitions includes:
    1) Bootloader with Broadcom's CFE (Common Firmware Environment)
    2) NVRAM with configuration/calibration data
    3) Device manufacturer's data with some default values (e.g. SSIDs)
    4) TRX firmware container which can hold up to 4 subpartitions
    5) Backup TRX firmware used after failed upgrade
    
    As mentioned earlier, role of some partitions may depend on extra configuration.
    For example both: main firmware and backup firmware use the same TRX format with
    the same header. To distinguish currently used firmware a CFE's environment
    variable "bootpartition" is used.
    
    
    Devices using Broadcom partitions described above should should have flash node
    with a subnode named "partitions" using following properties:
    
    Required properties:
    - compatible : (required) must be "brcm,bcm947xx-cfe-partitions"
    
    Example:
    
    flash@0 {
            partitions {
                    compatible = "brcm,bcm947xx-cfe-partitions";
            };
    };

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