FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/firmware/coreboot.txt

     COREBOOT firmware information
     
     The device tree node to communicate the location of coreboot's memory-resident
     bookkeeping structures to the kernel. Since coreboot itself cannot boot a
     device-tree-based kernel (yet), this node needs to be inserted by a
     second-stage bootloader (a coreboot "payload").
     
     Required properties:
      - compatible: Should be "coreboot"
     - reg: Address and length of the following two memory regions, in order:
            1.) The coreboot table. This is a list of variable-sized descriptors
            that contain various compile- and run-time generated firmware
            parameters. It is identified by the magic string "LBIO" in its first
            four bytes.
            See coreboot's src/commonlib/include/commonlib/coreboot_tables.h for
            details.
            2.) The CBMEM area. This is a downward-growing memory region used by
            coreboot to dynamically allocate data structures that remain resident.
            It may or may not include the coreboot table as one of its members. It
            is identified by a root node descriptor with the magic number
            0xc0389481 that resides in the topmost 8 bytes of the area.
            See coreboot's src/include/imd.h for details.
    
    Example:
            firmware {
                    ranges;
    
                    coreboot {
                            compatible = "coreboot";
                            reg = <0xfdfea000 0x264>,
                                  <0xfdfea000 0x16000>;
                    }
            };

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