1COREBOOT firmware information 2 3The device tree node to communicate the location of coreboot's memory-resident 4bookkeeping structures to the kernel. Since coreboot itself cannot boot a 5device-tree-based kernel (yet), this node needs to be inserted by a 6second-stage bootloader (a coreboot "payload"). 7 8Required properties: 9 - compatible: Should be "coreboot" 10 - reg: Address and length of the following two memory regions, in order: 11 1.) The coreboot table. This is a list of variable-sized descriptors 12 that contain various compile- and run-time generated firmware 13 parameters. It is identified by the magic string "LBIO" in its first 14 four bytes. 15 See coreboot's src/commonlib/include/commonlib/coreboot_tables.h for 16 details. 17 2.) The CBMEM area. This is a downward-growing memory region used by 18 coreboot to dynamically allocate data structures that remain resident. 19 It may or may not include the coreboot table as one of its members. It 20 is identified by a root node descriptor with the magic number 21 0xc0389481 that resides in the topmost 8 bytes of the area. 22 See coreboot's src/include/imd.h for details. 23 24Example: 25 firmware { 26 ranges; 27 28 coreboot { 29 compatible = "coreboot"; 30 reg = <0xfdfea000 0x264>, 31 <0xfdfea000 0x16000>; 32 } 33 }; 34