| 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>; |
| } |
| }; |
