xref: /openbmc/u-boot/include/fdt.h (revision 6b7c0f5e)
1 #ifndef _FDT_H
2 #define _FDT_H
3 
4 #ifndef __ASSEMBLY__
5 
6 struct fdt_header {
7 	uint32_t magic;			 /* magic word FDT_MAGIC */
8 	uint32_t totalsize;		 /* total size of DT block */
9 	uint32_t off_dt_struct;		 /* offset to structure */
10 	uint32_t off_dt_strings;	 /* offset to strings */
11 	uint32_t off_mem_rsvmap;	 /* offset to memory reserve map */
12 	uint32_t version;		 /* format version */
13 	uint32_t last_comp_version;	 /* last compatible version */
14 
15 	/* version 2 fields below */
16 	uint32_t boot_cpuid_phys;	 /* Which physical CPU id we're
17 					    booting on */
18 	/* version 3 fields below */
19 	uint32_t size_dt_strings;	 /* size of the strings block */
20 
21 	/* version 17 fields below */
22 	uint32_t size_dt_struct;	 /* size of the structure block */
23 };
24 
25 struct fdt_reserve_entry {
26 	uint64_t address;
27 	uint64_t size;
28 };
29 
30 struct fdt_node_header {
31 	uint32_t tag;
32 	char name[0];
33 };
34 
35 struct fdt_property {
36 	uint32_t tag;
37 	uint32_t len;
38 	uint32_t nameoff;
39 	char data[0];
40 };
41 
42 #endif /* !__ASSEMBLY */
43 
44 #define FDT_MAGIC	0xd00dfeed	/* 4: version, 4: total size */
45 #define FDT_TAGSIZE	sizeof(uint32_t)
46 
47 #define FDT_BEGIN_NODE	0x1		/* Start node: full name */
48 #define FDT_END_NODE	0x2		/* End node */
49 #define FDT_PROP	0x3		/* Property: name off,
50 					   size, content */
51 #define FDT_NOP		0x4		/* nop */
52 #define FDT_END		0x9
53 
54 #define FDT_V1_SIZE	(7*sizeof(uint32_t))
55 #define FDT_V2_SIZE	(FDT_V1_SIZE + sizeof(uint32_t))
56 #define FDT_V3_SIZE	(FDT_V2_SIZE + sizeof(uint32_t))
57 #define FDT_V16_SIZE	FDT_V3_SIZE
58 #define FDT_V17_SIZE	(FDT_V16_SIZE + sizeof(uint32_t))
59 
60 /* adding a ramdisk needs 0x44 bytes in version 2008.10 */
61 #define FDT_RAMDISK_OVERHEAD	0x80
62 #endif /* _FDT_H */
63