xref: /openbmc/u-boot/cmd/fdt.c (revision 9b643e312d528f291966c1f30b0d90bf3b1d43dc)
1  /*
2   * (C) Copyright 2007
3   * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
4   * Based on code written by:
5   *   Pantelis Antoniou <pantelis.antoniou@gmail.com> and
6   *   Matthew McClintock <msm@freescale.com>
7   *
8   * SPDX-License-Identifier:	GPL-2.0+
9   */
10  
11  #include <common.h>
12  #include <command.h>
13  #include <linux/ctype.h>
14  #include <linux/types.h>
15  #include <asm/global_data.h>
16  #include <libfdt.h>
17  #include <fdt_support.h>
18  #include <mapmem.h>
19  #include <asm/io.h>
20  
21  #define MAX_LEVEL	32		/* how deeply nested we will go */
22  #define SCRATCHPAD	1024		/* bytes of scratchpad memory */
23  #define CMD_FDT_MAX_DUMP 64
24  
25  /*
26   * Global data (for the gd->bd)
27   */
28  DECLARE_GLOBAL_DATA_PTR;
29  
30  static int fdt_valid(struct fdt_header **blobp);
31  static int fdt_parse_prop(char *const*newval, int count, char *data, int *len);
32  static int fdt_print(const char *pathp, char *prop, int depth);
33  static int is_printable_string(const void *data, int len);
34  
35  /*
36   * The working_fdt points to our working flattened device tree.
37   */
38  struct fdt_header *working_fdt;
39  
40  void set_working_fdt_addr(ulong addr)
41  {
42  	void *buf;
43  
44  	buf = map_sysmem(addr, 0);
45  	working_fdt = buf;
46  	env_set_hex("fdtaddr", addr);
47  }
48  
49  /*
50   * Get a value from the fdt and format it to be set in the environment
51   */
52  static int fdt_value_env_set(const void *nodep, int len, const char *var)
53  {
54  	if (is_printable_string(nodep, len))
55  		env_set(var, (void *)nodep);
56  	else if (len == 4) {
57  		char buf[11];
58  
59  		sprintf(buf, "0x%08X", fdt32_to_cpu(*(fdt32_t *)nodep));
60  		env_set(var, buf);
61  	} else if (len%4 == 0 && len <= 20) {
62  		/* Needed to print things like sha1 hashes. */
63  		char buf[41];
64  		int i;
65  
66  		for (i = 0; i < len; i += sizeof(unsigned int))
67  			sprintf(buf + (i * 2), "%08x",
68  				*(unsigned int *)(nodep + i));
69  		env_set(var, buf);
70  	} else {
71  		printf("error: unprintable value\n");
72  		return 1;
73  	}
74  	return 0;
75  }
76  
77  /*
78   * Flattened Device Tree command, see the help for parameter definitions.
79   */
80  static int do_fdt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
81  {
82  	if (argc < 2)
83  		return CMD_RET_USAGE;
84  
85  	/*
86  	 * Set the address of the fdt
87  	 */
88  	if (strncmp(argv[1], "ad", 2) == 0) {
89  		unsigned long addr;
90  		int control = 0;
91  		struct fdt_header *blob;
92  		/*
93  		 * Set the address [and length] of the fdt.
94  		 */
95  		argc -= 2;
96  		argv += 2;
97  /* Temporary #ifdef - some archs don't have fdt_blob yet */
98  #ifdef CONFIG_OF_CONTROL
99  		if (argc && !strcmp(*argv, "-c")) {
100  			control = 1;
101  			argc--;
102  			argv++;
103  		}
104  #endif
105  		if (argc == 0) {
106  			if (control)
107  				blob = (struct fdt_header *)gd->fdt_blob;
108  			else
109  				blob = working_fdt;
110  			if (!blob || !fdt_valid(&blob))
111  				return 1;
112  			printf("The address of the fdt is %#08lx\n",
113  			       control ? (ulong)map_to_sysmem(blob) :
114  					env_get_hex("fdtaddr", 0));
115  			return 0;
116  		}
117  
118  		addr = simple_strtoul(argv[0], NULL, 16);
119  		blob = map_sysmem(addr, 0);
120  		if (!fdt_valid(&blob))
121  			return 1;
122  		if (control)
123  			gd->fdt_blob = blob;
124  		else
125  			set_working_fdt_addr(addr);
126  
127  		if (argc >= 2) {
128  			int  len;
129  			int  err;
130  			/*
131  			 * Optional new length
132  			 */
133  			len = simple_strtoul(argv[1], NULL, 16);
134  			if (len < fdt_totalsize(blob)) {
135  				printf ("New length %d < existing length %d, "
136  					"ignoring.\n",
137  					len, fdt_totalsize(blob));
138  			} else {
139  				/*
140  				 * Open in place with a new length.
141  				 */
142  				err = fdt_open_into(blob, blob, len);
143  				if (err != 0) {
144  					printf ("libfdt fdt_open_into(): %s\n",
145  						fdt_strerror(err));
146  				}
147  			}
148  		}
149  
150  		return CMD_RET_SUCCESS;
151  	}
152  
153  	if (!working_fdt) {
154  		puts(
155  			"No FDT memory address configured. Please configure\n"
156  			"the FDT address via \"fdt addr <address>\" command.\n"
157  			"Aborting!\n");
158  		return CMD_RET_FAILURE;
159  	}
160  
161  	/*
162  	 * Move the working_fdt
163  	 */
164  	if (strncmp(argv[1], "mo", 2) == 0) {
165  		struct fdt_header *newaddr;
166  		int  len;
167  		int  err;
168  
169  		if (argc < 4)
170  			return CMD_RET_USAGE;
171  
172  		/*
173  		 * Set the address and length of the fdt.
174  		 */
175  		working_fdt = (struct fdt_header *)simple_strtoul(argv[2], NULL, 16);
176  		if (!fdt_valid(&working_fdt))
177  			return 1;
178  
179  		newaddr = (struct fdt_header *)simple_strtoul(argv[3],NULL,16);
180  
181  		/*
182  		 * If the user specifies a length, use that.  Otherwise use the
183  		 * current length.
184  		 */
185  		if (argc <= 4) {
186  			len = fdt_totalsize(working_fdt);
187  		} else {
188  			len = simple_strtoul(argv[4], NULL, 16);
189  			if (len < fdt_totalsize(working_fdt)) {
190  				printf ("New length 0x%X < existing length "
191  					"0x%X, aborting.\n",
192  					len, fdt_totalsize(working_fdt));
193  				return 1;
194  			}
195  		}
196  
197  		/*
198  		 * Copy to the new location.
199  		 */
200  		err = fdt_open_into(working_fdt, newaddr, len);
201  		if (err != 0) {
202  			printf ("libfdt fdt_open_into(): %s\n",
203  				fdt_strerror(err));
204  			return 1;
205  		}
206  		working_fdt = newaddr;
207  #ifdef CONFIG_OF_SYSTEM_SETUP
208  	/* Call the board-specific fixup routine */
209  	} else if (strncmp(argv[1], "sys", 3) == 0) {
210  		int err = ft_system_setup(working_fdt, gd->bd);
211  
212  		if (err) {
213  			printf("Failed to add system information to FDT: %s\n",
214  			       fdt_strerror(err));
215  			return CMD_RET_FAILURE;
216  		}
217  #endif
218  	/*
219  	 * Make a new node
220  	 */
221  	} else if (strncmp(argv[1], "mk", 2) == 0) {
222  		char *pathp;		/* path */
223  		char *nodep;		/* new node to add */
224  		int  nodeoffset;	/* node offset from libfdt */
225  		int  err;
226  
227  		/*
228  		 * Parameters: Node path, new node to be appended to the path.
229  		 */
230  		if (argc < 4)
231  			return CMD_RET_USAGE;
232  
233  		pathp = argv[2];
234  		nodep = argv[3];
235  
236  		nodeoffset = fdt_path_offset (working_fdt, pathp);
237  		if (nodeoffset < 0) {
238  			/*
239  			 * Not found or something else bad happened.
240  			 */
241  			printf ("libfdt fdt_path_offset() returned %s\n",
242  				fdt_strerror(nodeoffset));
243  			return 1;
244  		}
245  		err = fdt_add_subnode(working_fdt, nodeoffset, nodep);
246  		if (err < 0) {
247  			printf ("libfdt fdt_add_subnode(): %s\n",
248  				fdt_strerror(err));
249  			return 1;
250  		}
251  
252  	/*
253  	 * Set the value of a property in the working_fdt.
254  	 */
255  	} else if (argv[1][0] == 's') {
256  		char *pathp;		/* path */
257  		char *prop;		/* property */
258  		int  nodeoffset;	/* node offset from libfdt */
259  		static char data[SCRATCHPAD];	/* storage for the property */
260  		const void *ptmp;
261  		int  len;		/* new length of the property */
262  		int  ret;		/* return value */
263  
264  		/*
265  		 * Parameters: Node path, property, optional value.
266  		 */
267  		if (argc < 4)
268  			return CMD_RET_USAGE;
269  
270  		pathp  = argv[2];
271  		prop   = argv[3];
272  
273  		nodeoffset = fdt_path_offset (working_fdt, pathp);
274  		if (nodeoffset < 0) {
275  			/*
276  			 * Not found or something else bad happened.
277  			 */
278  			printf ("libfdt fdt_path_offset() returned %s\n",
279  				fdt_strerror(nodeoffset));
280  			return 1;
281  		}
282  
283  		if (argc == 4) {
284  			len = 0;
285  		} else {
286  			ptmp = fdt_getprop(working_fdt, nodeoffset, prop, &len);
287  			if (len > SCRATCHPAD) {
288  				printf("prop (%d) doesn't fit in scratchpad!\n",
289  				       len);
290  				return 1;
291  			}
292  			if (ptmp != NULL)
293  				memcpy(data, ptmp, len);
294  
295  			ret = fdt_parse_prop(&argv[4], argc - 4, data, &len);
296  			if (ret != 0)
297  				return ret;
298  		}
299  
300  		ret = fdt_setprop(working_fdt, nodeoffset, prop, data, len);
301  		if (ret < 0) {
302  			printf ("libfdt fdt_setprop(): %s\n", fdt_strerror(ret));
303  			return 1;
304  		}
305  
306  	/********************************************************************
307  	 * Get the value of a property in the working_fdt.
308  	 ********************************************************************/
309  	} else if (argv[1][0] == 'g') {
310  		char *subcmd;		/* sub-command */
311  		char *pathp;		/* path */
312  		char *prop;		/* property */
313  		char *var;		/* variable to store result */
314  		int  nodeoffset;	/* node offset from libfdt */
315  		const void *nodep;	/* property node pointer */
316  		int  len = 0;		/* new length of the property */
317  
318  		/*
319  		 * Parameters: Node path, property, optional value.
320  		 */
321  		if (argc < 5)
322  			return CMD_RET_USAGE;
323  
324  		subcmd = argv[2];
325  
326  		if (argc < 6 && subcmd[0] != 's')
327  			return CMD_RET_USAGE;
328  
329  		var    = argv[3];
330  		pathp  = argv[4];
331  		prop   = argv[5];
332  
333  		nodeoffset = fdt_path_offset(working_fdt, pathp);
334  		if (nodeoffset < 0) {
335  			/*
336  			 * Not found or something else bad happened.
337  			 */
338  			printf("libfdt fdt_path_offset() returned %s\n",
339  				fdt_strerror(nodeoffset));
340  			return 1;
341  		}
342  
343  		if (subcmd[0] == 'n' || (subcmd[0] == 's' && argc == 5)) {
344  			int reqIndex = -1;
345  			int startDepth = fdt_node_depth(
346  				working_fdt, nodeoffset);
347  			int curDepth = startDepth;
348  			int curIndex = -1;
349  			int nextNodeOffset = fdt_next_node(
350  				working_fdt, nodeoffset, &curDepth);
351  
352  			if (subcmd[0] == 'n')
353  				reqIndex = simple_strtoul(argv[5], NULL, 16);
354  
355  			while (curDepth > startDepth) {
356  				if (curDepth == startDepth + 1)
357  					curIndex++;
358  				if (subcmd[0] == 'n' && curIndex == reqIndex) {
359  					const char *node_name;
360  
361  					node_name = fdt_get_name(working_fdt,
362  								 nextNodeOffset,
363  								 NULL);
364  					env_set(var, node_name);
365  					return 0;
366  				}
367  				nextNodeOffset = fdt_next_node(
368  					working_fdt, nextNodeOffset, &curDepth);
369  				if (nextNodeOffset < 0)
370  					break;
371  			}
372  			if (subcmd[0] == 's') {
373  				/* get the num nodes at this level */
374  				env_set_ulong(var, curIndex + 1);
375  			} else {
376  				/* node index not found */
377  				printf("libfdt node not found\n");
378  				return 1;
379  			}
380  		} else {
381  			nodep = fdt_getprop(
382  				working_fdt, nodeoffset, prop, &len);
383  			if (len == 0) {
384  				/* no property value */
385  				env_set(var, "");
386  				return 0;
387  			} else if (nodep && len > 0) {
388  				if (subcmd[0] == 'v') {
389  					int ret;
390  
391  					ret = fdt_value_env_set(nodep, len,
392  								var);
393  					if (ret != 0)
394  						return ret;
395  				} else if (subcmd[0] == 'a') {
396  					/* Get address */
397  					char buf[11];
398  
399  					sprintf(buf, "0x%p", nodep);
400  					env_set(var, buf);
401  				} else if (subcmd[0] == 's') {
402  					/* Get size */
403  					char buf[11];
404  
405  					sprintf(buf, "0x%08X", len);
406  					env_set(var, buf);
407  				} else
408  					return CMD_RET_USAGE;
409  				return 0;
410  			} else {
411  				printf("libfdt fdt_getprop(): %s\n",
412  					fdt_strerror(len));
413  				return 1;
414  			}
415  		}
416  
417  	/*
418  	 * Print (recursive) / List (single level)
419  	 */
420  	} else if ((argv[1][0] == 'p') || (argv[1][0] == 'l')) {
421  		int depth = MAX_LEVEL;	/* how deep to print */
422  		char *pathp;		/* path */
423  		char *prop;		/* property */
424  		int  ret;		/* return value */
425  		static char root[2] = "/";
426  
427  		/*
428  		 * list is an alias for print, but limited to 1 level
429  		 */
430  		if (argv[1][0] == 'l') {
431  			depth = 1;
432  		}
433  
434  		/*
435  		 * Get the starting path.  The root node is an oddball,
436  		 * the offset is zero and has no name.
437  		 */
438  		if (argc == 2)
439  			pathp = root;
440  		else
441  			pathp = argv[2];
442  		if (argc > 3)
443  			prop = argv[3];
444  		else
445  			prop = NULL;
446  
447  		ret = fdt_print(pathp, prop, depth);
448  		if (ret != 0)
449  			return ret;
450  
451  	/*
452  	 * Remove a property/node
453  	 */
454  	} else if (strncmp(argv[1], "rm", 2) == 0) {
455  		int  nodeoffset;	/* node offset from libfdt */
456  		int  err;
457  
458  		/*
459  		 * Get the path.  The root node is an oddball, the offset
460  		 * is zero and has no name.
461  		 */
462  		nodeoffset = fdt_path_offset (working_fdt, argv[2]);
463  		if (nodeoffset < 0) {
464  			/*
465  			 * Not found or something else bad happened.
466  			 */
467  			printf ("libfdt fdt_path_offset() returned %s\n",
468  				fdt_strerror(nodeoffset));
469  			return 1;
470  		}
471  		/*
472  		 * Do the delete.  A fourth parameter means delete a property,
473  		 * otherwise delete the node.
474  		 */
475  		if (argc > 3) {
476  			err = fdt_delprop(working_fdt, nodeoffset, argv[3]);
477  			if (err < 0) {
478  				printf("libfdt fdt_delprop():  %s\n",
479  					fdt_strerror(err));
480  				return err;
481  			}
482  		} else {
483  			err = fdt_del_node(working_fdt, nodeoffset);
484  			if (err < 0) {
485  				printf("libfdt fdt_del_node():  %s\n",
486  					fdt_strerror(err));
487  				return err;
488  			}
489  		}
490  
491  	/*
492  	 * Display header info
493  	 */
494  	} else if (argv[1][0] == 'h') {
495  		u32 version = fdt_version(working_fdt);
496  		printf("magic:\t\t\t0x%x\n", fdt_magic(working_fdt));
497  		printf("totalsize:\t\t0x%x (%d)\n", fdt_totalsize(working_fdt),
498  		       fdt_totalsize(working_fdt));
499  		printf("off_dt_struct:\t\t0x%x\n",
500  		       fdt_off_dt_struct(working_fdt));
501  		printf("off_dt_strings:\t\t0x%x\n",
502  		       fdt_off_dt_strings(working_fdt));
503  		printf("off_mem_rsvmap:\t\t0x%x\n",
504  		       fdt_off_mem_rsvmap(working_fdt));
505  		printf("version:\t\t%d\n", version);
506  		printf("last_comp_version:\t%d\n",
507  		       fdt_last_comp_version(working_fdt));
508  		if (version >= 2)
509  			printf("boot_cpuid_phys:\t0x%x\n",
510  				fdt_boot_cpuid_phys(working_fdt));
511  		if (version >= 3)
512  			printf("size_dt_strings:\t0x%x\n",
513  				fdt_size_dt_strings(working_fdt));
514  		if (version >= 17)
515  			printf("size_dt_struct:\t\t0x%x\n",
516  				fdt_size_dt_struct(working_fdt));
517  		printf("number mem_rsv:\t\t0x%x\n",
518  		       fdt_num_mem_rsv(working_fdt));
519  		printf("\n");
520  
521  	/*
522  	 * Set boot cpu id
523  	 */
524  	} else if (strncmp(argv[1], "boo", 3) == 0) {
525  		unsigned long tmp = simple_strtoul(argv[2], NULL, 16);
526  		fdt_set_boot_cpuid_phys(working_fdt, tmp);
527  
528  	/*
529  	 * memory command
530  	 */
531  	} else if (strncmp(argv[1], "me", 2) == 0) {
532  		uint64_t addr, size;
533  		int err;
534  		addr = simple_strtoull(argv[2], NULL, 16);
535  		size = simple_strtoull(argv[3], NULL, 16);
536  		err = fdt_fixup_memory(working_fdt, addr, size);
537  		if (err < 0)
538  			return err;
539  
540  	/*
541  	 * mem reserve commands
542  	 */
543  	} else if (strncmp(argv[1], "rs", 2) == 0) {
544  		if (argv[2][0] == 'p') {
545  			uint64_t addr, size;
546  			int total = fdt_num_mem_rsv(working_fdt);
547  			int j, err;
548  			printf("index\t\t   start\t\t    size\n");
549  			printf("-------------------------------"
550  				"-----------------\n");
551  			for (j = 0; j < total; j++) {
552  				err = fdt_get_mem_rsv(working_fdt, j, &addr, &size);
553  				if (err < 0) {
554  					printf("libfdt fdt_get_mem_rsv():  %s\n",
555  							fdt_strerror(err));
556  					return err;
557  				}
558  				printf("    %x\t%08x%08x\t%08x%08x\n", j,
559  					(u32)(addr >> 32),
560  					(u32)(addr & 0xffffffff),
561  					(u32)(size >> 32),
562  					(u32)(size & 0xffffffff));
563  			}
564  		} else if (argv[2][0] == 'a') {
565  			uint64_t addr, size;
566  			int err;
567  			addr = simple_strtoull(argv[3], NULL, 16);
568  			size = simple_strtoull(argv[4], NULL, 16);
569  			err = fdt_add_mem_rsv(working_fdt, addr, size);
570  
571  			if (err < 0) {
572  				printf("libfdt fdt_add_mem_rsv():  %s\n",
573  					fdt_strerror(err));
574  				return err;
575  			}
576  		} else if (argv[2][0] == 'd') {
577  			unsigned long idx = simple_strtoul(argv[3], NULL, 16);
578  			int err = fdt_del_mem_rsv(working_fdt, idx);
579  
580  			if (err < 0) {
581  				printf("libfdt fdt_del_mem_rsv():  %s\n",
582  					fdt_strerror(err));
583  				return err;
584  			}
585  		} else {
586  			/* Unrecognized command */
587  			return CMD_RET_USAGE;
588  		}
589  	}
590  #ifdef CONFIG_OF_BOARD_SETUP
591  	/* Call the board-specific fixup routine */
592  	else if (strncmp(argv[1], "boa", 3) == 0) {
593  		int err = ft_board_setup(working_fdt, gd->bd);
594  
595  		if (err) {
596  			printf("Failed to update board information in FDT: %s\n",
597  			       fdt_strerror(err));
598  			return CMD_RET_FAILURE;
599  		}
600  	}
601  #endif
602  	/* Create a chosen node */
603  	else if (strncmp(argv[1], "cho", 3) == 0) {
604  		unsigned long initrd_start = 0, initrd_end = 0;
605  
606  		if ((argc != 2) && (argc != 4))
607  			return CMD_RET_USAGE;
608  
609  		if (argc == 4) {
610  			initrd_start = simple_strtoul(argv[2], NULL, 16);
611  			initrd_end = simple_strtoul(argv[3], NULL, 16);
612  		}
613  
614  		fdt_chosen(working_fdt);
615  		fdt_initrd(working_fdt, initrd_start, initrd_end);
616  
617  #if defined(CONFIG_FIT_SIGNATURE)
618  	} else if (strncmp(argv[1], "che", 3) == 0) {
619  		int cfg_noffset;
620  		int ret;
621  		unsigned long addr;
622  		struct fdt_header *blob;
623  
624  		if (!working_fdt)
625  			return CMD_RET_FAILURE;
626  
627  		if (argc > 2) {
628  			addr = simple_strtoul(argv[2], NULL, 16);
629  			blob = map_sysmem(addr, 0);
630  		} else {
631  			blob = (struct fdt_header *)gd->fdt_blob;
632  		}
633  		if (!fdt_valid(&blob))
634  			return 1;
635  
636  		gd->fdt_blob = blob;
637  		cfg_noffset = fit_conf_get_node(working_fdt, NULL);
638  		if (!cfg_noffset) {
639  			printf("Could not find configuration node: %s\n",
640  			       fdt_strerror(cfg_noffset));
641  			return CMD_RET_FAILURE;
642  		}
643  
644  		ret = fit_config_verify(working_fdt, cfg_noffset);
645  		if (ret == 0)
646  			return CMD_RET_SUCCESS;
647  		else
648  			return CMD_RET_FAILURE;
649  #endif
650  
651  	}
652  #ifdef CONFIG_OF_LIBFDT_OVERLAY
653  	/* apply an overlay */
654  	else if (strncmp(argv[1], "ap", 2) == 0) {
655  		unsigned long addr;
656  		struct fdt_header *blob;
657  		int ret;
658  
659  		if (argc != 3)
660  			return CMD_RET_USAGE;
661  
662  		if (!working_fdt)
663  			return CMD_RET_FAILURE;
664  
665  		addr = simple_strtoul(argv[2], NULL, 16);
666  		blob = map_sysmem(addr, 0);
667  		if (!fdt_valid(&blob))
668  			return CMD_RET_FAILURE;
669  
670  		/* apply method prints messages on error */
671  		ret = fdt_overlay_apply_verbose(working_fdt, blob);
672  		if (ret)
673  			return CMD_RET_FAILURE;
674  	}
675  #endif
676  	/* resize the fdt */
677  	else if (strncmp(argv[1], "re", 2) == 0) {
678  		uint extrasize;
679  		if (argc > 2)
680  			extrasize = simple_strtoul(argv[2], NULL, 16);
681  		else
682  			extrasize = 0;
683  		fdt_shrink_to_minimum(working_fdt, extrasize);
684  	}
685  	else {
686  		/* Unrecognized command */
687  		return CMD_RET_USAGE;
688  	}
689  
690  	return 0;
691  }
692  
693  /****************************************************************************/
694  
695  /**
696   * fdt_valid() - Check if an FDT is valid. If not, change it to NULL
697   *
698   * @blobp: Pointer to FDT pointer
699   * @return 1 if OK, 0 if bad (in which case *blobp is set to NULL)
700   */
701  static int fdt_valid(struct fdt_header **blobp)
702  {
703  	const void *blob = *blobp;
704  	int err;
705  
706  	if (blob == NULL) {
707  		printf ("The address of the fdt is invalid (NULL).\n");
708  		return 0;
709  	}
710  
711  	err = fdt_check_header(blob);
712  	if (err == 0)
713  		return 1;	/* valid */
714  
715  	if (err < 0) {
716  		printf("libfdt fdt_check_header(): %s", fdt_strerror(err));
717  		/*
718  		 * Be more informative on bad version.
719  		 */
720  		if (err == -FDT_ERR_BADVERSION) {
721  			if (fdt_version(blob) <
722  			    FDT_FIRST_SUPPORTED_VERSION) {
723  				printf (" - too old, fdt %d < %d",
724  					fdt_version(blob),
725  					FDT_FIRST_SUPPORTED_VERSION);
726  			}
727  			if (fdt_last_comp_version(blob) >
728  			    FDT_LAST_SUPPORTED_VERSION) {
729  				printf (" - too new, fdt %d > %d",
730  					fdt_version(blob),
731  					FDT_LAST_SUPPORTED_VERSION);
732  			}
733  		}
734  		printf("\n");
735  		*blobp = NULL;
736  		return 0;
737  	}
738  	return 1;
739  }
740  
741  /****************************************************************************/
742  
743  /*
744   * Parse the user's input, partially heuristic.  Valid formats:
745   * <0x00112233 4 05>	- an array of cells.  Numbers follow standard
746   *			C conventions.
747   * [00 11 22 .. nn] - byte stream
748   * "string"	- If the the value doesn't start with "<" or "[", it is
749   *			treated as a string.  Note that the quotes are
750   *			stripped by the parser before we get the string.
751   * newval: An array of strings containing the new property as specified
752   *	on the command line
753   * count: The number of strings in the array
754   * data: A bytestream to be placed in the property
755   * len: The length of the resulting bytestream
756   */
757  static int fdt_parse_prop(char * const *newval, int count, char *data, int *len)
758  {
759  	char *cp;		/* temporary char pointer */
760  	char *newp;		/* temporary newval char pointer */
761  	unsigned long tmp;	/* holds converted values */
762  	int stridx = 0;
763  
764  	*len = 0;
765  	newp = newval[0];
766  
767  	/* An array of cells */
768  	if (*newp == '<') {
769  		newp++;
770  		while ((*newp != '>') && (stridx < count)) {
771  			/*
772  			 * Keep searching until we find that last ">"
773  			 * That way users don't have to escape the spaces
774  			 */
775  			if (*newp == '\0') {
776  				newp = newval[++stridx];
777  				continue;
778  			}
779  
780  			cp = newp;
781  			tmp = simple_strtoul(cp, &newp, 0);
782  			if (*cp != '?')
783  				*(fdt32_t *)data = cpu_to_fdt32(tmp);
784  			else
785  				newp++;
786  
787  			data  += 4;
788  			*len += 4;
789  
790  			/* If the ptr didn't advance, something went wrong */
791  			if ((newp - cp) <= 0) {
792  				printf("Sorry, I could not convert \"%s\"\n",
793  					cp);
794  				return 1;
795  			}
796  
797  			while (*newp == ' ')
798  				newp++;
799  		}
800  
801  		if (*newp != '>') {
802  			printf("Unexpected character '%c'\n", *newp);
803  			return 1;
804  		}
805  	} else if (*newp == '[') {
806  		/*
807  		 * Byte stream.  Convert the values.
808  		 */
809  		newp++;
810  		while ((stridx < count) && (*newp != ']')) {
811  			while (*newp == ' ')
812  				newp++;
813  			if (*newp == '\0') {
814  				newp = newval[++stridx];
815  				continue;
816  			}
817  			if (!isxdigit(*newp))
818  				break;
819  			tmp = simple_strtoul(newp, &newp, 16);
820  			*data++ = tmp & 0xFF;
821  			*len    = *len + 1;
822  		}
823  		if (*newp != ']') {
824  			printf("Unexpected character '%c'\n", *newp);
825  			return 1;
826  		}
827  	} else {
828  		/*
829  		 * Assume it is one or more strings.  Copy it into our
830  		 * data area for convenience (including the
831  		 * terminating '\0's).
832  		 */
833  		while (stridx < count) {
834  			size_t length = strlen(newp) + 1;
835  			strcpy(data, newp);
836  			data += length;
837  			*len += length;
838  			newp = newval[++stridx];
839  		}
840  	}
841  	return 0;
842  }
843  
844  /****************************************************************************/
845  
846  /*
847   * Heuristic to guess if this is a string or concatenated strings.
848   */
849  
850  static int is_printable_string(const void *data, int len)
851  {
852  	const char *s = data;
853  
854  	/* zero length is not */
855  	if (len == 0)
856  		return 0;
857  
858  	/* must terminate with zero or '\n' */
859  	if (s[len - 1] != '\0' && s[len - 1] != '\n')
860  		return 0;
861  
862  	/* printable or a null byte (concatenated strings) */
863  	while (((*s == '\0') || isprint(*s) || isspace(*s)) && (len > 0)) {
864  		/*
865  		 * If we see a null, there are three possibilities:
866  		 * 1) If len == 1, it is the end of the string, printable
867  		 * 2) Next character also a null, not printable.
868  		 * 3) Next character not a null, continue to check.
869  		 */
870  		if (s[0] == '\0') {
871  			if (len == 1)
872  				return 1;
873  			if (s[1] == '\0')
874  				return 0;
875  		}
876  		s++;
877  		len--;
878  	}
879  
880  	/* Not the null termination, or not done yet: not printable */
881  	if (*s != '\0' || (len != 0))
882  		return 0;
883  
884  	return 1;
885  }
886  
887  
888  /*
889   * Print the property in the best format, a heuristic guess.  Print as
890   * a string, concatenated strings, a byte, word, double word, or (if all
891   * else fails) it is printed as a stream of bytes.
892   */
893  static void print_data(const void *data, int len)
894  {
895  	int j;
896  
897  	/* no data, don't print */
898  	if (len == 0)
899  		return;
900  
901  	/*
902  	 * It is a string, but it may have multiple strings (embedded '\0's).
903  	 */
904  	if (is_printable_string(data, len)) {
905  		puts("\"");
906  		j = 0;
907  		while (j < len) {
908  			if (j > 0)
909  				puts("\", \"");
910  			puts(data);
911  			j    += strlen(data) + 1;
912  			data += strlen(data) + 1;
913  		}
914  		puts("\"");
915  		return;
916  	}
917  
918  	if ((len %4) == 0) {
919  		if (len > CMD_FDT_MAX_DUMP)
920  			printf("* 0x%p [0x%08x]", data, len);
921  		else {
922  			const __be32 *p;
923  
924  			printf("<");
925  			for (j = 0, p = data; j < len/4; j++)
926  				printf("0x%08x%s", fdt32_to_cpu(p[j]),
927  					j < (len/4 - 1) ? " " : "");
928  			printf(">");
929  		}
930  	} else { /* anything else... hexdump */
931  		if (len > CMD_FDT_MAX_DUMP)
932  			printf("* 0x%p [0x%08x]", data, len);
933  		else {
934  			const u8 *s;
935  
936  			printf("[");
937  			for (j = 0, s = data; j < len; j++)
938  				printf("%02x%s", s[j], j < len - 1 ? " " : "");
939  			printf("]");
940  		}
941  	}
942  }
943  
944  /****************************************************************************/
945  
946  /*
947   * Recursively print (a portion of) the working_fdt.  The depth parameter
948   * determines how deeply nested the fdt is printed.
949   */
950  static int fdt_print(const char *pathp, char *prop, int depth)
951  {
952  	static char tabs[MAX_LEVEL+1] =
953  		"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t"
954  		"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
955  	const void *nodep;	/* property node pointer */
956  	int  nodeoffset;	/* node offset from libfdt */
957  	int  nextoffset;	/* next node offset from libfdt */
958  	uint32_t tag;		/* tag */
959  	int  len;		/* length of the property */
960  	int  level = 0;		/* keep track of nesting level */
961  	const struct fdt_property *fdt_prop;
962  
963  	nodeoffset = fdt_path_offset (working_fdt, pathp);
964  	if (nodeoffset < 0) {
965  		/*
966  		 * Not found or something else bad happened.
967  		 */
968  		printf ("libfdt fdt_path_offset() returned %s\n",
969  			fdt_strerror(nodeoffset));
970  		return 1;
971  	}
972  	/*
973  	 * The user passed in a property as well as node path.
974  	 * Print only the given property and then return.
975  	 */
976  	if (prop) {
977  		nodep = fdt_getprop (working_fdt, nodeoffset, prop, &len);
978  		if (len == 0) {
979  			/* no property value */
980  			printf("%s %s\n", pathp, prop);
981  			return 0;
982  		} else if (nodep && len > 0) {
983  			printf("%s = ", prop);
984  			print_data (nodep, len);
985  			printf("\n");
986  			return 0;
987  		} else {
988  			printf ("libfdt fdt_getprop(): %s\n",
989  				fdt_strerror(len));
990  			return 1;
991  		}
992  	}
993  
994  	/*
995  	 * The user passed in a node path and no property,
996  	 * print the node and all subnodes.
997  	 */
998  	while(level >= 0) {
999  		tag = fdt_next_tag(working_fdt, nodeoffset, &nextoffset);
1000  		switch(tag) {
1001  		case FDT_BEGIN_NODE:
1002  			pathp = fdt_get_name(working_fdt, nodeoffset, NULL);
1003  			if (level <= depth) {
1004  				if (pathp == NULL)
1005  					pathp = "/* NULL pointer error */";
1006  				if (*pathp == '\0')
1007  					pathp = "/";	/* root is nameless */
1008  				printf("%s%s {\n",
1009  					&tabs[MAX_LEVEL - level], pathp);
1010  			}
1011  			level++;
1012  			if (level >= MAX_LEVEL) {
1013  				printf("Nested too deep, aborting.\n");
1014  				return 1;
1015  			}
1016  			break;
1017  		case FDT_END_NODE:
1018  			level--;
1019  			if (level <= depth)
1020  				printf("%s};\n", &tabs[MAX_LEVEL - level]);
1021  			if (level == 0) {
1022  				level = -1;		/* exit the loop */
1023  			}
1024  			break;
1025  		case FDT_PROP:
1026  			fdt_prop = fdt_offset_ptr(working_fdt, nodeoffset,
1027  					sizeof(*fdt_prop));
1028  			pathp    = fdt_string(working_fdt,
1029  					fdt32_to_cpu(fdt_prop->nameoff));
1030  			len      = fdt32_to_cpu(fdt_prop->len);
1031  			nodep    = fdt_prop->data;
1032  			if (len < 0) {
1033  				printf ("libfdt fdt_getprop(): %s\n",
1034  					fdt_strerror(len));
1035  				return 1;
1036  			} else if (len == 0) {
1037  				/* the property has no value */
1038  				if (level <= depth)
1039  					printf("%s%s;\n",
1040  						&tabs[MAX_LEVEL - level],
1041  						pathp);
1042  			} else {
1043  				if (level <= depth) {
1044  					printf("%s%s = ",
1045  						&tabs[MAX_LEVEL - level],
1046  						pathp);
1047  					print_data (nodep, len);
1048  					printf(";\n");
1049  				}
1050  			}
1051  			break;
1052  		case FDT_NOP:
1053  			printf("%s/* NOP */\n", &tabs[MAX_LEVEL - level]);
1054  			break;
1055  		case FDT_END:
1056  			return 1;
1057  		default:
1058  			if (level <= depth)
1059  				printf("Unknown tag 0x%08X\n", tag);
1060  			return 1;
1061  		}
1062  		nodeoffset = nextoffset;
1063  	}
1064  	return 0;
1065  }
1066  
1067  /********************************************************************/
1068  #ifdef CONFIG_SYS_LONGHELP
1069  static char fdt_help_text[] =
1070  	"addr [-c]  <addr> [<length>]   - Set the [control] fdt location to <addr>\n"
1071  #ifdef CONFIG_OF_LIBFDT_OVERLAY
1072  	"fdt apply <addr>                    - Apply overlay to the DT\n"
1073  #endif
1074  #ifdef CONFIG_OF_BOARD_SETUP
1075  	"fdt boardsetup                      - Do board-specific set up\n"
1076  #endif
1077  #ifdef CONFIG_OF_SYSTEM_SETUP
1078  	"fdt systemsetup                     - Do system-specific set up\n"
1079  #endif
1080  	"fdt move   <fdt> <newaddr> <length> - Copy the fdt to <addr> and make it active\n"
1081  	"fdt resize [<extrasize>]            - Resize fdt to size + padding to 4k addr + some optional <extrasize> if needed\n"
1082  	"fdt print  <path> [<prop>]          - Recursive print starting at <path>\n"
1083  	"fdt list   <path> [<prop>]          - Print one level starting at <path>\n"
1084  	"fdt get value <var> <path> <prop>   - Get <property> and store in <var>\n"
1085  	"fdt get name <var> <path> <index>   - Get name of node <index> and store in <var>\n"
1086  	"fdt get addr <var> <path> <prop>    - Get start address of <property> and store in <var>\n"
1087  	"fdt get size <var> <path> [<prop>]  - Get size of [<property>] or num nodes and store in <var>\n"
1088  	"fdt set    <path> <prop> [<val>]    - Set <property> [to <val>]\n"
1089  	"fdt mknode <path> <node>            - Create a new node after <path>\n"
1090  	"fdt rm     <path> [<prop>]          - Delete the node or <property>\n"
1091  	"fdt header                          - Display header info\n"
1092  	"fdt bootcpu <id>                    - Set boot cpuid\n"
1093  	"fdt memory <addr> <size>            - Add/Update memory node\n"
1094  	"fdt rsvmem print                    - Show current mem reserves\n"
1095  	"fdt rsvmem add <addr> <size>        - Add a mem reserve\n"
1096  	"fdt rsvmem delete <index>           - Delete a mem reserves\n"
1097  	"fdt chosen [<start> <end>]          - Add/update the /chosen branch in the tree\n"
1098  	"                                        <start>/<end> - initrd start/end addr\n"
1099  #if defined(CONFIG_FIT_SIGNATURE)
1100  	"fdt checksign [<addr>]              - check FIT signature\n"
1101  	"                                        <start> - addr of key blob\n"
1102  	"                                                  default gd->fdt_blob\n"
1103  #endif
1104  	"NOTE: Dereference aliases by omitting the leading '/', "
1105  		"e.g. fdt print ethernet0.";
1106  #endif
1107  
1108  U_BOOT_CMD(
1109  	fdt,	255,	0,	do_fdt,
1110  	"flattened device tree utility commands", fdt_help_text
1111  );
1112