2 * Functions for working with the Flattened Device Tree data format
4 * Copyright 2009 Benjamin Herrenschmidt, IBM Corp
5 * benh@kernel.crashing.org
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * version 2 as published by the Free Software Foundation.
12 #include <linux/kernel.h>
13 #include <linux/initrd.h>
14 #include <linux/module.h>
16 #include <linux/of_fdt.h>
17 #include <linux/of_reserved_mem.h>
18 #include <linux/sizes.h>
19 #include <linux/string.h>
20 #include <linux/errno.h>
21 #include <linux/slab.h>
22 #include <linux/memblock.h>
24 #include <asm/setup.h> /* for COMMAND_LINE_SIZE */
26 #include <asm/machdep.h>
27 #endif /* CONFIG_PPC */
31 char *of_fdt_get_string(struct boot_param_header *blob, u32 offset)
33 return ((char *)blob) +
34 be32_to_cpu(blob->off_dt_strings) + offset;
38 * of_fdt_get_property - Given a node in the given flat blob, return
41 void *of_fdt_get_property(struct boot_param_header *blob,
42 unsigned long node, const char *name,
45 unsigned long p = node;
48 u32 tag = be32_to_cpup((__be32 *)p);
55 if (tag != OF_DT_PROP)
58 sz = be32_to_cpup((__be32 *)p);
59 noff = be32_to_cpup((__be32 *)(p + 4));
61 if (be32_to_cpu(blob->version) < 0x10)
62 p = ALIGN(p, sz >= 8 ? 8 : 4);
64 nstr = of_fdt_get_string(blob, noff);
66 pr_warning("Can't find property index name !\n");
69 if (strcmp(name, nstr) == 0) {
80 * of_fdt_is_compatible - Return true if given node from the given blob has
81 * compat in its compatible list
82 * @blob: A device tree blob
84 * @compat: compatible string to compare with compatible list.
86 * On match, returns a non-zero value with smaller values returned for more
87 * specific compatible values.
89 int of_fdt_is_compatible(struct boot_param_header *blob,
90 unsigned long node, const char *compat)
93 unsigned long cplen, l, score = 0;
95 cp = of_fdt_get_property(blob, node, "compatible", &cplen);
100 if (of_compat_cmp(cp, compat, strlen(compat)) == 0)
111 * of_fdt_match - Return true if node matches a list of compatible values
113 int of_fdt_match(struct boot_param_header *blob, unsigned long node,
114 const char *const *compat)
116 unsigned int tmp, score = 0;
122 tmp = of_fdt_is_compatible(blob, node, *compat);
123 if (tmp && (score == 0 || (tmp < score)))
131 static void *unflatten_dt_alloc(unsigned long *mem, unsigned long size,
136 *mem = ALIGN(*mem, align);
144 * unflatten_dt_node - Alloc and populate a device_node from the flat tree
145 * @blob: The parent device tree blob
146 * @mem: Memory chunk to use for allocating device nodes and properties
147 * @p: pointer to node in flat tree
148 * @dad: Parent struct device_node
149 * @allnextpp: pointer to ->allnext from last allocated device_node
150 * @fpsize: Size of the node path up at the current depth.
152 static unsigned long unflatten_dt_node(struct boot_param_header *blob,
155 struct device_node *dad,
156 struct device_node ***allnextpp,
157 unsigned long fpsize)
159 struct device_node *np;
160 struct property *pp, **prev_pp = NULL;
163 unsigned int l, allocl;
167 tag = be32_to_cpup((__be32 *)(*p));
168 if (tag != OF_DT_BEGIN_NODE) {
169 pr_err("Weird tag at start of node: %x\n", tag);
174 l = allocl = strlen(pathp) + 1;
175 *p = ALIGN(*p + l, 4);
177 /* version 0x10 has a more compact unit name here instead of the full
178 * path. we accumulate the full path size using "fpsize", we'll rebuild
179 * it later. We detect this because the first character of the name is
182 if ((*pathp) != '/') {
185 /* root node: special case. fpsize accounts for path
186 * plus terminating zero. root node only has '/', so
187 * fpsize should be 2, but we want to avoid the first
188 * level nodes to have two '/' so we use fpsize 1 here
195 /* account for '/' and path size minus terminal 0
203 np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
204 __alignof__(struct device_node));
207 memset(np, 0, sizeof(*np));
208 np->full_name = fn = ((char *)np) + sizeof(*np);
210 /* rebuild full path for new format */
211 if (dad && dad->parent) {
212 strcpy(fn, dad->full_name);
214 if ((strlen(fn) + l + 1) != allocl) {
215 pr_debug("%s: p: %d, l: %d, a: %d\n",
216 pathp, (int)strlen(fn),
224 memcpy(fn, pathp, l);
226 prev_pp = &np->properties;
228 *allnextpp = &np->allnext;
231 /* we temporarily use the next field as `last_child'*/
232 if (dad->next == NULL)
235 dad->next->sibling = np;
238 kref_init(&np->kref);
240 /* process properties */
245 tag = be32_to_cpup((__be32 *)(*p));
246 if (tag == OF_DT_NOP) {
250 if (tag != OF_DT_PROP)
253 sz = be32_to_cpup((__be32 *)(*p));
254 noff = be32_to_cpup((__be32 *)((*p) + 4));
256 if (be32_to_cpu(blob->version) < 0x10)
257 *p = ALIGN(*p, sz >= 8 ? 8 : 4);
259 pname = of_fdt_get_string(blob, noff);
261 pr_info("Can't find property name in list !\n");
264 if (strcmp(pname, "name") == 0)
266 l = strlen(pname) + 1;
267 pp = unflatten_dt_alloc(&mem, sizeof(struct property),
268 __alignof__(struct property));
270 /* We accept flattened tree phandles either in
271 * ePAPR-style "phandle" properties, or the
272 * legacy "linux,phandle" properties. If both
273 * appear and have different values, things
274 * will get weird. Don't do that. */
275 if ((strcmp(pname, "phandle") == 0) ||
276 (strcmp(pname, "linux,phandle") == 0)) {
277 if (np->phandle == 0)
278 np->phandle = be32_to_cpup((__be32*)*p);
280 /* And we process the "ibm,phandle" property
281 * used in pSeries dynamic device tree
283 if (strcmp(pname, "ibm,phandle") == 0)
284 np->phandle = be32_to_cpup((__be32 *)*p);
287 pp->value = (void *)*p;
291 *p = ALIGN((*p) + sz, 4);
293 /* with version 0x10 we may not have the name property, recreate
294 * it here from the unit name if absent
297 char *p1 = pathp, *ps = pathp, *pa = NULL;
310 pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
311 __alignof__(struct property));
318 memcpy(pp->value, ps, sz - 1);
319 ((char *)pp->value)[sz - 1] = 0;
320 pr_debug("fixed up name for %s -> %s\n", pathp,
326 np->name = of_get_property(np, "name", NULL);
327 np->type = of_get_property(np, "device_type", NULL);
334 while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) {
335 if (tag == OF_DT_NOP)
338 mem = unflatten_dt_node(blob, mem, p, np, allnextpp,
340 tag = be32_to_cpup((__be32 *)(*p));
342 if (tag != OF_DT_END_NODE) {
343 pr_err("Weird tag at end of node: %x\n", tag);
351 * __unflatten_device_tree - create tree of device_nodes from flat blob
353 * unflattens a device-tree, creating the
354 * tree of struct device_node. It also fills the "name" and "type"
355 * pointers of the nodes so the normal device-tree walking functions
357 * @blob: The blob to expand
358 * @mynodes: The device_node tree created by the call
359 * @dt_alloc: An allocator that provides a virtual address to memory
360 * for the resulting tree
362 static void __unflatten_device_tree(struct boot_param_header *blob,
363 struct device_node **mynodes,
364 void * (*dt_alloc)(u64 size, u64 align))
366 unsigned long start, mem, size;
367 struct device_node **allnextp = mynodes;
369 pr_debug(" -> unflatten_device_tree()\n");
372 pr_debug("No device tree pointer\n");
376 pr_debug("Unflattening device tree:\n");
377 pr_debug("magic: %08x\n", be32_to_cpu(blob->magic));
378 pr_debug("size: %08x\n", be32_to_cpu(blob->totalsize));
379 pr_debug("version: %08x\n", be32_to_cpu(blob->version));
381 if (be32_to_cpu(blob->magic) != OF_DT_HEADER) {
382 pr_err("Invalid device tree blob header\n");
386 /* First pass, scan for size */
387 start = ((unsigned long)blob) +
388 be32_to_cpu(blob->off_dt_struct);
389 size = unflatten_dt_node(blob, 0, &start, NULL, NULL, 0);
390 size = (size | 3) + 1;
392 pr_debug(" size is %lx, allocating...\n", size);
394 /* Allocate memory for the expanded device tree */
395 mem = (unsigned long)
396 dt_alloc(size + 4, __alignof__(struct device_node));
398 ((__be32 *)mem)[size / 4] = cpu_to_be32(0xdeadbeef);
400 pr_debug(" unflattening %lx...\n", mem);
402 /* Second pass, do actual unflattening */
403 start = ((unsigned long)blob) +
404 be32_to_cpu(blob->off_dt_struct);
405 unflatten_dt_node(blob, mem, &start, NULL, &allnextp, 0);
406 if (be32_to_cpup((__be32 *)start) != OF_DT_END)
407 pr_warning("Weird tag at end of tree: %08x\n", *((u32 *)start));
408 if (be32_to_cpu(((__be32 *)mem)[size / 4]) != 0xdeadbeef)
409 pr_warning("End of tree marker overwritten: %08x\n",
410 be32_to_cpu(((__be32 *)mem)[size / 4]));
413 pr_debug(" <- unflatten_device_tree()\n");
416 static void *kernel_tree_alloc(u64 size, u64 align)
418 return kzalloc(size, GFP_KERNEL);
422 * of_fdt_unflatten_tree - create tree of device_nodes from flat blob
424 * unflattens the device-tree passed by the firmware, creating the
425 * tree of struct device_node. It also fills the "name" and "type"
426 * pointers of the nodes so the normal device-tree walking functions
429 void of_fdt_unflatten_tree(unsigned long *blob,
430 struct device_node **mynodes)
432 struct boot_param_header *device_tree =
433 (struct boot_param_header *)blob;
434 __unflatten_device_tree(device_tree, mynodes, &kernel_tree_alloc);
436 EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
438 /* Everything below here references initial_boot_params directly. */
439 int __initdata dt_root_addr_cells;
440 int __initdata dt_root_size_cells;
442 struct boot_param_header *initial_boot_params;
444 #ifdef CONFIG_OF_EARLY_FLATTREE
447 * res_mem_reserve_reg() - reserve all memory described in 'reg' property
449 static int __init __reserved_mem_reserve_reg(unsigned long node,
452 int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
453 phys_addr_t base, size;
456 int nomap, first = 1;
458 prop = of_get_flat_dt_prop(node, "reg", &len);
462 if (len && len % t_len != 0) {
463 pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n",
468 nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
470 while (len >= t_len) {
471 base = dt_mem_next_cell(dt_root_addr_cells, &prop);
472 size = dt_mem_next_cell(dt_root_size_cells, &prop);
475 early_init_dt_reserve_memory_arch(base, size, nomap) == 0)
476 pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n",
477 uname, &base, (unsigned long)size / SZ_1M);
479 pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n",
480 uname, &base, (unsigned long)size / SZ_1M);
484 fdt_reserved_mem_save_node(node, uname, base, size);
492 * __reserved_mem_check_root() - check if #size-cells, #address-cells provided
493 * in /reserved-memory matches the values supported by the current implementation,
494 * also check if ranges property has been provided
496 static int __init __reserved_mem_check_root(unsigned long node)
500 prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
501 if (!prop || be32_to_cpup(prop) != dt_root_size_cells)
504 prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
505 if (!prop || be32_to_cpup(prop) != dt_root_addr_cells)
508 prop = of_get_flat_dt_prop(node, "ranges", NULL);
515 * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory
517 static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname,
518 int depth, void *data)
524 if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) {
525 if (__reserved_mem_check_root(node) != 0) {
526 pr_err("Reserved memory: unsupported node format, ignoring\n");
536 } else if (found && depth < 2) {
537 /* scanning of /reserved-memory has been finished */
541 status = of_get_flat_dt_prop(node, "status", NULL);
542 if (status && strcmp(status, "okay") != 0 && strcmp(status, "ok") != 0)
545 err = __reserved_mem_reserve_reg(node, uname);
546 if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL))
547 fdt_reserved_mem_save_node(node, uname, 0, 0);
554 * early_init_fdt_scan_reserved_mem() - create reserved memory regions
556 * This function grabs memory from early allocator for device exclusive use
557 * defined in device tree structures. It should be called by arch specific code
558 * once the early allocator (i.e. memblock) has been fully activated.
560 void __init early_init_fdt_scan_reserved_mem(void)
562 if (!initial_boot_params)
565 of_scan_flat_dt(__fdt_scan_reserved_mem, NULL);
566 fdt_init_reserved_mem();
570 * of_scan_flat_dt - scan flattened tree blob and call callback on each.
571 * @it: callback function
572 * @data: context data pointer
574 * This function is used to scan the flattened device-tree, it is
575 * used to extract the memory information at boot before we can
578 int __init of_scan_flat_dt(int (*it)(unsigned long node,
579 const char *uname, int depth,
583 unsigned long p = ((unsigned long)initial_boot_params) +
584 be32_to_cpu(initial_boot_params->off_dt_struct);
589 u32 tag = be32_to_cpup((__be32 *)p);
593 if (tag == OF_DT_END_NODE) {
597 if (tag == OF_DT_NOP)
599 if (tag == OF_DT_END)
601 if (tag == OF_DT_PROP) {
602 u32 sz = be32_to_cpup((__be32 *)p);
604 if (be32_to_cpu(initial_boot_params->version) < 0x10)
605 p = ALIGN(p, sz >= 8 ? 8 : 4);
610 if (tag != OF_DT_BEGIN_NODE) {
611 pr_err("Invalid tag %x in flat device tree!\n", tag);
616 p = ALIGN(p + strlen(pathp) + 1, 4);
618 pathp = kbasename(pathp);
619 rc = it(p, pathp, depth, data);
628 * of_get_flat_dt_root - find the root node in the flat blob
630 unsigned long __init of_get_flat_dt_root(void)
632 unsigned long p = ((unsigned long)initial_boot_params) +
633 be32_to_cpu(initial_boot_params->off_dt_struct);
635 while (be32_to_cpup((__be32 *)p) == OF_DT_NOP)
637 BUG_ON(be32_to_cpup((__be32 *)p) != OF_DT_BEGIN_NODE);
639 return ALIGN(p + strlen((char *)p) + 1, 4);
643 * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr
645 * This function can be used within scan_flattened_dt callback to get
646 * access to properties
648 void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
651 return of_fdt_get_property(initial_boot_params, node, name, size);
655 * of_flat_dt_is_compatible - Return true if given node has compat in compatible list
656 * @node: node to test
657 * @compat: compatible string to compare with compatible list.
659 int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
661 return of_fdt_is_compatible(initial_boot_params, node, compat);
665 * of_flat_dt_match - Return true if node matches a list of compatible values
667 int __init of_flat_dt_match(unsigned long node, const char *const *compat)
669 return of_fdt_match(initial_boot_params, node, compat);
672 struct fdt_scan_status {
677 int (*iterator)(unsigned long node, const char *uname, int depth, void *data);
682 * fdt_scan_node_by_path - iterator for of_scan_flat_dt_by_path function
684 static int __init fdt_scan_node_by_path(unsigned long node, const char *uname,
685 int depth, void *data)
687 struct fdt_scan_status *st = data;
690 * if scan at the requested fdt node has been completed,
691 * return -ENXIO to abort further scanning
693 if (depth <= st->depth)
696 /* requested fdt node has been found, so call iterator function */
698 return st->iterator(node, uname, depth, st->data);
700 /* check if scanning automata is entering next level of fdt nodes */
701 if (depth == st->depth + 1 &&
702 strncmp(st->name, uname, st->namelen) == 0 &&
703 uname[st->namelen] == 0) {
705 if (st->name[st->namelen] == 0) {
708 const char *next = st->name + st->namelen + 1;
710 st->namelen = strcspn(next, "/");
715 /* scan next fdt node */
720 * of_scan_flat_dt_by_path - scan flattened tree blob and call callback on each
721 * child of the given path.
722 * @path: path to start searching for children
723 * @it: callback function
724 * @data: context data pointer
726 * This function is used to scan the flattened device-tree starting from the
727 * node given by path. It is used to extract information (like reserved
728 * memory), which is required on ealy boot before we can unflatten the tree.
730 int __init of_scan_flat_dt_by_path(const char *path,
731 int (*it)(unsigned long node, const char *name, int depth, void *data),
734 struct fdt_scan_status st = {path, 0, -1, 0, it, data};
737 if (initial_boot_params)
738 ret = of_scan_flat_dt(fdt_scan_node_by_path, &st);
742 else if (ret == -ENXIO) /* scan has been completed */
748 #ifdef CONFIG_BLK_DEV_INITRD
750 * early_init_dt_check_for_initrd - Decode initrd location from flat tree
751 * @node: reference to node containing initrd location ('chosen')
753 void __init early_init_dt_check_for_initrd(unsigned long node)
759 pr_debug("Looking for initrd properties... ");
761 prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len);
764 start = of_read_number(prop, len/4);
766 prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);
769 end = of_read_number(prop, len/4);
771 early_init_dt_setup_initrd_arch(start, end);
772 pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n",
773 (unsigned long long)start, (unsigned long long)end);
776 inline void early_init_dt_check_for_initrd(unsigned long node)
779 #endif /* CONFIG_BLK_DEV_INITRD */
782 * early_init_dt_scan_root - fetch the top level address and size cells
784 int __init early_init_dt_scan_root(unsigned long node, const char *uname,
785 int depth, void *data)
792 dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
793 dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
795 prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
797 dt_root_size_cells = be32_to_cpup(prop);
798 pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells);
800 prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
802 dt_root_addr_cells = be32_to_cpup(prop);
803 pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells);
809 u64 __init dt_mem_next_cell(int s, __be32 **cellp)
814 return of_read_number(p, s);
818 * early_init_dt_scan_memory - Look for an parse memory nodes
820 int __init early_init_dt_scan_memory(unsigned long node, const char *uname,
821 int depth, void *data)
823 char *type = of_get_flat_dt_prop(node, "device_type", NULL);
827 /* We are scanning "memory" nodes only */
830 * The longtrail doesn't have a device_type on the
831 * /memory node, so look for the node called /memory@0.
833 if (depth != 1 || strcmp(uname, "memory@0") != 0)
835 } else if (strcmp(type, "memory") != 0)
838 reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
840 reg = of_get_flat_dt_prop(node, "reg", &l);
844 endp = reg + (l / sizeof(__be32));
846 pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
847 uname, l, reg[0], reg[1], reg[2], reg[3]);
849 while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
852 base = dt_mem_next_cell(dt_root_addr_cells, ®);
853 size = dt_mem_next_cell(dt_root_size_cells, ®);
857 pr_debug(" - %llx , %llx\n", (unsigned long long)base,
858 (unsigned long long)size);
860 early_init_dt_add_memory_arch(base, size);
866 int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
867 int depth, void *data)
872 pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
874 if (depth != 1 || !data ||
875 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
878 early_init_dt_check_for_initrd(node);
880 /* Retrieve command line */
881 p = of_get_flat_dt_prop(node, "bootargs", &l);
882 if (p != NULL && l > 0)
883 strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
886 * CONFIG_CMDLINE is meant to be a default in case nothing else
887 * managed to set the command line, unless CONFIG_CMDLINE_FORCE
888 * is set in which case we override whatever was found earlier.
890 #ifdef CONFIG_CMDLINE
891 #ifndef CONFIG_CMDLINE_FORCE
892 if (!((char *)data)[0])
894 strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
895 #endif /* CONFIG_CMDLINE */
897 pr_debug("Command line is: %s\n", (char*)data);
903 #ifdef CONFIG_HAVE_MEMBLOCK
904 void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
906 const u64 phys_offset = __pa(PAGE_OFFSET);
909 if (base + size < phys_offset) {
910 pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
914 if (base < phys_offset) {
915 pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
917 size -= phys_offset - base;
920 memblock_add(base, size);
923 int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
924 phys_addr_t size, bool nomap)
926 if (memblock_is_region_reserved(base, size))
929 return memblock_remove(base, size);
930 return memblock_reserve(base, size);
934 * called from unflatten_device_tree() to bootstrap devicetree itself
935 * Architectures can override this definition if memblock isn't used
937 void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align)
939 return __va(memblock_alloc(size, align));
942 int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
943 phys_addr_t size, bool nomap)
945 pr_err("Reserved memory not supported, ignoring range 0x%llx - 0x%llx%s\n",
946 base, size, nomap ? " (nomap)" : "");
951 bool __init early_init_dt_scan(void *params)
956 /* Setup flat device-tree pointer */
957 initial_boot_params = params;
959 /* check device tree validity */
960 if (be32_to_cpu(initial_boot_params->magic) != OF_DT_HEADER) {
961 initial_boot_params = NULL;
965 /* Retrieve various information from the /chosen node */
966 of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
968 /* Initialize {size,address}-cells info */
969 of_scan_flat_dt(early_init_dt_scan_root, NULL);
971 /* Setup memory, calling early_init_dt_add_memory_arch */
972 of_scan_flat_dt(early_init_dt_scan_memory, NULL);
978 * unflatten_device_tree - create tree of device_nodes from flat blob
980 * unflattens the device-tree passed by the firmware, creating the
981 * tree of struct device_node. It also fills the "name" and "type"
982 * pointers of the nodes so the normal device-tree walking functions
985 void __init unflatten_device_tree(void)
987 __unflatten_device_tree(initial_boot_params, &of_allnodes,
988 early_init_dt_alloc_memory_arch);
990 /* Get pointer to "/chosen" and "/aliasas" nodes for use everywhere */
991 of_alias_scan(early_init_dt_alloc_memory_arch);
994 #endif /* CONFIG_OF_EARLY_FLATTREE */