fdt_appendprop_string(9)

💖 fdt_appendprop_string — the Kernel API Manual, bestie edition 🎀

okay so picture this: you're deep in the device tree blob, right, and you just need to add a string to a property. not replace it, not overwrite it — append. that's literally this function's whole personality. it's giving "yes, and…" energy. ✨

---

🌸 NAME 🌸

fdt_appendprop_string — append a string to a property 💅

---

🦋 SYNOPSIS 🦋

fdt_appendprop_string (fdt , nodeoffset , name , str );

that's it. four things. you got this, bestie. 🫶

---

💜 ARGUMENTS 💜

• fdt — pointer to the device tree blob. the main character of the whole operation, honestly 👑
• nodeoffset — offset of the node whose property to change. like, which node are we touching today 🎀
• name — name of the property to change. yes, that one ✨
• str — string value to append to the property. the new content, the fresh material, the added lore 💖

---

🌈 DESCRIPTION 🌈

so fdt_appendprop_string appends the given string to the value of the named property in the given node — or it creates a brand-new property with that value if it doesn't already exist. no cap, it really does both. two modes, zero drama. 😭

⚠️ okay important thing, listen up: this function may insert data into the blob, and will therefore change the offsets of some existing nodes. so if you were holding onto a nodeoffset like it's your emotional support number… it might be stale now. like, trauma. 💀

---

🔥 RETURN 🔥

• 0 — on success. slay! 🎉
• -FDT_ERR_NOSPACE — there is insufficient free space in the blob to contain the new property value. not enough room, the vibes have nowhere to go 😭
• -FDT_ERR_BADOFFSET — nodeoffset did not point to FDT_BEGIN_NODE tag. wrong address, bestie 🌸
• -FDT_ERR_BADLAYOUT, -FDT_ERR_BADMAGIC, -FDT_ERR_BADVERSION, -FDT_ERR_BADSTATE, -FDT_ERR_BADSTRUCTURE, -FDT_ERR_BADLAYOUT, -FDT_ERR_TRUNCATED — standard meanings. yes, -FDT_ERR_BADLAYOUT is listed twice, and yes, we're reporting that faithfully because the facts are sacred even when the docs are a little extra. 🙈

---

🌟 SEE ALSO 🌟

Kernel file ./scripts/dtc/libfdt/libfdt.h, plus a frankly iconic friend group:

fdt_offset_ptr(9), fdt_next_tag(9), fdt_first_subnode(9), fdt_next_subnode(9), fdt_for_each_subnode(9), fdt_header_size(9), fdt_header_size_(9), fdt_check_header(9), fdt_move(9), fdt_check_full(9), fdt_get_string(9), fdt_string(9), fdt_find_max_phandle(9), fdt_get_max_phandle(9), fdt_generate_phandle(9), fdt_num_mem_rsv(9), fdt_get_mem_rsv(9), fdt_subnode_offset_namelen(9), fdt_subnode_offset(9), fdt_path_offset_namelen(9), fdt_path_offset(9), fdt_get_name(9), fdt_first_property_offset(9), fdt_next_property_offset(9), fdt_for_each_property_offset(9), fdt_get_property_by_offset(9), fdt_get_property_namelen(9), fdt_get_property(9), fdt_getprop_by_offset(9), fdt_getprop_namelen(9), fdt_getprop(9), fdt_get_phandle(9), fdt_get_alias_namelen(9), fdt_get_alias(9), fdt_get_symbol_namelen(9), fdt_get_symbol(9), fdt_get_path(9), fdt_supernode_atdepth_offset(9), fdt_node_depth(9), fdt_parent_offset(9), fdt_node_offset_by_prop_value(9), fdt_node_offset_by_phandle(9), fdt_node_check_compatible(9), fdt_node_offset_by_compatible(9), fdt_stringlist_contains(9), fdt_stringlist_count(9), fdt_stringlist_search(9), fdt_stringlist_get(9), FDT_MAX_NCELLS(9), fdt_address_cells(9), fdt_size_cells(9), fdt_setprop_inplace_namelen_partial(9), fdt_setprop_inplace(9), fdt_setprop_inplace_u32(9), fdt_setprop_inplace_u64(9), fdt_setprop_inplace_cell(9), fdt_nop_property(9), fdt_nop_node(9), fdt_create_with_flags(9), fdt_create(9), fdt_resize(9), fdt_add_reservemap_entry(9), fdt_finish_reservemap(9), fdt_begin_node(9), fdt_property(9), fdt_property_placeholder(9), fdt_end_node(9), fdt_finish(9), fdt_create_empty_tree(9), fdt_open_into(9), fdt_pack(9), fdt_add_mem_rsv(9), fdt_del_mem_rsv(9), fdt_set_name(9), fdt_setprop_namelen(9), fdt_setprop(9), fdt_setprop_placeholder_namelen(9), fdt_setprop_placeholder(9), fdt_setprop_u32(9), fdt_setprop_u64(9), fdt_setprop_cell(9), fdt_setprop_string(9), fdt_setprop_namelen_string(9), fdt_setprop_empty(9), fdt_appendprop(9), fdt_appendprop_u32(9), fdt_appendprop_u64(9), fdt_appendprop_cell(9), fdt_appendprop_addrrange(9), fdt_delprop(9), fdt_add_subnode_namelen(9), fdt_add_subnode(9), fdt_del_node(9), fdt_overlay_apply(9), fdt_overlay_target_offset(9), fdt_strerror(9)

---

and that's the whole page, bestie — go forth and append responsibly 💅✨

this gem lives in ./scripts/dtc/libfdt, dated October 2026, and it's from the fdt_appendprop_string(9) Kernel API Manual. mwah. 🍓💖