fdt_setprop_inplace_u32(9)

💅 fdt_setprop_inplace_u32

okay so bestie, welcome to the Kernel API Manual ✨ — this one's a little gem from the device-tree squad and honestly it does exactly one thing and does it slay.

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🌸 NAME

fdt_setprop_inplace_u32 — change the value of a 32-bit integer property 🎀

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🦋 SYNOPSIS

int fdt_setprop_inplace_u32 (void *fdt , int nodeoffset , const char
*name , uint32_t val );

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✨ ARGUMENTS

• fdt — pointer to the device tree blob 🫶 (the whole vibe, the entire tree, your main character)
• nodeoffset — offset of the node whose property to change
• name — name of the property to change
• val — 32-bit integer value to replace the property with 💖

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💜 DESCRIPTION

so fdt_setprop_inplace_u32 replaces the value of a given property with the 32-bit integer value in val, converting val to big-endian if necessary 🔥. lowkey important: this function cannot change the size of a property, so it will only work if the property already exists and has length 4. no resizing, no growth spurts, no new props — it's an in-place glow-up only 💅.

and the cute part: this function will alter only the bytes in the blob which contain the given property value, and will not alter or move any other part of the tree 🌈. surgical. precise. iconic. the rest of the tree doesn't even notice.

ngl this is the "swap the number, touch nothing else" function — if the property's not already exactly 4 bytes, bestie, it's not happening 😭

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🎀 RETURN

• 0 — on success ✨
• -FDT_ERR_NOSPACE — if the property's length is not equal to 4
• -FDT_ERR_NOTFOUND — node does not have the named property
• -FDT_ERR_BADOFFSET — nodeoffset did not point to FDT_BEGIN_NODE tag
• -FDT_ERR_BADMAGIC, -FDT_ERR_BADVERSION, -FDT_ERR_BADSTATE, -FDT_ERR_BADSTRUCTURE, -FDT_ERR_TRUNCATED — standard meanings 💀

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🧚 SEE ALSO

Kernel file ./scripts/dtc/libfdt/libfdt.h 🍓

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_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_string(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)

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okay that's the whole page, no cap 💖 this icon lives in ./scripts/dtc/libfdt, it's dated October 2026, and yes it's fdt_setprop_inplace_u32(9) all the way down. go forth and modify exactly four bytes, bestie 🧚✨🫶