Hi all, I'm not sure if I found a bug or if I mis-use libfdt. I have a valid Linux device tree in memory and want to recursively scan thru it. The device tree contains a root node and several subnodes. First, I start with the root node: int root = fdt_next_node(fdt, -1, NULL); Here, root is set to 0. Now I determine the offset of the first sub node: int subnode = fdt_first_subnode(fdt, root); Here, subnode is either 0 if FDT_ASSUME_MASK contains ASSUME_VALID_INPUT or 164 (in my case) if FDT_ASSUME_MASK does not contain ASSUME_VALID_INPUT. As far as I understand, fdt_first_subnode() should not return the node offset of the current node if there are subnodes available. I think the problem origins at fdt_check_node_offset_() in fdt.c: If VALID_INPUT is set, the whole code in that function is skipped. If that flag is not set then fdt_next_tag(fdt, offset, &offset) is called and the resulting 'offset' is returned. In other words, fdt_check_node_offset_() has a side effect which depends on the VALID_INPUT flag. Thanks! Frank
