unsigned hwi_find_tag(unsigned start, 
                      int curr_item, 
                      const char *tagname);
Note: Although the hwi_find_tag() function resides in the C library (proto in <hw/sysinfo.h>), the function is still usable from startup programs.

Search for a given tagname in the hwinfo section of startup. The start parameter works just like in hwi_find_item(). If curr_item is nonzero, the tagname must occur within the current item. If zero, the tagname can occur anywhere from the starting point of the search to the end of the section. If the tag can't be found, then HWI_NULL_OFF is returned; otherwise, the byte offset within the hwinfo section is returned.