elf2ecoff —
convert a NetBSD ELF-format executable to NetBSD ECOFF
  format
  
    | elf2ecoff | elf-file ecoff-file | 
Reads a fully-linked ELF executable (such as a linked kernel) and produces an
  equivalent ECOFF format executable file.
The elf2ecoff utility is used to convert
    native NetBSD ELF binaries to ECOFF format, for
    compatibility with DECstation diskless-boot PROM code and diskless-boot
    servers that require ECOFF format binaries.
elf2ecoff was originally developed for
  NetBSD/pmax by Ted Lemon and was first distributed
  with the pmax port of NetBSD 1.1.
elf2ecoff assumes there are no multiply-referenced
  symbols in the input ELF symbol section. It may be necessary to link with
  -x to avoid duplicate symbols.
In some environments, the GNU binutils
    objcopy(1) utility may be a
    better solution than elf2ecoff.