PCI FCode PROM Header Format is as follows: ————————————————— a.out header 32 bytes (Needed by some utilities) ————————————————— PCI expansion PROM Header 28 bytes ————————————————— PCI data struct. 24 bytes ————————————————— FCode (8 Byte FCode header + FCode code bytes) ————————————————— The above a.out header is also needed if you want to download your FCode image (e.g. during test/development of your FCode driver you may not want to use a physical PROM) using “dload” or “boot” on a Solaris 1.x (SunOS 4.x) system. In case you are “dload”ing or “boot”ing your FCode image on a Solaris 2.x system, you need to replace the a.out header with an ELF header. The fakeboot utility can add either an a.out or an ELF header, based on parameters you pass to fakeboot. The add_hdr utility can also add either an a.out or an ELF head