Endian problem

Motorola byte order

struct ipac_idProm {
    uchar_t pad00;
    uchar_t asciiI;
    uchar_t pad02;
    ...
};

Intel byte order

struct ipac_idProm {
    uchar_t asciiI;
    uchar_t pad01;
    uchar_t asciiP;
    ...
};

Simple solution, works for both architectures:

struct ipac_idProm {
    ushort_t asciiI;
    ushort_t asciiP;
    ...
};

The code now has to mask off the top 8 bits of each short, but this produces a cleaner solution overall. Module drivers will need similar changes to port them to the PC architecture.