How to load a FS module in solaris with modload

I've built a new FS module with the appropriate functions
and structs (i.e. _init(), ...  struct modlfs, etc ...).
I move the binary to /kernel/fs/sparcv9/my_mod_name
since it is a 64 bit binary and a 64 bit target.
When I run modload:
# modload -p /kernel/fs/sparcv9/my_mod_name
can't load module: No such file or directory
I can't find any docs or info in the writing a DD manual.
Anyone know what I'm doing wrong ???
Thanks.

See /var/adm/messages file for error message from krtld - this message from modload usually indicates some missing symbols in your module.

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