help with elf to hex conversion

We are moving from a parallel flash which is mapped to the address
space of the processor to a serial flash, which requires the code to be
copied
from sflash to internal RAM before the loader jumps to its entry point.
The ROM loader is very simple: it merely copies the bytes to a location
which is defined in a header at offset zero of the serial flash.  I
created a linker directives
file to locate .text, .rodata, .data, .bss to internal RAM and created
a custom literals section for the flash header.

I was able to create the ELF file without problems and converted to
intel hex format using ghexfile (green hills). The next step was to
feed the hex file to a utility which calculates the checksum, but this
stage failed because it complained the data sections were bound
to an address which was greater than the size of the flash.

I am trying to understand the parameters of the the ghexfile utility,
because I suspect the error was made at the hex file creation.
There are two parameters -start and -romaddr whose description seem to
be very confusing to me.

Any help understanding the elf to hex conversion and the meaning of the
above parameters is much appreciated.