Tornado Reference : Tornado Utilities
hexDec - convert a.out format object file to Motorola hex records no DEC
hexDec [-a adrs] [-l] [-v] [-p PC] [-s SP] [-b] file
This program generates a Motorola hex format (S-record) file from an a.out format object module. Normally, the entry address in the object module will be used as the starting address of the output module. However, if the -a flag is used, then adrs is used as the starting address. Normally S1 records will be generated for addresses less than 64K; S2 records will be generated for address greater than 64K and less the 16M; and S3 records will be generated for greater than that.
-l generate only S2 records. -a adrs use adrs as the entry address, rather than the address in the object module. -v output vector information at address 0. -p PC use PC as the PC in the vector (meaningless without -v). -s SP use SP as the SP in the vector (meaningless without -v). -b output signature bytes, size, and checksum for additional BIOS ROM.