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Serial BootLoader HEX image split at line 129?

Other Parts Discussed in Thread: REMOTI, CC2530

Im trying to add SBL to my project, Im trying to build HEX image that combines SBL+APP hex, and Im looking at post build command:

"$PROJ_DIR$\..\..\common\cc2530\cc253x_sbl_pp.bat" "$PROJ_DIR$" "ProdHex" "$PROJ_DIR$\CC2533F96-RTM-HEX\Exe\rsa_cc2533F96_rtm" "c:\Texas\sbl\Projects\RemoTI\SerialBoot\CC253x\CC2533F96_UART0_HEX\Exe\sbl_cc2533f96_uart0.hex" "129"

Last parameter "129" is what puzzles me. I see that script is reading first 129 lines of SBL hex file, and places them at the begining of combined hex file. Then after app hex is written, it writes remain of SBL hex at the end of combined hex file.

I thought that whole SBL hex image should go before APP hex. My question is why is it split, and why at line 129?

The same parameter "129" is used for both F64 and F96 configurations, while F64 SBL hex is different and smaller then F96 SBL hex file. How can this work?!!