merge Bootloader and application

[mojtaba_al22]

Hi guys,

I have a Bootloader and application files in project with part of S912G128MLL, and I want to merge and write them in the flash, Please tell me where to start.

TNX

[RadekS]

Hi Mojtaba,

There are more ways how to do it.

The simplest is method is direct editing *.s19 (*.sx) file and copy flash content from one file into another.

You may also use SRecCvt tool for sorting data in the final S-record file.

The next option is including your bootloader S-Rec file into your application project (or opposite) by simple line in *.prm linker file.

For example:

HEXFILE bootloader.s19‍‍

For more details, please check chapter 8 in AN4258

For more details regarding *.prm linker file, please follow "c:\Freescale\CW MCU v11.0\MCU\Help\PDF\MCU_Build_Tools_Utilities.pdf" document. 

I hope it helps you.

Have a great day,
Radek

[mojtaba_al22]

Hi Radek,

*/The simplest is method is direct editing *.s19 (*.sx) file and copy flash content from one file into another.*/

If it's possible please explain this method more.

Thank you for your post. 

Best Regards,

Mojtaba

[RadekS]

Hi Mojtaba,

The bootloader and application code must be located at different address areas. Any Flash sector which share bootloader and application code is potential source of issue. Therefore bootloader-application border must be aligned by flash sector size.

So, there should not be also any overlapping in s-recod files.

Every s-record line contains S record type identifier, length, address, data, and CRC. SREC (file format) - Wikipedia 

The S-Rec files are text files. You may simply copy all S1/S2 lines (starting by “S1” or “S2”) from the bootloader s19 file into application s19 file (or opposite).

You may ignore all lines except S1/S2 - like lines starting with S0 (file header) or S9 (at end of file).

Note: The S3  format is not relevant for 16bit MCUs.

If there is overlapping at addresses with reset vector(s) use lines from bootloader code.

Please check AN4258 for more details.