Hello Amreen:
This option is kind of hidden. The procedure to get the S19 file is explained by Erich (reply above) in his blog:
S-Record Generation with gcc for ARM/Kinetis | MCU on Eclipse
Please notice that by default it will generate a file with HEX extension, but the format is actually S-Record. For a workaround, refer to the first comment at the end of the mentioned link.
Regards!,
Jorge Gonzalez
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