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SCons $SOURCE with .elf extension

if I build my mbed project for arm, I do get my .elf, .bin and .hex file.
If I want to point openocd to firmware binary, ‘$SOURCE’ evaluates to firmware.bin
In my I have set PROGSUFFIX to .elf

=> How can I make $SOURCE point to firmware.elf ?

The platform’s builder/ code decides that.

For the STM32 platform, since upload_source = target_firm and target_firm = env.ElfToBin(..), the converted bin file is uploaded. Otherwise one would have to say upload_source = target_elf.

For uploading, if the conversion was correct, using the .bin or .elf files are equivalent, no problems should arise from that.