__do_global_dtors_aux and frame_dummy

[michaelhuslig]

I am fighting for every byte trying to put a boot loader in 1 Flash sector.  The routines __do_global_dtors_aux and frame_dummy are linked into my plain C program, but are never referenced.  How do I get rid of them?

Also what is _global_impure_ptr and how do I get rid of it?

[michaelhuslig]

I found I can get rid of the routines __do_global_dtors_aux and frame_dummy by commenting out the .init_array and .fini_array sections of the *.ld file.  But I still have the _global_impure_ptr and the unused routines _init and _fini at the end of the created listing.  I used the project wizard to create a minimal sdk2 project for the MK22FX512AVLQ12 with no drivers and no rtos, turned on the create extended listing in toolchains and compiled.

Mike

[michaelhuslig]

MK22FX512AVLQ12

I started out with the SDK2 usb_device_msc_ramdisk project and added code routines from Kinetis_MK60N512VMD100_msd_bootloader.

The bootloader basically works;  I am just trying to get it smaller in size.

Mike

[Carlos_Mendoza]

Hi Michael,

Could you tell us which MCU are you using?

Also, are you running an example project?

Thanks in advance!

Best Regards,

Carlos Mendoza

Technical Support Engineer