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Hi, I thought I'd check the memory requirements of a small application: $ arm-elf-size smallapp text data bss dec hex filename 172171 3032 16940 192143 2ee8f Project Ok, bss is 16940 bytes. So who uses them ? $ arm-elf-nm -S -C -r --size-sort smallapp 0004bd8c 00002000 B stack 000387b8 00001010 T vfnprintf 00024138 00000e7c t _vprintf(void (*)(char, void**), void**, ... 0003b658 00000b50 t construct_converter(Cyg_Clock::converter*,... 00041960 0000099c T Cyg_Mempool_dlmalloc_Implementation::resize_alloc(... 00037728 0000090c T Cyg_Condition_Variable::wait_inner(Cyg_Mutex*) 000336dc 000005f0 T Cyg_Mbox::put(void*, unsigned long long) 0003f334 000005d8 T realloc ... This gave me a long list of information, so I wrote a small script (in ruby, you can find it in the attachement) to add all the sizes which go in the .bss section, marked with a "B": $ arm-elf-nm -S -C -r --size-sort Project | ruby add.rb bss size: 10120 Hmm, the sum of all sizes which go to .bss is 6000 bytes less then the size reported by arm-elf-size. Can you enlighten me how to interpret these data ? Bye Alex
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add.rb
Description: add.rb
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