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japaric / f3

Board Support Crate for the STM32F3DISCOVERY
Apache License 2.0
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Binary size and flashing with st-flash #87

Closed tekjar closed 6 years ago

tekjar commented 6 years ago

Hi @japaric . The binary size of blinky is around 2.6 mb. Given the flash size is 256K, how is gdb load working? Is there some sort of partial loading?

du -sh blinky
2.6M    blinky

But debug build with st-flash fails while release build works (flashing works, doesn't blink though)

st-flash write blinky  0x08000000
japaric commented 6 years ago

The binary size of blinky is around 2.6 mb.

That's not the size of the actual binary that will get flashed into the microcontroller. Most of that size are debug symbols. You can get the real size by running arm-none-eabi-size on the file.

st-flash

These flashing utilities usually expect a .bin file; not an ELF, which is the artifact that Cargo produces. You can convert the ELF file into a .bin file using arm-none-eabi-objcopy -- I don't recall the exact command off the top of my head though; you'll have to look for it on the internet.

tekjar commented 6 years ago

Ohh ok. Thanks :)

tekjar commented 6 years ago 
arm-none-eabi-objcopy -O binary  roulette roulette.bin
st-flash write roulette.bin 0x08000000

works