why have two files

satrs-example-stm32f3-disco/.cargo/def_config

@@ -1,28 +0,0 @@
-[target.'cfg(all(target_arch = "arm", target_os = "none"))']
-# uncomment ONE of these three option to make `cargo run` start a GDB session
-# which option to pick depends on your system
-# You can also replace openocd.gdb by jlink.gdb when using a J-Link.
-# runner = "arm-none-eabi-gdb -q -x openocd.gdb"
-# runner = "gdb-multiarch -q -x openocd.gdb"
-# runner = "gdb -q -x openocd.gdb"
-# runner = "probe-run --chip STM32F303VCTx --connect-under-reset"
-
-rustflags = [
-  # LLD (shipped with the Rust toolchain) is used as the default linker
-  "-C", "link-arg=-Tlink.x",
-
-  # if you run into problems with LLD switch to the GNU linker by commenting out
-  # this line
-  # "-C", "linker=arm-none-eabi-ld",
-
-  # if you need to link to pre-compiled C libraries provided by a C toolchain
-  # use GCC as the linker by commenting out both lines above and then
-  # uncommenting the three lines below
-  # "-C", "linker=arm-none-eabi-gcc",
-  # "-C", "link-arg=-Wl,-Tlink.x",
-  # "-C", "link-arg=-nostartfiles",
-]
-
-[build]
-# comment out the following line if you intend to run unit tests on host machine
-target = "thumbv7em-none-eabihf" # Cortex-M4F and Cortex-M7F (with FPU)