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    • Default FPU Mode

    Posted by bugmenot on 2015-06-04 12:34

    I've created a new project based on custom STM32F407 board with default settings.

    The files are being compiled using these FPU settings: mfloat-abi=hard -mfpu=fpv4-sp-d16

    The startup_stm32.s file contains this code:

    .syntax unified
    .cpu cortex-m4
    .fpu softvfp
    .thumb

    I'm not sure, but isn't there a conflict here (i.e. hard vs soft)? Shouldn't changing the FPU settings in the project change also the .fpu line in the startup file?

    Reads: 14190
    Posted by dautrevaux on 2015-06-04 20:05 France

    In fact the .fpu softvfp line is useless in this file, as there is no floating point operations, but effectively this line should say .fpu hard to be consistent.

    Bernard