Re: Arm Cortex M4 floating point

[Mircea Cociuba]

Hello, the netduinoplus2 is not part of the machine list in qemu "QEMU emulator version 4.2.0"

in which one is it?

in the 4.1.0 version release notes it says "ARM: FPU emulation support for Cortex-M CPUs, FPU fixes for Cortex-R5F"

Now, is there an option to be passed to qemu to get the FPU working?

Mircea Cociuba

"To be or not to be, that is not a question, it's FF".

On Tuesday, August 18, 2020, 03:56:31 PM GMT+3, Peter Maydell <peter.maydell@linaro.org> wrote:

On Mon, 17 Aug 2020 at 14:22, Mircea Cociuba <cociuba_mircea@yahoo.com> wrote:
>
> Hello Guys,
>
> Currently trying to run some code that uses FPU instructions.
> Arm-CortexM4F core.
>
> Using the stelaris board with M3 core, but param M4.
>
> qemu-system-arm -M lm3s811evb -cpu cortex-m4 -m 8K -nographic -kernel notmain.bin
>
> How can I use the FPU in QEMU?

Try using a machine type that uses the Cortex-M4, like
the netduinoplus2. Usually it's a bad idea for arm boards
to try to specify a different CPU than the one they default

to.

thanks
-- PMM