On Tue, Sep 2, 2014 at 2:39 AM, Peter Maydell <peter.mayd...@linaro.org> wrote: > On 24 August 2014 01:13, Alistair Francis <alistai...@gmail.com> wrote: >> The Netduino Plus 2 has a Cortex-M4 in it, while this model uses >> a Cortex-M3 as that is supported by QEMU. This means that the code >> that runs on the Netduino Plus 2 is recompiled for a Cortex-M3 with >> out Floating Point or DSP optimisations. >> >> For my use of this it doesn't matter if the code has to be recompiled, >> so I have no desire to add support for the Cortex-M4. > > That does make things a bit awkward. I don't really want to > add something that claims to be a model of board X if in > fact it won't run anything that isn't specifically built for > "QEMU's deficient model of board X". It seems to me that > would just be a recipe for lots of user complaints...
So the only way you would take this machine is with Cortex-M4 support? I agree it is a bit awkward, but at the moment it is the best I have. I am going to look into the Netduino 2 as well, as that uses a Cortex-M3, but I'm not sure how similar everything else is. It's my understanding that the FPU in the Cortex-M4 is optional (as in not every M4 has it). Does this mean that the only differences between a M3 and M4 in QEMU would be registers and instructions for DSP? Thanks, Alistair > > thanks > -- PMM
