On 27 August 2012 21:37, Meador Inge <mead...@codesourcery.com> wrote: > This changes the driver behavior to choose the default machine > model based on the CPU being used. Defaulting the machine this > way makes it easier to use QEMU as an ISS by just specifying > the -cpu option since a default machine that is suitable for > emulating the full ISA can be chosen. > > For example, currently on ARM the ARM Integrator/CP board is > chosen as the default machine when specifying just a CPU. > However, this doesn't work well when passing -cpu cortex-m3 > since on ARMv7-M processors the NVIC is a part of the architecture > and is needed to support instructions like SVC.
Personally I'd rather we didn't support a "default machine" at all, at least for ARM. It does matter what board you run on, so you need to specify. Just to pick an obvious example, you can't stick a core which supports VFPv4 (the A15 is the only one we have) into the integratorcp, so you would still have to specify both a CPU and a machine name there. We could reasonably add patches which made boards error out if you tried to use them with unsupported CPUs, I guess. -- PMM
