Re: [Qemu-devel] [PATCH 5/5] Add Cortex-A15 CPU definition

[Paul Brook]

> >> Add a definition of a Cortex-A15 CPU. Note that for the moment we do
> >> not implement any of:
> >>  * Large Physical Address Extensions (LPAE)
> >>  * Virtualization Extensions
> >>  * Generic Timer
> > 
> > Are there feature bits that the guest can check before blindly using
> > them?  I assume for at least LPAE and the timer there's a way for the OS
> > to test for these features without just poking at them and seing if they
> > explode.
> > 
> > If so it's worth adding coments describing where these diverge from a
> > real A15.
> 
> There are feature bits, yes, but I've followed the general current
> qemu practice of following the feature bits of the real hardware
> rather than clearing feature bits for things we don't support
> (eg for A9 we are currently claiming TrustZone and ThumbEE when
> neither are actually true for QEMU).

These are bugs.

Paul