Re: [Qemu-devel] QEMU+Linux ARMv7A current state

[Guenter Roeck]

On 10/04/2015 12:56 PM, Beniamino Galvani wrote:
> On Sat, Oct 03, 2015 at 02:31:08PM -0700, Peter Crosthwaite wrote:
> > QEMU cubieboard has no usable storage media, but the real hardware
> > does have AHCI sata. I added sysbus-ahci at the right place but turns
> > out the SATA controller has some custom power/clock (not really
> > sure??) registers specific to this SoC. It sets/clears bits then polls
> > them back expecting them to change to the other value asynchronously.
> > The kernel device probe then times-out. So I subclassed sysbus-ahci
> > and added the missing registers and forced the polled registers to the
> > "I'm done" state. It works.
>
> Cool, are you going to submit patches for this?
>
> > I am using meta-sunxi Yocto-layer to build out the allwinner custom
> > kernel/rootfs etc, and with the clock and Sata changes I get a boot.
> > But when I change to the unedited kernel+dtb+rootfs I get stuck. RTC
> > messages are around the point of failure which is not modelled in
> > QEMU, so that is suspect.
>
> I don't know, this needs some investigation; on my side a recent
> multi_v7_defconfig kernel, unmodified sun4i-a10-cubieboard.dtb and a
> rootfs built with buildroot mounted through NFS work just fine, with
> the mentioned warnings regarding clk registers and also these:
What is your qemu command line ?

Thanks,
Guenter

> Ignoring attempt to switch CPSR_A flag from non-secure world with SCR.AW bit 
> clear
> Ignoring attempt to switch CPSR_F flag from non-secure world with SCR.FW bit 
> clear
>
> which probably would be solved by setting the property 'has_el3' of
> the CPU to false before realization.
>
> Beniamino