Re: [Qemu-devel] [PATCH for-2.5 v1 3/4] arm: highbank: Implement PSCI and dummy monitor

[Rob Herring]

On Tue, Oct 27, 2015 at 4:30 PM, Peter Crosthwaite
<address@hidden> wrote:
>
>
> On Tue, Oct 27, 2015 at 1:29 PM, Rob Herring <address@hidden> wrote:
>>
>> On Sun, Oct 25, 2015 at 6:13 PM, Peter Crosthwaite
>> <address@hidden> wrote:
>> > Firstly, enable monitor mode and PSCI, both are which are features of
>> > this board.
>> >
>> > In addition to PSCI, this board also uses SMC for cache maintainence
>> > ops. This means we need a secure monitor to catch these and nop them.
>> > Use the ARM boot board-setup feature to implement this.
>> >
>> > Signed-off-by: Peter Crosthwaite <address@hidden>
>>
>> Thanks for doing this. I'm not a big fan of how the machine code for
>> boot code is embedded into C in qemu, but that's a separate issue.
>>
>> Acked-by: Rob Herring <address@hidden>
>>
>
> Thanks,
>
> One question while you are here if you have the answer off-hand. Does the
> highbank firmware switch out of secure mode before booting the kernel or
> stay in secure mode? I know of platforms that regularly boot Linux into
> secure mode, so if it is one of those we might as well get it right
> per-board when doing Peters proposed idea.

The firmware switches out of secure mode. The kernel doesn't allow
switching, so it is true of all platforms that run non-secure
(although some do it in u-boot).

Rob