[U-Boot] [linux-sunxi] Re: [PATCH v3 3/3] sunxi: add support for Lichee Pi Zero

[Chen-Yu Tsai]

On Thu, Feb 16, 2017 at 9:32 AM, André Przywara <andre.przywara at arm.com> wrote:
> On 14/02/17 07:36, Maxime Ripard wrote:
>> On Mon, Feb 13, 2017 at 04:12:04PM +0800, Icenowy Zheng wrote:
>>>
>>> 2017年2月13日 15:17于 Maxime Ripard <maxime.ripard at free-electrons.com>写道：
>>>>
>>>> Hi,
>>>>
>>>> On Sat, Feb 11, 2017 at 07:11:02PM +0800, Icenowy Zheng wrote:
>>>>> @@ -0,0 +1,13 @@
>>>>> +CONFIG_ARM=y
>>>>> +CONFIG_ARCH_SUNXI=y
>>>>> +# CONFIG_ARMV7_NONSEC is not set
>>>>
>>>> Why? It doesn't have Trustzone?
>>>
>>> The CPU has Secure mode, but no TrustZone Peripheral Controller,
>>> neither SMP.
>>
>> Still, booting in HYP and having PSCI sounds like a good idea.
>
> Yes, so without this option Linux will run in secure state, if I am not
> mistaken, which is discouraged. Instead we should enter Linux in
> (non-secure) HYP mode [1], which will allow KVM, for instance. So I'd
> recommend to remove this last line.
> Whether we need PSCI on an UP system is a separate question, I don't
> know from the top of my head if ARM(32) uses it for suspend/resume. But
> anyway this is not implemented in U-Boot's PSCI implementation, IIRC.
> So for just disabling PSCI we could use:
>
> +# CONFIG_ARMV7_PSCI is not set

We'll need to add some more code (or disable some) though. If PSCI isn't
enabled, U-boot will try to bring up the cores (by calling some non-existent-
in-sunxi function) and put them in a holding pen.

I guess Icenowy can figure that bit out.

ChenYu

>
> Cheers,
> Andre.
>
> [1] http://lxr.free-electrons.com/source/Documentation/arm/Booting#L188
>
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