[U-Boot] [linux-sunxi] [RFC PATCH 8/8] sunxi: enable PSCI for A83T SoC

[Icenowy Zheng]

于 2017年6月7日 GMT+08:00 下午2:50:36, Maxime Ripard <maxime.ripard at free-electrons.com> 写到:
>On Wed, Jun 07, 2017 at 11:47:24AM +0800, Chen-Yu Tsai wrote:
>> On Wed, Jun 7, 2017 at 11:40 AM, Icenowy Zheng <icenowy at aosc.io>
>wrote:
>> >
>> >
>> > 于 2017年6月7日 GMT+08:00 上午11:36:27, Chen-Yu Tsai <wens at csie.org> 写到:
>> >>On Wed, Jun 7, 2017 at 8:47 AM, Icenowy Zheng <icenowy at aosc.io>
>wrote:
>> >>> As we have now a basical implementation of PSCI for A83T, enable
>> >>> non-secure boot support and PSCI on A83T now.
>> >>>
>> >>> Signed-off-by: Icenowy Zheng <icenowy at aosc.io>
>> >>> ---
>> >>>  arch/arm/mach-sunxi/Kconfig | 4 ++++
>> >>>  1 file changed, 4 insertions(+)
>> >>>
>> >>> diff --git a/arch/arm/mach-sunxi/Kconfig
>> >>b/arch/arm/mach-sunxi/Kconfig
>> >>> index 7ced838d6a..31d29de428 100644
>> >>> --- a/arch/arm/mach-sunxi/Kconfig
>> >>> +++ b/arch/arm/mach-sunxi/Kconfig
>> >>> @@ -98,8 +98,12 @@ config MACH_SUN8I_A33
>> >>>  config MACH_SUN8I_A83T
>> >>>         bool "sun8i (Allwinner A83T)"
>> >>>         select CPU_V7
>> >>> +       select CPU_V7_HAS_NONSEC
>> >>> +       select CPU_V7_HAS_VIRT
>> >>> +       select ARCH_SUPPORT_PSCI
>> >>>         select SUNXI_GEN_SUN6I
>> >>>         select SUPPORT_SPL
>> >>> +       select ARMV7_BOOT_SEC_DEFAULT if OLD_SUNXI_KERNEL_COMPAT
>> >>
>> >>The kernel does not work yet. Please have it boot to secure by
>default
>> >>regardless of the kernel. We can have it boot non-secure once the
>> >>kernel
>> >>has been working for a reasonable amount of time.
>> >>
>> >>I don't want clueless users coming and asking why it suddenly
>stopped
>> >>working. This should be an experimental feature.
>> >
>> > Maybe you should send out the fix, and tag them to also apply to
>> > stable tree.
>> >
>> > GIC is really broken, UP systems only work by chance. We
>> > shouldn't depend on this behavior.
>> 
>> As I previously explained, it is not the GIC that is broken. I
>believe
>> the GIC is working exactly as it is supposed to with regards to its
>> input signals.
>> 
>> Allwinner's security extensions implementation simply does not
>properly
>> forward the AXI secure bit when the e-fuse's secure bit isn't burned.
>
>Is that on all revisions, or just the revB ?

All revisions, and even all SoCs after sun8iw6 that we
know, although the GIC issue seems to only show on
multi-cluster SoCs.

The A83T RevA/RevB difference is about CPU0/CPU4 (the first
CPUs in both clusters) bring up.

>
>Maxime