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

[Maxime Ripard]

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 ?

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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