On Sun, Mar 18, 2018 at 08:07:15PM +0100, Mylène Josserand wrote: > Hello Mark, > > Please, excuse me for this late answer and thank you for the review! > > On Wed, 7 Mar 2018 12:18:33 +0000 > Marc Zyngier <marc.zyngier@xxxxxxx> wrote: > > > On 23/02/18 13:37, Mylène Josserand wrote: > > > On Cortex-A7, the CNTVOFF register from arch timer is uninitialized. > > > > Only on A7? Is that specific to your platform? > > I do not really know other Allwinner's platforms about this subject. At > least, the sun9i-a80 which is a Cortex-a15/a7 does not need that but it > is necessary for sun8i-a83t which is a cortex-a7. Maybe, Chen-Yu or > Maxime could help us on it. This is not related to the CPU. On all the other SoCs but the A80 and the A83t, U-Boot will boot the system in HYP, and while switching to non-secure will setup CNTVOFF on the boot CPU. On the A80 and A83t, U-Boot will execute the kernel in secure, it will not switch to non-secure, and CNTVOFF will not be set on the boot CPU. Maxime -- Maxime Ripard, Bootlin (formerly Free Electrons) Embedded Linux and Kernel engineering https://bootlin.com -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
