Messages in this thread | | | Date | Fri, 9 Dec 2022 18:45:34 +0000 | From | "Russell King (Oracle)" <> | Subject | Re: [RFC 1/1] ARM: Drop !ARCH_MULTIPLATFORM dependency from Cortex A8/9 erratas |
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On Fri, Dec 09, 2022 at 07:20:00PM +0100, Sebastian Reichel wrote: > All the erratas for more recent CPUs (Cortex A15/A12/A17) do not > require !ARCH_MULTIPLATFORM, since there is runtime detection of > effected CPUs in arch/arm/mm/proc-v7.S. > > Errata config options for the older Cortex A8/A9 CPUs have the > !ARCH_MULTIPLATFORM dependency, but the CPUs are also runtime > detected. Since there is runtime detection, it should be fine > to enable the erratas for a multi platform kernel. > > Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com> > --- > For me the most likely explanation that this has not yet happened is > me missing an important detail, so I sent it as RFC. If you point it > out I will try to document the reason.
IIRC, the reason these are marked with !ARCH_MULTIPLATFORM is for when the kernel is running in the non-secure world - the accessed registers may prevent platforms booting. However, it was a long time ago and I don't remember clearly now.
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