Re: [edk2-devel] [PATCH v3 04/13] ArmPkg: Introduce support for PcdFfaEnable

["Ard Biesheuvel" <ardb@kernel.org>]

On Fri, 15 Jan 2021 at 07:14, Sughosh Ganu <sughosh.ganu@linaro.org> wrote:
>
> The Secure Partition(SP) can request services from the Secure
> Partition Manager Core(SPMC) either through FF-A calls or through the
> existing SVC calls. Add a feature flag Pcd for enabling the FF-A
> method -- when this is set to FALSE, the SP uses the existing SVC
> calls for making the requests.
>
> Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
> Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>

> ---
>
> Changes since V2: None
>
>  ArmPkg/ArmPkg.dec | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/ArmPkg/ArmPkg.dec b/ArmPkg/ArmPkg.dec
> index eaf1072d9e..507e16844c 100644
> --- a/ArmPkg/ArmPkg.dec
> +++ b/ArmPkg/ArmPkg.dec
> @@ -78,6 +78,12 @@
>    # Define if the GICv3 controller should use the GICv2 legacy
>    gArmTokenSpaceGuid.PcdArmGicV3WithV2Legacy|FALSE|BOOLEAN|0x00000042
>
> +  ## Used to select method for requesting services from S-EL1.<BR><BR
> +  #   TRUE  - Selects FF-A calls for communication between S-EL0 and SPMC.<BR>
> +  #   FALSE - Selects SVC calls for communication between S-EL0 and SPMC.<BR>
> +  # @Prompt Enable FF-A support.
> +  gArmTokenSpaceGuid.PcdFfaEnable|FALSE|BOOLEAN|0x0000005B
> +
>  [PcdsFeatureFlag.ARM]
>    # Whether to map normal memory as non-shareable. FALSE is the safe choice, but
>    # TRUE may be appropriate to fix performance problems if you don't care about
> --
> 2.17.1
>
>
>
> 
>
>