feat(plat/sgi): introduce platform variant build option
A Neoverse reference design platform can have two or more variants that
differ in core count, cluster count or other peripherals. To allow reuse
of platform code across all the variants of a platform, introduce build
option CSS_SGI_PLATFORM_VARIANT for Arm Neoverse reference design
platforms. The range of allowed values for the build option is platform
specific. The recommended range is an interval of non negative integers.
An example usage of the build option is
make PLAT=rdn2 CSS_SGI_PLATFORM_VARIANT=1
Change-Id: Iaae79c0b4d0dc700521bf6e9b4979339eafe0359
Signed-off-by: Aditya Angadi <aditya.angadi@arm.com>
diff --git a/docs/plat/arm/arm-build-options.rst b/docs/plat/arm/arm-build-options.rst
index 2aa9738..79b40d1 100644
--- a/docs/plat/arm/arm-build-options.rst
+++ b/docs/plat/arm/arm-build-options.rst
@@ -132,6 +132,12 @@
valid value greater than 1, the platform code performs required configuration
to support multi-chip operation.
+- ``CSS_SGI_PLATFORM_VARIANT``: Selects the variant of a SGI/RD platform. A
+ particular SGI/RD platform may have multiple variants which may differ in
+ core count, cluster count or other peripherals. This build option is used
+ to select the appropriate platform variant for the build. The range of
+ valid values is platform specific.
+
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