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-rw-r--r--docs/system/arm/sbsa.rst14
1 files changed, 14 insertions, 0 deletions
diff --git a/docs/system/arm/sbsa.rst b/docs/system/arm/sbsa.rst
index f571fe6..a8e0b53 100644
--- a/docs/system/arm/sbsa.rst
+++ b/docs/system/arm/sbsa.rst
@@ -46,6 +46,9 @@ to be a complete compliant DT. It currently reports:
- platform version
- GIC addresses
+Platform version
+''''''''''''''''
+
The platform version is only for informing platform firmware about
what kind of ``sbsa-ref`` board it is running on. It is neither
a QEMU versioned machine type nor a reflection of the level of the
@@ -54,3 +57,14 @@ SBSA/SystemReady SR support provided.
The ``machine-version-major`` value is updated when changes breaking
fw compatibility are introduced. The ``machine-version-minor`` value
is updated when features are added that don't break fw compatibility.
+
+Platform version changes:
+
+0.0
+ Devicetree holds information about CPUs, memory and platform version.
+
+0.1
+ GIC information is present in devicetree.
+
+0.2
+ GIC ITS information is present in devicetree.