Clarify that transition to Bare from mode other than Off is unspecified

riscv-non-isa · Apr 17, 2024 · 7e9175d · 7e9175d
1 parent e4a05d5
commit 7e9175d
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/iommu_registers.adoc b/iommu_registers.adoc
@@ -407,7 +407,8 @@ RISC-V harts, devices, and IOMMUs in the platform.
 The IOMMU behavior of writing `iommu_mode` to `1LVL`, `2LVL`, or `3LVL`, when
 the previous value of the `iommu_mode` is not `Off` or `Bare` is `UNSPECIFIED`.
 To change DDT levels, the IOMMU must first be transitioned to `Bare` or `Off`
-state.
+state. The behavior resulting from changing the `iommu_mode` to `Bare` when the
+previous value of the `iommu_mode` was not `Off` is `UNSPECIFIED`.
 
 When an IOMMU is transitioned to `Bare` or `Off` state, the IOMMU may retain
 information cached from in-memory data structures such as page tables, DDT,