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-rw-r--r--docs/porting-guide.md6
1 files changed, 4 insertions, 2 deletions
diff --git a/docs/porting-guide.md b/docs/porting-guide.md
index 8a024d8..e967b0e 100644
--- a/docs/porting-guide.md
+++ b/docs/porting-guide.md
@@ -631,8 +631,10 @@ this function. This information is accessible in the `bl33_meminfo` field in
the `bl31_args` structure pointed to by `bl2_to_bl31_args`.
Platform security components are configured if required. For the Base FVP the
-TZC-400 TrustZone controller is configured to grant secure and non-secure access
-to DRAM.
+TZC-400 TrustZone controller is configured to only grant non-secure access
+to DRAM. This avoids aliasing between secure and non-secure accesses in the
+TLB and cache - secure execution states can use the NS attributes in the
+MMU translation tables to access the DRAM.
This function is also responsible for initializing the storage abstraction layer
which is used to load further bootloader images.