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-rw-r--r--README8
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diff --git a/README b/README
index 4fee7066d5..6ea1af2678 100644
--- a/README
+++ b/README
@@ -3869,6 +3869,14 @@ Configuration Settings:
Scratch address used by the alternate memory test
You only need to set this if address zero isn't writeable
+- CONFIG_SYS_MEM_RESERVE_SECURE
+ If defined, the size of CONFIG_SYS_MEM_RESERVE_SECURE memory
+ is substracted from total RAM and won't be reported to OS.
+ This memory can be used as secure memory. A variable
+ gd->secure_ram is used to track the location. In systems
+ the RAM base is not zero, or RAM is divided into banks,
+ this variable needs to be recalcuated to get the address.
+
- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
this specified memory area will get subtracted from the top
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