Merge pull request #485 from jcastillo-arm/jc/max_mmap_reg
Add 'MAX_MMAP_REGIONS' and 'ADDR_SPACE_SIZE' to the Porting Guide
diff --git a/docs/porting-guide.md b/docs/porting-guide.md
index 4047d62..cdb722a 100644
--- a/docs/porting-guide.md
+++ b/docs/porting-guide.md
@@ -413,6 +413,22 @@
used, choose the smallest value needed to map the required virtual addresses
for each BL stage.
+* **#define : MAX_MMAP_REGIONS**
+
+ Defines the maximum number of regions that are allocated by the translation
+ table library code. A region consists of physical base address, virtual base
+ address, size and attributes (Device/Memory, RO/RW, Secure/Non-Secure), as
+ defined in the `mmap_region_t` structure. The platform defines the regions
+ that should be mapped. Then, the translation table library will create the
+ corresponding tables and descriptors at runtime. To minimize the amount of
+ runtime memory used, choose the smallest value needed to register the
+ required regions for each BL stage.
+
+* **#define : ADDR_SPACE_SIZE**
+
+ Defines the total size of the address space in bytes. For example, for a 32
+ bit address space, this value should be `(1ull << 32)`.
+
If the platform port uses the IO storage framework, the following constants
must also be defined: