feat(rme): change the default max GPT block size to 512MB

Previously the max GPT block size was set to 2MB as a conservative
default. For workloads making use of SMMU in Normal world, and has
a Stage 2 block mapping of large sizes like 512MB or 1GB, then a
max GPT block size of 2MB may result in performance regression.
Hence this patch changes the default max GPT block size from 2MB to 512MB.

Change-Id: If90f12f494ec0f44d3e5974df8d58fcb528cfd34
Signed-off-by: Soby Mathew <soby.mathew@arm.com>

docs/getting_started/build-options.rst

@@ -848,7 +848,7 @@ Common build options
 -  ``RME_GPT_MAX_BLOCK``: Numeric value in MB to define the maximum size of
    supported contiguous blocks in GPT Library. This parameter can take the
    values 0, 2, 32 and 512. Setting this value to 0 disables use of Contigious
-   descriptors. Default value is 2.
+   descriptors. Default value is 512.
 
 -  ``ROT_KEY``: This option is used when ``GENERATE_COT=1``. It specifies a
    file that contains the ROT private key in PEM format or a PKCS11 URI and

make_helpers/defaults.mk

@@ -146,7 +146,7 @@ GENERATE_COT			:= 0
 RME_GPT_BITLOCK_BLOCK		:= 1
 
 # Default maximum size of GPT contiguous block
-RME_GPT_MAX_BLOCK		:= 2
+RME_GPT_MAX_BLOCK		:= 512
 
 # Hint platform interrupt control layer that Group 0 interrupts are for EL3. By
 # default, they are for Secure EL1.