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N1SDP platform supports RDIMMs with ECC capability. To use the ECC
capability, the entire DDR memory space has to be zeroed out before
enabling the ECC bits in DMC620. Zeroing out several gigabytes of
memory from SCP is quite time consuming so functions are added that
zeros out the DDR memory from application processor which is
much faster compared to SCP. BL33 binary cannot be copied to DDR memory
before enabling ECC so this is also done by TF-A from IOFPGA-DDR3
memory to main DDR4 memory after ECC is enabled.

Original PLAT_PHY_ADDR_SPACE_SIZE was limited to 36-bits with which
the entire DDR space cannot be accessed as DRAM2 starts in base
0x8080000000. So these macros are redefined for all ARM platforms.

Change-Id: If09524fb65b421b7a368b1b9fc52c49f2ddb7846
Signed-off-by: Manoj Kumar <manoj.kumar3@arm.com>

MHU doorbell driver requires arm platform specific
macro "PLAT_CSS_MHU_BASE".
Rename it to "PLAT_MHUV2_BASE", so that platforms other than arm
can use generic MHU doorbell driver.
Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>

Replace all usage of 'sgiclark' with 'rdn1e1edge' and 'sgiclarkh' with
'rde1edge' as per the updated product names.

Change-Id: I14e9b0332851798531de21d70eb54f1e5557a7bd
Signed-off-by: Chandni Cherukuri <chandni.cherukuri@arm.com>