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This patch adds support for the N1SDP (NeoVerse N1 System Development
Platform). It is an initial port and additional features are expected
to be added later.

The port includes only BL31 support as the System Control Processor
(SCP) is expected to take the role of primary boatloader

Change-Id: Ife17d8215a7bfcc1420204a72205e7ef920d0c10
Signed-off-by: Deepak Pandey <Deepak.Pandey@arm.com>

On SGI platforms, the interconnect is setup by the SCP and so the
existing unused interconnect setup in sgi575 platform code can be
removed. As a result of this, sgi_plat_config.c and sgi_bl1_setup.c
files can be removed as these files are now empty or can be
substainated by the existing weak functions.

Change-Id: I3c883e4d1959d890bf2213a9be01f02551ea3a45
Signed-off-by: Chandni Cherukuri <chandni.cherukuri@arm.com>

Mark the initialization functions found in the BL31 boot sequence
as __init so they can be reclaimed when no longer needed.

Change-Id: I687a89346419c7710ef5097feaa325d83c527697
Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>

Add support for System Guidance for Infrastructure platform SGI575.

Change-Id: I0125c2ed4469fbc8367dafcc8adce770b6b3147d
Signed-off-by: Nariman Poushin <nariman.poushin@linaro.org>