Porting UEFI to a ARM platform
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1. Create the new platform directory under ArmPlatformPkg

2. Create its DSC and FDF files into this new directory. These files can be copied from ArmVExpress-CTA9x4.dsc and ArmVExpress-CTA9x4.fdf; and adapted following the requirement of your platform. 

3. Set up the PCDs required by ArmPlatformPkg in your FDF or DSC files 

PCD	Description
gArmTokenSpaceGuid.PcdSecureFdBaseAddress : Base address of your Secure Firmware 
gArmTokenSpaceGuid.PcdSecureFdSize        : Size in byte of your Secure Firmware gEmbeddedTokenSpaceGuid.
gArmTokenSpaceGuid.PcdNormalFdBaseAddress : Base Address of your Non-Secure Firmware gEmbeddedTokenSpaceGuid.
gArmTokenSpaceGuid.PcdNormalFdSize        : Size in bytes of your Non-Secure Firmware 
gArmTokenSpaceGuid.PcdL2x0ControllerBase  : Base Address of your L2x0 controller 
gArmTokenSpaceGuid.PcdGicDistributorBase  : Base address of the Distributor of your General Interrupt Controller gArmTokenSpaceGuid.
PcdGicInterruptInterfaceBase              : Base address of the Interface of your General Interrupt Controller gArmVExpressTokenSpaceGuid.
PcdCPUCoresSecStackBase                   : Top of Secure Stack for Secure World gArmVExpressTokenSpaceGuid.
PcdCPUCoreSecStackSize                    : Size of the stack for each of the 4 CPU cores gArmVExpressTokenSpaceGuid.
PcdCPUCoresSecMonStackBase                : Top of Stack for Monitor World gArmVExpressTokenSpaceGuid.
PcdCPUCoreSecMonStackSize                 : Size of the stack for each of the 4 CPU cores gArmVExpressTokenSpaceGuid.
PcdCPUCoresNonSecStackBase                : Top of SEC Stack for Normal World gArmVExpressTokenSpaceGuid.
PcdCPUCoresNonSecStackSize                : Size of the stack for each of the 4 CPU Cores gArmVExpressTokenSpaceGuid.
PcdPeiServicePtrAddr                      : Cached value of PeiServicesTable 

4. Implement 'ArmPlatformLib' for your platform following the interface defined by ArmPlatformPkg\Include\Library\ArmPlatformLib.h.

Functions to implement:

VOID ArmPlatformIsMemoryInitialized(VOID);
VOID ArmPlatformInitializeBootMemory(VOID);
VOID ArmPlatformInitializeSystemMemory(VOID);
VOID ArmPlatformBootRemapping(VOID);
UINTN ArmPlatformTrustzoneSupported(VOID);
VOID ArmPlatformTrustzoneInit(VOID);
VOID ArmPlatformGetPeiMemory (
    OUT UINTN*                                   PeiMemoryBase,
    OUT UINTN*                                   PeiMemorySize);
VOID ArmPlatformGetVirtualMemoryMap (
    OUT ARM_MEMORY_REGION_DESCRIPTOR** VirtualMemoryMap);
VOID ArmPlatformGetEfiMemoryMap (
    OUT ARM_SYSTEM_MEMORY_REGION_DESCRIPTOR** EfiMemoryMap)