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i have 1 more query related to GIC. in Cortex-A53 it is mentioned that it is using GIC 400 and GIC architecture Version 4, but in ARM site i am not seeing any GIC V4 Doc, there is only GIc v2
Hello anoopstm
The GIC-500 (based on the GICv3 Architecture Specifications - disclosed only to contracted costumers, as mentioned by yasuhikokoumoto ) is designed to work directly with the Cortex-A53.
The GIC-400 (based on the GICv2 Architecture Specifications) could be also used with the Cortex-A53 in some configurations.
If you need any further information on the different ARM GIC IPs you could consult this page on the ARM web corporate web site CoreLink Interrupt Controllers - ARM.
Moreover, as Alban Rampon mentioned, if you are a ARM customer or partner do not hesitate to create a support case to receive further detail and clarifications.
HTH,
Carmelo