In this new hmc configuration we have used the existing components in gem5 mainly [SerialLink] [NoncoherentXbar]& [DRAMCtrl] to define 3 different architecture for HMC.
Highlights
1- It explores 3 different HMC architectures 

2- It creates 4-HMC crossbars and attaches 16 vault controllers with it. This  will connect vaults to serial links 

3- From the previous version, HMCController with round robin funtionality is being removed and all the serial links are being accessible directly from user ports 

4- Latency incorporated by HMCController (in previous version) is being added to SerialLink

Current version only works for traffic generator setup {can be extended for full-system and system-emulation}
How to run it
from you gem5 home directory run the following commands
build/ARM/gem5.opt configs/example/hmctest.py --mem-type=HMC_2500_x32 --mode=RANDOM  --arch=same

build/ARM/gem5.opt configs/example/hmctest.py --mem-type=HMC_2500_x32 --mode=RANDOM  --arch=distributed

build/ARM/gem5.opt configs/example/hmctest.py --mem-type=HMC_2500_x32 --mode=RANDOM  --arch=mixed
Dependency
This patch required another tester patch to be applied before running the test 
http://reviews.gem5.org/r/3374/