Directory Structure :
---------------------
1. l2/build/ : contains files required to compile the code
   a. common : contains individual module's makefile
   b. config : contains SSI memory configuration
   c. odu    : contains main makefile to generate an executable binary

2. l2/docs/  : contains README and other configuration files for building docs
	
2. l2/src/ : contains layer specific source code
   a. 5gnrmac  : MAC source code
   b.	5gnrrlc  : RLC source code
   c. cm       : common, environment and interface files
   d. cu_stub  : Stub code for CU
   e. du_app   : DU application and F1 code 
   f. mt       : wrapper functions over OS
   g. phy_stub : Stub code for Physical layer
   h. rlog     : logging module


Pre-requisite for Compilation :
-------------------------------
1. Linux 32-bit/64-bit machine
2. GCC version 4.6.3 and above


How to Clean and Build:
-----------------------
1. Building ODU binary:
   a. Build folder
         cd l2/build/odu
   b. Building ODU binary
         make odu MACHINE=BIT64 MODE=FDD
   c. Cleaning ODU binary
         make clean_odu MACHINE=BIT64 MODE=FDD

2. Building CU Stub binary:
   a. Build folder
         cd l2/build/odu
   b. Building CU Stub binary
         make cu_stub NODE=CU_STUB MACHINE=BIT64 MODE=FDD
   c. Cleaning CU Stub binary
         make clean_cu NODE=CU_STUB MACHINE=BIT64 MODE=FDD

3. Cleaning ODU and CU Stub
      make clean_all MACHINE=BIT64 MODE=FDD

How to execute:
---------------
1. Assign virtual IP addresses as follows:
      ifconfig <interface name>:ODU "10.0.2.20"
      ifconfig <interface name>:CU_STUB "10.0.2.25"

2. CU execution folder:
      cd l2/bin/cu_stub
     
3. Run CU Stub binary:
      ./cu_stub

4. DU execution folder:
      cd l2/bin/odu
     
5. Run ODU binary:
      ./odu

PS: CU stub must be run first