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RTOS/PROCESSOR-SDK-AM335X: SDK questions

Part Number: PROCESSOR-SDK-AM335X

Tool/software: TI-RTOS

Hello

Im trying to understand build philosophy of PDK. I have a lot of questions.

Let's start from easy one.

goral@goraldeb:/home/rnd_share/ti/PDK_RTOS_04.01.00.06/pdk_am335x_1_0_8/packages$ cat pdksetupenv.sh
#!/bin/bash
# ******************************************************************************
# * FILE PURPOSE: Environment Setup for building PDK
# ******************************************************************************
# * FILE NAME: pdksetupenv.sh
# *
# * DESCRIPTION:
# *  Configures and sets up the Build Environment for PDK.
# *
# *  The batch file expects an optional argument:PDK_INSTALL_PATH: Location
# *  of the PDK package.  If the argument is not specified the batch file
# *  assumes that the PDK is installed in the same location where the batch
# *  file is located and is being executed.
# *
# * USAGE:
# *  ./pdksetupenv.sh ~/ti/pdk_<device>_<version>/packages
# *     --- OR ---
# *  ./pdksetupenv.sh
# *
# * Copyright (C) 2012-2017, Texas Instruments, Inc.
# *****************************************************************************

ok, now :

goral@goraldeb:/home/rnd_share/ti/PDK_RTOS_04.01.00.06/processor_sdk_rtos_am335x_4_01_00_06$ cat setupenv.sh
#!/bin/bash
# ******************************************************************************
# * FILE PURPOSE: Environment Setup for building Processor SDK components
# ******************************************************************************
# * FILE NAME: setupenv.sh
# *
# * DESCRIPTION:
# *  Configures and sets up the Build Environment for Processor SDK.
# *
# * USAGE:
# *  ./setupenv.sh
# *
# * Copyright (C) 2015 - 2017, Texas Instruments, Inc.
# *
# * Redistribution and use in source and binary forms, with or without
# * modification, are permitted provided that the following conditions
# * are met:

As I believe Processor SDK = PDK, then the question is, what's the responsibility of

/home/rnd_share/ti/PDK_RTOS_04.01.00.06/processor_sdk_rtos_am335x_4_01_00_06/setupenv.sh

and

/home/rnd_share/ti/PDK_RTOS_04.01.00.06/pdk_am335x_1_0_8/packages/pdksetupenv.sh

and what's difference between them ?