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TI RPMsg Char Package
======================

1. Introduction
----------------
This repo contains the source code for a small rpmsg-char utility library
and some basic examples and/or tests exercising the API provided by the
ti_rpmsg_char library. The library is primarily designed to provide Linux
applications an easy means to open and identify rpmsg character devices
created by the Linux kernel rpmsg-char driver using the virtio-rpmsg-bus
transport back-end.

The library currently supports the TI K3 AM65x, J721E and J7200 SoCs, but
can be easily scaled to support other SoCs.


2. Sources
-----------
The repo is maintained as a git tree, and so the sources can simply be
downloaded using git.

  git clone git://git.ti.com/rpmsg/ti-rpmsg-char.git

The following is the directory structure for this package:
 - src      : Library source code and internal header files
 - include  : Public exported headers for applications usage
 - examples : Example source code


3. API
-------
The library provides only 4 basic API. Please see the documentation in
include/ti_rpmsg_char.h for each of the API and function arguments.

 - rpmsg_char_init()
 - rpmsg_char_exit()
 - rpmsg_char_open()
 - rpmsg_char_close()

Applications need only include the ti_rpmsg_char.h. All the remoteproc
ids to be used are defined in rproc_id.h, which is already included in
ti_rpmsg_char.h.


4. Build
---------

4.1 Infrastructure Tools
The package uses the autotools infrastructure for build. The following
versions are used:
    GNU autoconf : 2.69
    GNU automake : 1.15.1
    GNU libtool  : 2.4.6

The following Arm cross-compilers are used to build the library and
examples:
    v8 Compiler  : gcc-arm-9.2-2019.12-x86_64-aarch64-none-linux-gnu
    v7 Compiler  : gcc-arm-9.2-2019.12-x86_64-arm-none-linux-gnueabihf

4.2 Build Steps
 1. Install the necessary autotools and compilers
 2. Add the installed compiler bin path to your PATH variable
      eg: export PATH=<install_path>/gcc-arm-9.2-2019.12-aarch64/bin:$PATH
 3. Configure the autotools with necessary host and optional prefix to be
    used to install the build libraries and executables
      cd <ti-rpmsg-char-dir>
      autoreconf -i
      ./configure --host=aarch64-none-linux-gnu --prefix=<target-dir>
 4. Build and Install Library
      make
      make install
 5. Build Examples, the top-level Makefile builds only the library by
    default
      make -C examples
      make -C examples install
              or
      cd examples
      make
      make install

4.3 Clean Steps
  1. Use the desired generic Makefile targets
       make clean      : Erase the files built by make
       make distclean  : clean + Erase the files created by the configure step
       make uninstall  : Erase the installed libraries and executables
  2. Cleaning up examples specifically needs separate commands. It is all
     similar to the commands in #1, but invoked with -C examples, or invoke
     normally from within the examples folder
       eg: make -C examples uninstall
                     or
           cd examples; make uninstall
  3. Use git clean to get the repo back to a pristine state
       git clean -dfx