Added packages contents and prerequisites sections

README.md

@@ -5,12 +5,80 @@ At SiFive we've been distributing binary release packages of the embedded develo
 tools that target our Freedom RISC-V platforms.  This repository contains the scripts
 we use to build these tools.
 
-To build the tools:
-```
-  % git clone [email protected]:sifive/freedom-tools.git
-  % cd freedom-tools
-  % git submodule update --init --recursive
-  % make
-```
+### Packages and their contents
+
+* RISC-V GNU Newlib Toolchain (`riscv64-unknown-elf-*`)
+    * Binutils
+    * GCC
+    * GDB
+    * Newlib (and nano)
+    * LibExpat
+* RISC-V OpenOCD (`riscv-openocd-*`)
+    * OpenOCD
+    * LibFTDI
+    * LibUSB
+
+All the packages has a uniquely named root folder, making it easy to untar/unzip'ing
+multiple versions next to each other.
+
+### To build the tools:
+
+    $ git clone [email protected]:sifive/freedom-tools.git
+    $ cd freedom-tools
+    $ git submodule update --init --recursive
+    $ make
 
 The final output is a set of tarballs in the "bin" folder that should be ready to use.
+The output of a Ubuntu build includes a set of tarballs and zip files for Windows
+which is build using the MinGW toolchain.
+
+### Prerequisites
+
+Several standard packages are needed to build the tools on the different supported platforms.  
+
+
+On Ubuntu, executing the following command should suffice:
+
+    $ sudo apt-get install cmake autoconf automake autotools-dev curl libmpc-dev libmpfr-dev libgmp-dev gawk build-essential bison flex texinfo gperf patchutils bc zlib1g-dev libexpat-dev libtool pkg-config mingw-w64
+
+On OS X, you can use [Homebrew](http://brew.sh) to install the dependencies:
+
+    $ brew install cmake gawk gnu-sed gnu-tar gmp mpfr libmpc isl zlib expat texinfo libtool pkg-config
+
+On Fedora/CentOS/RHEL OS, executing the following command should suffice - plus see below:
+
+    $ sudo yum install cmake libmpc-devel mpfr-devel gmp-devel gawk bison flex texinfo patchutils gcc gcc-c++ zlib-devel expat-devel
+
+On CentOS/RHEL 7 and Fedora you can use yum install for the rest:
+
+    $ sudo yum install autoconf automake libtool pkg-config
+
+On CentOS/RHEL 6 you need to download a compile some tools manually to get the correct versions:
+
+    $ wget http://ftp.gnu.org/gnu/autoconf/autoconf-2.69.tar.gz
+    $ gunzip autoconf-2.69.tar.gz
+    $ tar xvf autoconf-2.69.tar
+    $ cd autoconf-2.69
+    $ ./configure
+    $ make
+    $ make install
+
+    $ wget http://ftp.gnu.org/gnu/automake/automake-1.15.tar.gz
+    $ tar xvzf automake-1.15.tar.gz
+    $ cd automake-1.15
+    $ ./configure
+    $ make
+    $ make install
+
+    $ wget http://ftp.gnu.org/gnu/libtool/libtool-2.4.6.tar.gz
+    $ tar -xzvf libtool-2.4.6.tar.gz 
+    $ cd libtool-2.4.6
+    $ ./configure && make
+    $ make install
+
+    $ wget https://pkgconfig.freedesktop.org/releases/pkg-config-0.29.2.tar.gz
+    $ tar -xzvf pkg-config-0.29.2.tar.gz 
+    $ cd pkg-config-0.29.2
+    $ ./configure --with-internal-glib
+    $ make
+    $ make install