在Niosii上跑NiosIILinux！

*************************************************************************************************************
**  Project          :   Linux BSP for Embedded System Development Kit Cyclone III (3C120)
**  File Name      :   Linux_3c120_README.txt
**  Last Updated  :  4th August 2009
**  Author           :  System Level Solutions
*************************************************************************************************************
Quick Start Guide
--------------------------

We assume that you are acquainted with Linux enviornment.
1.  Install the following development packages at host side by giving following command.

    #apt-get install git-all git-gui tcsh make gcc ncurses-develbison byacc flex gawk gettext ccache zlib-devel gtk2-devel lzo-devel pax-utils

2.  Download the Linux BSP source (Nios2Linux-20090804-0.0.0.0.tar.bz2) and quick reference
    ( Quick_ref-20090805-0.0.0.0.tar.bz2) from http://www.slscorp.com/pages/bsp3c120.php

    Size      :        508.44 MB
     Source   :        Nios2Linux-20090804-0.0.0.0.tar.bz2
    MD5SUM :        4c54f86ef036591a53d18ac8bf6c7bf9

    Size      :        3.67 MB
     Source   :        Quick_ref-20090805-0.0.0.0.tar.bz2
    MD5SUM :        adee59e8100e3d113e40ed5fed529f4b

3.  Copy the BSP source 'Nios2Linux-20090804-0.0.0.0.tar.bz2' at the development folder on your
    linux PC and extract it.

     Ex:
         #cd /home/sls/
         #tar -jxvf Nios2Linux-20090804-0.0.0.0.tar.bz2

      The 'Nios2-Linux' folder will be created. It contains following three folders.
    BuildTools      :  Prebuild bin tools gcc 1.1.2 for nios2-linux
    Linux_source  :  Kernel and Application
    System-Board :  System file for specific board. It contains only for 3c120 board files

4.  Set the Bintools path on your terminal.

     Ex:
         #PATH=$PATH:/home/sls/Nios2-Linux/BinTools/toolchain-mmu/x86-linux2/bin

PATH=$PATH:/home/grant/Nios2-Linux/BuildTools/toolchain-mmu/x86-linux2/bin        (每次打开终端都要添加一次）  

查看：echo $PATH         

sudo ln -s /lib/libncurses.so.5 /usr/lib/libtinfo.so.5                   ---只需要这么一句话！原因参考下文转载

注意！：
　　　　　# nios2-wrs-linux-gnu-gcc hello.c -o hello                ---交叉编译
Step 1：
所有要打包成image的檔案，都會放在/home/grant/Nios2-Linux/Linux_source/uClinux-dist/romfs下，也就是說，我們只要將執行檔、函式庫、圖片....放在這個目錄下，將來就會打包成zImage下載到开发板的SDRAM內。

(或者將hello_world_linux放到/uClinux-dist/romfs/usr/bin下
类似[root@localhost src]# cp hello_world_uclinux /usr/local/src/uClinux-dist/romfs/usr/bin )

5.  Build the Linux image.

cd /home/grant/Nios2-Linux/Linux_source/uClinux-dist/

       #make menuconfig
       #make

      After compilation, you will get different images in the image folder located at:
      /home/sls/Nios2-Linux/Linux_source/uClinux-dist/image/

      The linux.initramfs.gz file is an elf image with initramfs, built-in with u-boot images
      (images/vmImage and rootfs.initramfs.gz).

6.  Download the .elf and .sof files and then run the elf file.

       (a)  Download the sof file 'nios2_linux_3c120_125mhz_top.sof' located at
             /home/sls/Nios2-Linux/System-Board/3c120_default/
       (b)  Download elf file 'linux.initramfs.gz' located at
             /home/sls/Nios2-Linux/Linux_source/uClinux-dist/image/
       (c)  You will get Linux booting masseges on the nios2-terminal window.

                #nios2-configure-sof "路径名".sof         eg:#nios2-configure-sof C:/nios2_linux_3c120_125mhz_top.sof
             Ex:
        #nios2-download -g linux.initramfs.gz        eg:nios2-download -g  C:/linux.initramfs.gz 
        #nios2-terminal
验证结果：
            Welcome to      NiosIILinux

       ls
执行：     ./hello


Note: 
    -- Release is tested on fedora 8 only.