安装过程：下载full system需要的两个包：
首先在安装好gem5-stable之后，再到官网下载full system需要的包：
Full System Files : http://www.m5sim.org/dist/current/m5_system_2.0b3.tar.bz2
linux-dist : http://www.m5sim.org/dist/current/linux-dist.tgz
安装：记我的gem5-stable安装目录为$GEM
a) ~/gem5-stable$ mkdir dist
b) 将包m5_system_2.03.tar.bz2 复制到dist目录下
b)~/gem5-stable$ cd dist/
c)~/gem5-stable/dist$ tar -xvf m5_system_2.03.tar.bz2
d)~/gem5-stable/dist$ cd m5_system_2.0b3/
f) ~/gem5-stable/dist/m5_system_2.0b3$ mv ./binaries/ ../binaries
g)~/gem5-stable/dist/m5_system_2.0b3$ mv ./disks/ ../disks
h)~/gem5-stable/dist$ rm -rfm5_system_2.0b3
i)修改$GEM5/config/common/SysPath.py 文件：
把exceptKeyError:
path = [ '/dist/m5/system', '/n/poolfs/z/dist/m5/system
修改成
except KeyError:
path = [ '/dist/m5/system', ' /home/wyj2/gem5-stable/dist' ]

运行
1、 首先编译gem5.opt
~/gem5-stable $ scons ./build/ALPHA/gem5.opt
可以通过 $GEM5/m5out/system.terminal查看启动linux内核的monitor进程。
2、运行模拟的linux系统
./build/ALPHA/gem5.opt ./configs/example/fs.py
将看到如下界面
gem5 Simulator System. http://gem5.org
gem5 is copyrighted software; use the --copyright option for details.
gem5 compiled Jul 13 2013 15:50:46
gem5 started Jul 13 2013 15:53:18
gem5 executing on jsi-desktop
command line: ./build/ALPHA/gem5.opt ./configs/example/fs.py
Global frequency set at 1000000000000 ticks per second
info: kernel located at: /home/wyj2/gem5-stable/dist/binaries/vmlinux
Listening for system connection on port 3456
0: system.tsunami.io.rtc:Real-time clock set to Thu Jan 100:00:00 2009
warn: CoherentBus system.membus has no snooping ports attached!
0: system.remote_gdb.listener: listening for remote gdb #0 on port 7000
**** REAL SIMULATION ****
info: Entering event queue @ 0. Starting simulation...
warn: Prefetch instructions in Alpha do not do anything
warn: Prefetch instructions in Alpha do not do anything

3、开启另外一个ssh界面，使用M5Term来与simulatedsystem进行交互
~/gem5-stable$cd ./util/term
~/gem5-stable$make
~/gem5-stable$sudo make install
~/gem5-stable$m5term localhost 3456
4、这样就进入了模拟出来的系统：
#ls后就看到如下：
# ls
benchmarks etc linuxrc modules sys var
bin iscsi lost+found proc tmp
dev lib mnt sbin usr
5、在模拟系统中运行一个测试程序试试：
#cd benchmarks
#ls
将看到如下几个测试程序：
aio-bench netperf-bin surge
micros pthread_mutex_test
#./pthread_mutex_test2 2
运行结果如下：
Using 2 threadsfor 2 iters
Counter value is 4
#

如何将程序mount进模拟的系统
现在以将$GEM/tests/test-progs/hello/bin/alpha/linux/hello，mount进模拟的系统为例，讲述如何将编译好的程序mount进被模拟的系统。
1、将hello文件拷贝到当前路径/gem5-stable$ cp./tests/test-progs/hello/bin/alpha/linux/hello ./hello
2、~/gem5-stable$ sudo mount -o,loop,offset=32256 ./dist/disks/linux-latest.img /mnt
关于偏移量32256请参考链接：http://my.oschina.net/toyandong/blog/65002
3、显示一下/mnt，可以看到挂载好的操作系统
~/gem5-stable$ ls/mnt
benchmarks dev iscsi linuxrc mnt proc sys usr
bin etc lib lost+found modules sbin tmp var
4、 在使用linux的image文件之前，应该执行umount操作。
~/gem5-stable$ sudo umount /mnt
5、 重新开启模拟的linux，进入模拟的linux (参考本文 “运行” 中的2和3)
#ls
可以看到我们添加的testGem5目录
benchmarks etc linuxrc modules sys usr
bin iscsi lost+found proc testGem5 var
dev lib mnt sbin tmp
6、#cd testGem5
#./hello
执行结果：
Hello world!
#

mark以后备用。