最近买了两条2G的内存，插上后发现系统每条只认到了1G，我一般很少怀疑别人的人品的，所以想到可能是BIOS版本太低。

在dell的网站上转啊转，在一大堆英文中找到了2650的linux版BIOS升级程序。

wget http://ftp.us.dell.com/bios/PE2650_BIOS_LX_A21.BIN

找台机下载后执行一下

chmod +x PE2650_BIOS_LX_A21.BIN

./PE2650_BIOS_LX_A21.BIN

晕，这个程序用到了rpm等redhat特有的东东，在debian上运行不起来，尝试在debian下安装这些东西，结果失败。

没办法，dell的这个程序只支持redhat和windows，其它版本的操作系统跑不了，我也不想硬来，免得罗嗦。

问人借台机先试一下吧，找了台redhat el5的服务器，运行一下：

./PE2650_BIOS_LX_A21.BIN

等了好一阵子，要有耐心，就会出来一个说明文字，纯英文哦，我看不太懂，先把它拷贝存着，然后按q键跳过说明文字，继续安装：

Error while loading shared libraries: libstdc++.so.5:

cannot open shared object file: No such file or directory.

You must install the Linux compatibility libraries.

To install the compatibility libraries, use the following command:

"rpm -ih compat-libstdc++-33-3.2.3-47.3.i386.rpm"

飘错了，libstdc++没装，在google上搜吧，找到一个：

wget ftp://ftp.pbone.net/mirror/www.startcom.org/AS-4.0.0/os/i386/StartCom/RPMS/compat-libstdc++-33-3.2.3-47.3.i386.rpm

rpm -ivh compat-libstdc++-33-3.2.3-47.3.i386.rpm

这个包居然没有其它依赖，顺利安装完成，重新运行吧：

./PE2650_BIOS_LX_A21.BIN

……说明文字……按q跳过

Collecting inventory...

...............

Running validation...

BIOS

The version of this Update Package is newer than the currently installed version.

Software application name: BIOS

Package version: A21

Installed version: A13

Continue? Y/N:y

Executing update...

WARNING: DO NOT STOP THIS PROCESS OR INSTALL OTHER DELL PRODUCTS WHILE UPDATE IS IN PROGRESS.

THESE ACTIONS MAY CAUSE YOUR SYSTEM TO BECOME UNSTABLE!

........

The BIOS image file is successfully loaded. Reboot your system to complete the update. Do not shutdown, reset, power cycle or switch off your system before it has restarted.

Would you like to reboot your system now?

Continue? Y/N:N

The system should be restarted for the update to take effect.

[root@localhost ~]#

嗯，这正是我想要的结果了。

今晚去升级那台有两条2G内存的机器，初步定的计划是拿一块2650的装有redhat el5的硬盘，插进去开机改好ip，然后远程升级重启。

升级过程还算顺利，从A10版升级到了A21版，但是并没有能解决2G内存的问题。

想不到办法了，只能退回去换4根1G的。