查了一下，好像intel官方不支持空槽。
http://www.intel.com/support/network/sb/cs-009229.htm
The Intel® PRO/1000 T Server and Intel® PRO/1000 F Server Adapters
do not support Intel® Boot Agent. No flash chip is available for the empty socket.
Note:
There is no after-market flash chip, at this time, which can be added to the Intel gigabit adapters. Additionally most motherboard implementations of Boot Agents do not include gigabit support at this time.
http://www.intel.com/support/network/adapter/pro100/bootagent/sb/CS-008448.htm
Please note that even though a part may be listed here, it may not work on all the hardware supported by IBAUTIL.
Some Flash listed here are for PRO/100 line use only, and can not be used on PRO/1000 adapters. Please consult the appropriate hardware design documentation to find out which flash devices will work with what controllers.
