Probably not. :-(

http://www.8052.com/forum/read.phtml?id=55316
is about using the internal memory on another processor - it is not a memory device per se

http://www.8052.com/forum/read.phtml?id=53910
is about interfacing external memory to a different processor.
The specific details may or may not apply to your particular processor - you'd have to check it out in your datasheet.

http://www.8052.com/forum/read.phtml?id=55089
is about serial EEPROM.
This would certainly not be a good way to store your ethernet packets!