Accessing another card's memory from my driver

Hello,

I have a system with two different PCI cards. I am writing the driver for one of those cards. However I have the source for the other driver.

My requirement is to access the memory of other PCI device (other device has it's own memory) from my driver.
How to do this?
Are there any restrictions to do so?

Have a nice time.
Regards
Arun

__________________________________________________
Do you Yahoo!?
Yahoo! Mail Plus - Powerful. Affordable. Sign up now.
http://mailplus.yahoo.com