How to install Vendor specific HBA Driver when installing 2008 to

I am installing Windows server 2008 Standard x64 on HP BL20P G3 machin to

boot from san. Earlier version of windows servers, there is a moment to

press F6 to specify vendor specific driver at the very beginning of

installation. But for 2008, I do not see it. I need to install it to the

disk on the san to boot from. How can I do it?

thank you,