AGP force use of scratch page

From: Jerome Glisse
Date: Thu Apr 01 2010 - 10:54:56 EST


Attached is a patch which force the use of the scratch page
for all AGP bridges, only tested on SIS or Intel bridges,
i am bit skeptical for alpha bridges. If you prefer i can
just force this for x86 & PPC bridge for which we can easily
get tester.