It seems the High point produced drivers, which are really a pack of add in files and a special boot disk, are available:
here
Most of the stuff online warned people away from trying as there wasn't apparently any support in the kernel for this controller. Then again these pages are old enough to be in google, and are therefore archaic, so its probably just a matter of making a custom bootdisk.
I can't find anything specific to hpt in the kernel changelogs since 2.4.7, but it might have been inclusive of something greater.
Luck,
Finegan