I think you're in for an uphill battle. I have a SOYO DRAGON KT333 Ultra with the HPT372 chipset, have been trying to install Redhat 8.0
First off, I have used the highpoint RAID controllers with Linux before, and had a little bit of trouble setting it up but eventually got it. Highpoint usually has some pretty good drivers and docs at their website here:
Unfortunately, they have only gotten up to the 7.3 version of RedHat and 8.0 will NOT work on these versions.
So, I have been having a huge nightmare with this install now for about 7 weeks. I did get it up and running for a bit but it had a dirty shutdown and no matter what i did with fsck, it would not get past the system check on the next reboot and here I am in the same boat again with a new install attempt.
Basically I am saying that I have had PLENTY of experience with this hardware/OS combo and I would almost say:
"abandon hope all ye who enter here"
however, all is not lost.
Basically, if you want to install Redhat 8.0 onto a RAID that you are setting up on the Highpoint bios (by using the ctrl-h access and then creating the RAID) you're most likely in for a huge battle.
My honest suggestion here is to scrap the RAID that you set up with the hpt372. Simply set one of your drives as a boot disk and then use the Redhat install to create a software RAID with the OS controlling it.
I am currently looking at a screen on the other computer that is about 40% finished this process, so I should be able to let you know by the end of the night how it went.