Problems booting from onboard SATA with PCI SATA controller installed

I have a K7N2 Delta-ILSR motherboard (BIOS v 7.8), and my Windows XP installation is on a single drive attached to the onboard Promise 378 SATA RAID controller. I have a PCI Promise TX2200 SATA RAID controller installed, currently in PCI slot 5. The OS boots normally off the onboard controller if I do not have my RAID0 array attached to the PCI controller, but I get disk boot failure messages if I have the RAID0 attached to the Promise TX2200.
I have tried putting the PCI controller in different slots to change IRQ channel routing, tried changing boot order in the BIOS, and even tried assigning specific IRQ priorities to the slot with the Promise TX2200.
My basic question is this: how do I get this motherboard to boot from the onboard controller while I have my RAID0 attached to the add-on PCI controller?

Well, Promise got back to me. They were insightful enough to tell me what I already knew and that they didn't support what I was trying to do:
Quote
Case Problem: I have an MSI K7N2 Delta-ILSR Socket A motherboard with an onboard Promise FastTrack 376 SATA RAID controller. I wish to continue booting my OS from a single SATA drive on this controller, while using a RAID0 array on my FastTrack TX2200 controller. When the TX2200 is installed and the array is attached, it is detected as C: by the motherboard BIOS and the active boot drive as D:. The TX2200 is detected during boot (after POST) first, the onboard contoller second. I have tested the TX2200 in...
Case Solution: Hi Sorry for the late reply. Are you by any chance running both the FT 376 embedded controller along with the FT TX2200 if so than you will run into bios or driver conflict when both controllers in the system. Promise only recommend and support one cards pre system. Thank you.
... and MSI
Quote
Thank you for contacting MSI Technical Support.
As onboard SATA controller and PCI controller are both promise. It exits compatibility between them. You could try the following procedures to check if they could solve the issue:
1. Please contact the PCI card vendor to ask if there is relative firmware update
2. Please disable all the onboard devices which you don't want to use in bios setup.
3. You could try different MB bios version to have a check. You could download these versions from here.
Please feel free to let us know if you still have any further issues or inquiries
So that leaves me 3... downgrading my BIOS is not worth the risk just to make this work. Looks like its time for a full migration plan so this issue becomes moot.

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