I can only recommend if you have a functioning Linux system that you might try to compile a 2.4.18 or 19 kernel with the support desired. In the ATA/IDE/MFM/RLL device section under conrollers there is a section for IDE RAID controllers. It offers, Promise software RAID (Fasttrak) support. You might also turn on the following: Generic PCI IDE support, Generic PCI bus-master DMA support, Use PCI DMA by Default, and enable the Promise PDC202[....] chipset support.
If you use the "make menuconfig" type configuration, you can select the "Help" option and review some of the notes on the various options. Also, the source code files might provide some additional hints to support the controller. I think the HowTo for RAID covers Linux software RAID and not hardware controllers.
The Promise website offers support for four Linux distros, but not Slack. However, one of them might be adaptable to Slack.
To get your kernel to boot from the iso CD you would probably have to reauthor the CD as well. Copy your new kernel over say the bare.i kernel and try it. Or use the kernel on a diskette and make the five root system disks to provide a root file system. If this is an additional IDE card, I suppose you could install another hard disk temporary on the main bus and install. Build your new kernel and boot it. Then use that system to install to the RAID array or transfer your working system to the RAID array and remove the other hard disk.
I use the LInux software RAID on my primary and secondary IDE controllers. I also have just a Promise Ultra66 PCI card for other IDE devices, like CDROMS, tape drive, and zip drive. I normally have to use a transfer process to install Slack. The Slack setup program does not allow the use /dev/md devices as an install option. I did modify the setup script once and hard code the device /dev/md0 into the list once. But I don't think I wanted to do that on every distribution. If you want to use Linux software RAID I can explain more if you like.
This site, LQ, has a hardware forum you might try searching or posting a question. Someone there might be have experience with the controller with Linux. For myself, I have only used the card on Win2K Pro servers because Microsoft does not support root level RAID.
Perhaps the info has been of some small help.
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