I may have had some (limited) success here. I made a USB flash drive using the Dell utility. First I made one using the 422.exe (server 2003) drivers. Using a newly made ISO with Win XP Pro-3 only (no drivers) and tried again. Pressed F6. I eventually got the same message "cannot find percas.sys".
I tried again, this time I made the flash drive using the 426.exe (XP) drivers. It took them and started to load. Asked to format drive (selected NTFS) and after a few seconds or more loading it now says "insert the disk labled Perc5...raid controller...(win xp)" into drive A and press enter.
I removed the flash drive and, on a computer that has no floppy A drive I was able to reset the flash drive from E to A.
Reinstalled it but pressing enter I got nothing. I'm going to keep trying but hos do I set up the USB in bios (F2)?
Do I set it to Floppy or Auto? The third choice is hard drive and I assume not this.
This may just work if I can get by this.