If im not misstaken, the LSI module support built into the linux kernel supports all LSI Megaraid products, wether they are SCSI, Sata or SAS. I have had no issues accessing PERC6 controllers with most linux based bootcds, i dont have a SRC42U handy to test with at the moment.
To be on the "safe" side, i would suggest you simply download the trial and create a Rescue CD, boot your hardware from it to verify access to your controllers. The LSI controllers are very mainstream and i doubt they would not be supported but i cant guarantee. If you dont have time to test, i can atleast verify the PERC6 within a few days.