you can open the extra.lzma with 7zip and check rc.modules and the *.ko files in "modules" HPE uses broadcom or intel and both are there you can also use iLO's virtual com port to check you the serial console using putty, that would give you a hint about whats going on   i tested the hpsa.ko driver with a p410 lately, the p410 can only use raid mode so i created a raid0 and raid5 to test if its working and it did, so maybe start with that in theory the p420 can be swit