Has anyone had any luck using a Debian-based OS on one of these?

I am having an issue where I reset my BIOS to it's factory settings, and changed the onboard SCU Support back to enabled, but am unable to use the MegaRAID. Any ideas?

My C22 throws the following warning in CIMC during POST:System Software event: Post sensor, SWRAID:Not enough memory available to shadow a legacy option ROM [0xA6A0] was asserted What does this mean, and how do I fix it?