LSI RAID controllers on non-amd64

[John Klos <john%ziaspace.com@localhost>]

After failing to get Areca RAID controllers working properly on an Alpha 
system:

http://mail-index.netbsd.org/port-alpha/2018/11/02/msg000900.html

I tried an LSI controller, which works well under amd64:

mfi0 at pci2 dev 0 function 0: vendor 0x1000 product 0x9276
mfi0: interrupting at ioapic1 pin 8
mfi0: LSI MegaRAID SAS 9271-4i version 23.33.0-0023
mfi0: logical drives 1, 1024MB RAM, BBU not present
scsibus0 at mfi0: 64 targets, 8 luns per target
...
sd0 at scsibus0 target 0 lun 0: <LSI, MR9271-4i, 3.45> disk fixed


On an Alpha system running NetBSD 8, though, the card isn't recognized 
properly:

ppb1 at pci2 dev 4 function 0: vendor 10b5 product 8112 (rev. 0xaa)
ppb1: PCI Express capability version 1 <PCI/PCI-X to PCI-E Bridge> x1 @ 2.5GT/s
pci3 at ppb1 bus 2
mfi0 at pci3 dev 0 function 0: vendor 0x1000 product 0x9276
mfi0: interrupting at dec 6600 irq 36
mfi0:  version
mfi0: logical drives 0, 0MB RAM, BBU not present
scsibus1 at mfi0: 64 targets, 8 luns per target

Shortly after this, the console spits out 3000+ messages:

stray 6600 irq 36

The kernel eventually finishes booting and the messages stop, but nothing 
can be found on scsibus1 and a scsictl scan doesn't find anything, either.

Is anyone using a hardware RAID controller on Alpha, and if so, what kind?

John Klos