I'm using 9211-8i and it works (IR mode) for me on ESXi+vt-d. Are you using baremetal or vt-d? Doesn't show in DSM or doesn't detect the disk?
Have you been able to get disks conected to the 9211-8i to start from Disk1-Disk8?
Do i need to blacklist any other drivers to make sure theres no unused slots before the disks on the raid card?
Also , Will flashing IT firmware instead of IR benifit in any way?
You have to blacklist the boot image disk (ata_piix) using rmmod GRUB option.
Put the following lines in your /boot/grub/menu_alpha.lst
kernel /zImage rmmod=ata_piix,r8169,r8169_new
To load the wireless or multimedia drivers, put the following lines in /etc/rc.local.
#!/bin/sh
source /etc/rc.subr
source /.gnoboot/modules.d/03-wifi.conf
source /.gnoboot/modules.d/05-media.conf
SYNOLoadModules $WIFI_MOD
SYNOLoadModules $MEDIA_MOD
If video station still doesn't work, then you have to figure it out by yourself. I don't support anything related to DSM.