[CentOS] Centos 6.4 on Xserve, IPMI error

Hello!

I'm trying to install Centos 6.4 64 bit on this Xserve:
http://www.everymac.com/systems/apple/xserve/specs/xserve-intel-xeon-2.8-eight-core-specs.html

I got a bootloader from:
http://blog.christophersmart.com/2009/07/23/linux-on-an-apple-xserve-efi-only-machine/
as none of the official Centos releases (full, minimal, network 64 bit) boot on this machine.
They all crash when loading the bootx64.conf.

I have built a USB stick with a working bootx64.efi, grub.cfg, together with an initrd and a vmlinuz
from the isolinux folder.
These seem to get me into booting a kernel until something called IPMI is starting to throw
errors at me:

Console: switching to colour frame buffer device 128x48
fb0: VESA VGA frame buffer device
ipmi message handler version 39.2
IPMI System Interface driver.
ipmi_si 0000:09:00.4: enable device (0002 -> 0003)
ipmi_si 0000:09:00.4: PCI INT C -> GSI 16 (level, low) -> IRQ 16
ipmi_si: Adding PCI-specified kcs state machine
ipmi_si 0000:09:00.7: enable device (0000 -> 0003)
ipmi_si 0000:09:00.7: PCI INT D -> GSI 17 (level, low) -> IRQ 17
ipmi_si: Adding PCI-specified bt state machine
ipmi_si: Trying PCI-specified kcs state machine at mem address 0x90841000, slave address 0x0 irq 16
IRQ 16/ipmi_si: IRQF_DISABLED is not guaranteed on shared IRQs
   Using irq 16
ipmi: Found new BMC (man_id: 0x00003f, prod_id: 0x0003, dev_id: 0x20)
IPMI kcs interface initialized
ipmi_si: Trying PCI-specified kcs state machine at mem address 0x90840000, slave address 0x0 irq 17
Refined TSC clocksource calibration: 2792.999 MHz.
Switching to clocksource tsc
IPMI BT: timeout in XACTION [ 	B_BUSY ] 1 retries left
IPMI BT: timeout in XACTION [ 	B_BUSY ]
failed 2 retries, sending error response
IPMI: BT reset (takes 5 secs)
IPMI BT: timeout in XACTION [ 	B_BUSY H2B ]
failed 2 retries, sending error response
IPMI: BT reset (takes 5 secs)
IPMI BT: timeout in XACTION [ 	B_BUSY H2B ]
failed 2 retries, sending error response
IPMI: BT reset (takes 5 secs)
IPMI BT: timeout in XACTION [ 	B_BUSY H2B ]
failed 2 retries, sending error response
IPMI: BT reset (takes 5 secs)
IPMI BT: timeout in XACTION [ 	B_BUSY H2B ]
failed 2 retries, sending error response
IPMI: BT reset (takes 5 secs)

then the screen goes to black and the machine doesn't respond to anything anymore...


Can anyone please help me with this? Maybe just point me in a direction where to find a solution?
I've been googling for a few days now without much results...

thanks in advance

Arno Beekman