In RHEL6.4 ipmi_si is built into the kernel instead of a loadable module, boot is delayed due to waiting for a timeout.

Issue

• In newer Red Hat Enterprise Linux (RHEL) 6 ipmi_si is build into the kernel instead of loadable module, boot is delayed due to waiting for a timeout.
• Our old workstations utilize a Realtek R8168DP LAN chip. This PCI device also shows up as an IPMI interface on different PCI function number. That means, that ipmi_si gets active and scans the IPMI bus for devices. Unfortunately there are no devices on that IPMI bus so the boot process is blocked until ipmi_si reaches its timeout (2 minutes). In the past the problem was easy to avoid by blacklisting ipmi_si on those workstations. How to do this now that ipmi_si is build into the kernel?