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When booting kernel-rt-vanilla-2.6.33.9-rt31.64 on boxes which needs firmware, the firmware loader cannot find the required firmware files. This behaviour can be found on boxes needing the bnx2 driver (ie,ibm-x3950m2-01.rhts.eng.bos.redhat.com or dell-per610-01.lab.bos.redhat.com). The theory is that the kernel-rt{,-debug,-trace} kernels are patched and contains updated bnx2 drivers which loads a newer firmware. The rt-vanilla kernel is shipped with the new firmware and not the old firmware which its not updated bnx2 driver expects to use.
MRG-1 on Red Hat Enterprise Linux 5 reached it's end of life on March 31, 2014. Because this issue is against the MRG-1 release, we are closing it WONTFIX. If you believe this is still an issue on our most recent MRG-2.5 3.10 kernel, please file a new issue for tracking.