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There was a patch in the 2.6.24 RT kernel to create a /dev/rtc device so that the hwclock command would work during system startup. It appears to be missing from the 2.6.33 kernel. Without the patch, this error occurs: Welcome to Red Hat Enterprise Linux Client Press 'I' to enter interactive startup. Cannot access the Hardware Clock via any known method. Use the --debug option to see the details of our search for an access method. After the system boots and the udev rule created the link from /dev/rtc0 to /dev/rtc, the hwclock command works correctly.
Created attachment 478318 [details] console log showing the error
Verified by code review and checking boot log. Found bz465837-rtc-compat-rhel5.patch-ported-to-V2.patch applied to the kernel-rt-2.6.33.7-rt29.53.src.rpm. When booting kernel-rt-2.6.33.7-rt29.47, this message is shown during the boot process: ----------------------------------------------------------------- Cannot access the Hardware Clock via any known method. Use the --debug option to see the details of our search for an access method. ----------------------------------------------------------------- This error is not happening when booting kernel-rt-2.6.33.7-rt29.53.