IBM eServer System p uses YABOOT as its boot loader. YABOOT uses
/etc/yaboot.conf as its configuration file. Confirm that the file contains an
image section with the same version as the kernel package just installed, and likewise for the
boot=/dev/sda1 init-message=Welcome to Red Hat Enterprise Linux! Hit <TAB> for boot options
partition=2 timeout=30 install=/usr/lib/yaboot/yaboot delay=10 nonvram
Notice that the default is not set to the new kernel. The kernel in the first image is booted by default. To change the default kernel to boot either move its image stanza so that it is the first one listed or add the directive
default and set it to the
label of the image stanza that contains the new kernel.
Begin testing the new kernel by rebooting the computer and watching the messages to ensure that the hardware is detected properly.