I believe only CentOS-6.x and newer are currently supported. I am in a
similar predicament where I'd like to port some development CentOS5.x
systems and am unable to.
With CentOS 5.11 it's possible to get some early kernel output by
setting the "earlyprintk=serial" kernel command-line option. But, this
disappears when the switchover to the main console happens.
I'd be keen to learn what issues exist preventing this and see if I can
help in any way to get older CentOS systems supported.
I suspect that Centos 5 does boot, but without console output there's
not much that can be done :( It might need some Linux kernel builds and
insertion of debug to work out why the console settings from grub aren't
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