ftp://ftp.mn-linux.org/linux/redhat/linux/ibm/

This tree includes versions of Red Hat Linux 7.1 for IBM z (64-bit),
i (32-bit) and p (32-bit) Series systems.  Red Hat Linux 7.1 for IBM i
and p Series are platform specific PowerPC implementations, and do not
support other PowerPC architectures or platforms at this time.  Please
contact Red Hat at http://www.redhat.com for further information
regarding these offerings.

MAYBE there will be a redhat for PPC, other then IBMs.
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