This is the FAQ for the ["PowerPC"] port.
What kernel to use ?
Benjamin Herrenschmidt maintained a PPC-specific branch for a long time. More information can be found on [http://ppckernel.org ppckernel.org].
Use of 2.6 is recommended for new hardware, as support for PPC hardware has been discontinued in 2.4 series. Using 2.4 kernel is _strongly discouraged_