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PPC support was never good in any distro, I'm surprised they had it so long. There were PPC specific distros such as Yellow Dog Linux but they didnt support many ppc architecture out of the box.
For some old risc hardware you had to apply like 30 patch for 2.4 kernel and do additional hacking just to boot the box and even after that not all hardware in it was supported.
Anyways whether there is ppc distro or not you can always compile manually most of the gnu softwares for it or make your own distro.