target-ppc: Remove vestigial PowerPC 620 support
The PowerPC 620 was the very first 64-bit PowerPC implementation, but hardly anyone ever actually used the chips. qemu notionally supports the 620, but since we don't actually have code to implement the segment table, the support is broken (quite likely in other ways too). This patch, therefore, removes all remaining pieces of 620 support, to stop it cluttering up the platforms we actually care about. This includes removing support for the ASR register, used only on segment table based machines. Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au> Signed-off-by: NAlexander Graf <agraf@suse.de>
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