powerpc/ppc476: Disable BTAC
This patch disables the branch target address CAM which under specific circumstances may cause the processor to skip execution of 1-4 instructions. This fixes IBM Erratum #47. Signed-off-by: NAlistair Popple <alistair@popple.id.au> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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