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powerpc/ppc476: Disable BTAC
authorAlistair Popple <alistair@popple.id.au>
Wed, 6 Aug 2014 07:03:09 +0000 (17:03 +1000)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Wed, 13 Aug 2014 05:13:42 +0000 (15:13 +1000)
commit97b3be1e9404f4c1645f3286428abd4d2052041e
tree31e79eebdf8c4ec0cb539c7bcd6d75ee7f889034tree | snapshot (tar.gz zip)
parent763fe0addb8fe15ccea67c0aebddc06f4bb25439commit | diff
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: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
arch/powerpc/kernel/head_44x.S diff | blob | blame | history