Attempts to read the nonexistent registers results in bus errors.
Either use registers that exist, or don't do the access as appropriate.
Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12502/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>