ARM: hw_breakpoint: don't try to clear v6 debug registers during boot
v6 cores do not provide a way to clear the debug registers without first enabling monitor mode, meaning that we could take spurious debug exceptions. Instead, rely on the registers being in a sane state when we boot as they are defined to be disabled out of reset anyway. Tested-by: NStephen Boyd <sboyd@codeaurora.org> Signed-off-by: NWill Deacon <will.deacon@arm.com>
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