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Switch the alpha target from the old unassigned_access hook to the new do_transaction_failed hook. This allows us to resolve a ??? in the old hook implementation. The only part of the alpha target that does physical memory accesses is reading the page table -- add a TODO comment there to the effect that we should handle bus faults on page table walks. (Since the palcode doesn't actually do anything useful on a bus fault anyway it's a bit moot for now.) Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Message-Id: <1502196172-13818-1-git-send-email-peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>