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This patch finally adds the support for vuart console. It adds two new fields in the console initialization: - optional - use_gnttab optional flag tells whether the console is optional. use_gnttab tells whether the ring buffer should be allocated using grant table. The VUART console is enabled ony for ARM. Signed-off-by: Bhupinder Thakur <bhupinder.thakur@linaro.org> Acked-by: Wei Liu <wei.liu2@citrix.com>