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Hardware testing of a board using the Armada 385 has shown that an impedance threshold setting of 0x7 performs better in an eye-diagram test than with Marvell's recommended value 0x6. As other boards may still perform better with Marvell's reccomended value, a configuration option is added with a default value of 0x6. Signed-off-by: Joshua Scott <joshua.scott@alliedtelesis.co.nz> Reviewed-by: Stefan Roese <sr@denx.de>