ARM: imx7d: add low level debug uart support
Add low level uart debug support for imx7d Signed-off-by: Frank Li <Frank.Li@freescale.com> Signed-off-by: Bai Ping <b51503@freescale.com> Signed-off-by: Anson Huang <b20788@freescale.com> Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
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