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On the i.MX8M SoCs, TF-A doesn't itself initialize the UART, but depends on BL2 to set it up beforehand. To allow using the same TF-A binary on boards with different UART assignment, TF-A On i.MX8M M/N/P supports dynamically determining the UART in use. The code is also applicable to the i.MX8MQ, so enable it there too. Change-Id: I9ba70f7068e762da979bd103390fa006c3a5d480 Signed-off-by: Leonard Göhrs <l.goehrs@pengutronix.de> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>