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nerves_system_linkit linux-3.18.29 mt7688 999-baud_250000.patch
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linux-3.18.29/mt7688/999-baud_250000.patch 

--- a/drivers/tty/serial/serial_core.c

+++ b/drivers/tty/serial/serial_core.c

@@ -356,6 +356,9 @@ uart_get_baud_rate(struct uart_port *por

 	else if (flags == UPF_SPD_WARP)

 		altbaud = 460800;

 

+	if (tty_termios_baud_rate(termios) == 2500000)

+		return 250000;

+

 	for (try = 0; try < 2; try++) {

 		baud = tty_termios_baud_rate(termios);