From: TsiChung Liew Tsi-Chung.Liew@freescale.com
If bus frequency is larger than 133MHz, the UART cannot output baudrate at 115200 correctly.
Signed-off-by: TsiChung Liew Tsi-Chung.Liew@freescale.com --- drivers/serial/mcfuart.c | 5 ++++- 1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/drivers/serial/mcfuart.c b/drivers/serial/mcfuart.c index 88f3eb1..fca76bd 100644 --- a/drivers/serial/mcfuart.c +++ b/drivers/serial/mcfuart.c @@ -64,7 +64,10 @@ int serial_init(void)
/* Setting up BaudRate */ counter = (u32) (gd->bus_clk / (gd->baudrate)); - counter >>= 5; + counter = (counter + 31) >> 5; + + if ((gd->bus_clk > 133333333) && (gd->baudrate >= 115200)) + counter++;
/* write to CTUR: divide counter upper byte */ uart->ubg1 = (u8) ((counter & 0xff00) >> 8);