[BPI-M1] UART only works with baud rates of 9600 and 115200 but not higher speeds

Hello everyone,

Using BPI-M1 here.
We are currently connecting a device to UART 7 on J12 and it works great at baud rates of 9600 and 115200. Works as expected. no problems at these speeds at all.

But when we try to communicate at higher speeds and test the signals using a scope we see that the actual baud rate is different. for example when try to set the speed to 460,800 the actual speed we get is 500,000.

The device we connected to the BPI via UART works great at higher speeds. we tested that and made sure its not the source of the problem.

Is there some additional setting that I'm missing for the UART baud rate to work at higher speeds than 115200 ?

Thank you!