Which UART baud rates are supported?

[JasonS 0]

Hi,

I try the UART1 (/dev/ttyS1) on Tinker OS. I find that when I set baud rate to 230400, the data gets corrupted.

Is that a driver bug? or simply because the baud rate isn't supported?

Thanks in advance.

[tooz 47]

hello @JasonS, 

please set the baud rate to 115200 instead of 230400.

[JasonS 0]

Hi, @tooz

Based on the spec of rk3288, I think it should be able to support baud rate higher than 115200.
I need to communicate with another module with 230400.

I also tried that on Tinker Board 2S and the incoming text is correct but the sent data from Tinker Board is corrupted.

the dmesg from Tinker Board 2S is something like

invalid destination resolution act_w = 0, act_h = 0
rga: req argument is inval
ttyS0 - failed to request DMA, use interrupt mode

I have tried another dev board Rock Pi 4 which is also based on rk3399 and that works well with 230400.