Is it possible to use 12.75Mbps baud rate for uarta or uartb?

[brian.wu]

Hi,

Is it possible to config the parent clock to 204M for uarta and uartb?

Currently, the maximum clock rate is 68000000 so that we can only archive the 4.25Mbps baud rate.

root@nvubuntu:/home/test# cat /sys/kernel/debug/bpmp/debug/clk/uarta/max_rate
68000000
root@nvubuntu:/home/test# cat /sys/kernel/debug/bpmp/debug/clk/uarta/possible_parents
pllp_out0 clk_32k clk_m
root@nvubuntu:/home/test# cat /sys/kernel/debug/bpmp/debug/clk/uartb/max_rate
68000000
root@nvubuntu:/home/test# cat /sys/kernel/debug/bpmp/debug/clk/uartb/possible_parents
pllp_out0 clk_32k clk_m

BR
Brian

[KevinFFF]

Hi brian.wu,

Are you using the devkit or custom board for Orin Nano?
What’s your Jetpack version in use?

It seems the pllp_out0 clock has been used by default and the max_rate is 68MHz
The maximum clock rate is configured in bpmp but it is not allowed to configure it to 204MHz.

[brian.wu]

Hi Kevin,

I use Jetpack 5.1.3 and custom board.