UART2_M0 for ROCK 5C

hkkok · March 5, 2025, 3:11am

Hi! Recently I’ve enable uart2_m0 /dev/ttyS2 on ROCK 5C RK3588S2 but i found out the base baud rate is 1500000. Is it possible to change the setting to 152000 that can compatible with my ttl serial modem. Thanks

Nasca · March 5, 2025, 12:49pm

You can try to change the baud rate of this serial port in dts， set current-speed under the uart2 node

github.com

radxa-pkg/radxa-overlays/blob/main/arch/arm64/boot/dts/rockchip/overlays/rk3588-uart2-m0.dts

#include "rk3588-disable-fiq-debugger.dts"

/ {
	metadata {
		title = "Enable UART2-M0";
		compatible = "radxa,rock-5a", "radxa,rock-5b", "radxa,rock-5b-plus", "radxa,rock-5c", "radxa,rock-5d", "radxa,rock-5t", "radxa,nx5-io", "radxa,cm5-io", "radxa,cm5-rpi-cm4-io";
		category = "misc";
		exclusive = "GPIO0_B5", "GPIO0_B6", "fiq_debugger";
		description = "Enable UART2-M0.
On Radxa ROCK 5A this is TX pin 8 & RX pin 10.
On Radxa ROCK 5B this is TX pin 8 & RX pin 10.
On Radxa ROCK 5B+ this is TX pin 8 & RX pin 10.
On Radxa ROCK 5C this is TX pin 8 & RX pin 10.
On Radxa ROCK 5D this is TX pin 8 & RX pin 10.
On Radxa ROCK 5T this is TX pin 8 & RX pin 10.
On Radxa NX5 IO this is TX pin 8 & RX pin 10.
On Radxa CM5 IO this is TX pin 8 & RX pin 10.
On Radxa CM5 RPI CM4 IO this is TX pin 8 & RX pin 10.
";
	};

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hkkok · March 6, 2025, 2:26am

Hi! Nasca, i’ve tried to change the /usr/src/radxa-overlays-0.1.12/arch/arm64/boot/dts/rockchip/overlays/rk3588-uart2-m0.dts but the base_baud still 150000. Please find the attachment for your reference.

Nasca · March 7, 2025, 1:57am

Have you reloaded this overlay?

hkkok · March 7, 2025, 2:21am

Yes, I’m using this command u-boot-update.

hkkok · March 10, 2025, 7:52am

Hi! Nasca, how to reload overlay?

Nasca · March 11, 2025, 2:42am

I just repdoduce it just now, let me see how to resolve it.

Nasca · March 11, 2025, 2:44am

stty -F /dev/ttyS2 speed 115200 cs8 -parenb -cstopb -echo

hkkok · March 12, 2025, 5:00am

Ok noted. Thank you.