JP5.1.3 vs JP 6.1 UART serial device mapping

[bsp_dev]

Hi,
I’m having trouble to enable the second uart in our system (custom carrier board)

With JP5.1.3 everything worked fine. With JP6.1 the second UART is not working.
I asked about this in the following thread:

Verify Orin NX UART /dev/THS0 , /dev/THS1

Hi, We use Orin NX on a custom carrier board. I try validate the UART outputs. When we worked with JP5.1.3 our hardware team said we need to use /dev/THS0 and /dev/THS1. Now we moved to JP6.1 (I don’t know if that changed something) I connect the Orin to my windows host via debug channel and see the debug messages. I connect the Orin to my windows host via other 2 serial ports and try to echo “hello” > /dev/ttyTHS0 or echo “hello” > /dev/ttyTHS1 and see nothing. dmesg with grep tty: d…

but I think I found a problem and wish to verify that’s the cause:

In JP5.1.3 the /dev/ttyTHS0 is actually @3100000 and it worked.
In JP6.1 the /dev/ttyTHS1 is actually @3100000 and it works.

in JP5.1.3 the /dev/ttyTHS1 is actually @3110000 and it worked
in JP6.1 the /dev/ttyTHS2 is actually @3140000 and its not working.
(in JP6.1 we have /dev/ttyTHS1 and /dev/ttyTHS2 instead /dev/ttyTHS0 and /dev/ttyTHS1 like in JP5.1.3)
So is there a problem with the mapping?

source:

Thanks

[KevinFFF]

Hi bsp_dev,

@bsp_dev

in JP6.1 the /dev/ttyTHS2 is actually @3140000 and its not working.
(in JP6.1 we have /dev/ttyTHS1 and /dev/ttyTHS2 instead /dev/ttyTHS0 and /dev/ttyTHS1 like in JP5.1.3)

Some redundant serial nodes have been removed from JP6.
Please just refer to the address rather than the numbering of the node like /dev/ttyTHS*.

Are you trying to use serial@3110000 in JP6 which is from M.2 Key E?
Please share the full dmesg and device tree for further check.

[bsp_dev]

So I need to use whatever device that is mapped to the @3110000 node?

I “need” to use that since this worked in JP5.1.3. and we ue the same hardware.

dt:
dt.txt (330.6 KB)

dmesg:
dmesg.txt (59.3 KB)

In our case 3110000 is /dev/ttyS0 but according to dmsg its not a “TEGRA_UART”.
If I use it I receive 0xff in the other side.

[KevinFFF]

		serial@3110000 {
			resets = <0x03 0x65>;
			interrupts = <0x00 0x71 0x04>;
			clocks = <0x03 0x9c>;
-			compatible = "nvidia,tegra234-uart\0nvidia,tegra20-uart";
+			compatible = "nvidia,tegra194-hsuart";
			status = "okay";
			reg = <0x00 0x3110000 0x00 0x10000>;
		};
..
	aliases {
		i2c3 = "/bus@0/i2c@3190000";
		nvdla1 = "/bus@0/host1x@13e00000/nvdla1@158c0000";
		i2c1 = "/bus@0/i2c@c240000";
		i2c8 = "/bus@0/i2c@31e0000";
		i2c6 = "/bus@0/i2c@31c0000";
		serial1 = "/bus@0/serial@3100000";
+		serial3 = "/bus@0/serial@3110000";
		tegra-camera-rtcpu = "/rtcpu@bc00000";

Please configure the lines as above in device tree, and you should get /dev/ttyTHS3 available for serial@3110000 after reboot.

[bsp_dev]

That worked. Thanks!