How to set fan pwm io low/high in the early boot stage?

Robotics & Edge Computing Jetson & Embedded Systems Jetson Orin Nano
1

Is there any configuration available to set fan pwm io low/high when in NVIDIA’s private boot loader?

Something like uboot env?

3

Try to adjust this block in tegra234-mb1-bct-pmic-p3767-0000-a02.dts and reflash the board.
This is the earliest setting for bootloader to control FAN pwm.

thermal {
			block@0 {
				pwm;
				controller-id = <2>; /* PWM3 for Fan */
				source-frq-hz = <4800000>;
				period-ns = <45334>; /* 22 KHz */
				min-microvolts = <0>;
				max-microvolts = <5000000>;
				init-microvolts = <2500000>;
				pwm-clock-enable;
				enable;
			};
		};
	};
4

Is there any alternative way to change the value of IO high/low state beside reflash the bootloader, such as utilities to configure GPIO states dynamically under linux environment or bootloader comands to alter the value of env?

5

If you are talking about early boot stage, then no. Everything in early boot stage could only be configured by flashing.

6

I’ll try to flash dts related stuff. But no experience here.

7

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