If devicetree configures pinmux of MCO1 & MCO2 onto PI11 & PG2 both UBoot & kernel lock up on start-up.

[Spamfast]

We're using Ecosystem 2.1.0 still (I know!).

I'm using the CubeMX autogen code i.e.

rcc_pins_mx: rcc_mx-0 {
		u-boot,dm-pre-reloc;
		pins1 {
			u-boot,dm-pre-reloc;
			pinmux = <STM32_PINMUX('G', 2, AF1)>; /* RCC_MCO_2 */
			bias-disable;
			drive-push-pull;
			slew-rate = <1>;
		};
		pins2 {
			u-boot,dm-pre-reloc;
			pinmux = <STM32_PINMUX('I', 11, AF0)>; /* RCC_MCO_1 */
			bias-disable;
			drive-push-pull;
			slew-rate = <0>;
		};
	};
 
	rcc_sleep_pins_mx: rcc_sleep_mx-0 {
		u-boot,dm-pre-reloc;
		pins {
			u-boot,dm-pre-reloc;
			pinmux = <STM32_PINMUX('G', 2, ANALOG)>, /* RCC_MCO_2 */
					 <STM32_PINMUX('I', 11, ANALOG)>; /* RCC_MCO_1 */
		};
	};
 

If this is in U-Boot's devicetree, U-Boot locks up with no message on start-up.

If I take it out of U-Boot's devicetree but leave it in the kernel's, U-Boot starts up fine but the kernel locks up, again with no panic or other output.

[Olivier GALLIEN]

Hi @Spamfast​ ,

I guess you are facing a known issue while configuring MCO pin on MP15 with release < 4.0

Please have a look to post

https://community.st.com/s/question/0D53W00001Co3JdSAJ/how-to-configure-device-trees-tfaubootkernel-to-output-the-mco2-clock-on-an-external-pin-of-the-stm32mp15x

And let me know if it help !

Olivier

[PatrickF]

HI @Spamfast​ 

did you progress on your issue ?

Regards,

In order to give better visibility on the answered topics, please click on 'Select as Best' on the reply which solved your issue or answered your question. See also 'Best Answers'