STM32MP135: Boot stops if vdd or vdd_ddr defined as fixed-regulator to tf-a device tree

[jhi]

As the title says, when I add the (with or without "regulator-always-on")

 

vdd: vdd {
		compatible = "regulator-fixed";
		regulator-name = "vdd";
		regulator-min-microvolt = <3300000>;
		regulator-max-microvolt = <3300000>;
	};

 

or

 

vdd_ddr: vdd_ddr {
		compatible = "regulator-fixed";
		regulator-name = "vdd_ddr";
		regulator-min-microvolt = <1350000>;
		regulator-max-microvolt = <1350000>;
		regulator-always-on;
	};

 

 the boot stops 

 

NOTICE: CPU: STM32MP135D Rev.Y
NOTICE: Model: MYIR STM32MP135F Board
ERROR: nvmem node board_id not found

 

without any further messages. Why?

 

JHi

 

[debugging]

I had similar problems having more than 3 regulator entries in the dts. for STM32MP1 ECO 5.0  (Discrete powered board).  no explanation could be found. So reduced them and it booted..

 

 

[Olivier GALLIEN]

Hi @jhi @debugging ,

 

Do you know these articles from Myirtech : 

 

Bring up the STM32MP135x - Share Training Course (I)

Bring up the STM32MP135x - Share Training Course (II)

 

let us know if it help 

 

Olivier