TF-A halts with an exception during boot of simple device tree?

[ADeck]

I have built a device tree file using the details in wiki in CubeMX. I build with my custom machine using Yocto.

When I run the built TF-A binary I get the following output on UART4:

NOTICE:  CPU: STM32MP157CAD Rev.B
NOTICE:  Model: STMicroelectronics custom STM32CubeMX board
WARNING: VDD unknownINFO:    Reset reason (0x15):
INFO:      Power-on Reset (rst_por)
INFO:    Using USB
INFO:      Instance 2
INFO:    Boot used partition fsbl1
NOTICE:  BL2: v2.2-r2.0(debug):v2.2-dirty
NOTICE:  BL2: Built : 13:36:23, Oct 22 2019
PANIC at PC : 0x2ffd5f27
 
Exception mode=0x00000016 at: 0x2ffd5f27

Any idea what I am doing wrong?

Here is my very simple device tree

/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */
/*
 * Copyright (C) STMicroelectronics 2020 - All Rights Reserved
 * Author: STM32CubeMX code generation for STMicroelectronics.
 */
 
/* For more information on Device Tree configuration, please refer to
 * https://wiki.st.com/stm32mpu/wiki/Category:Device_tree_configuration
 */
 
/dts-v1/;
#include <dt-bindings/pinctrl/stm32-pinfunc.h>
#include <dt-bindings/clock/stm32mp1-clksrc.h>
#include <dt-bindings/soc/st,stm32-etzpc.h>
 
#include "stm32mp157.dtsi"
#include "stm32mp15xc.dtsi"
#include "stm32mp15xxad-pinctrl.dtsi"
/* !!! log : Warning - DDR not configured: unknown DDR dtsi  !!! */
/*#include "???-ddr.dtsi"*/
 
/* USER CODE BEGIN includes */
/* USER CODE END includes */
 
/ {
	model = "STMicroelectronics custom STM32CubeMX board";
	compatible = "st,stm32mp157c-toxic-mx", "st,stm32mp157";
 
	aliases {
		serial0 = &uart4;
	};
 
	chosen {
		stdout-path = "serial0:115200n8";
	};
	clocks {
		/* USER CODE BEGIN clocks */
		/* USER CODE END clocks */
 
		clk_lse: clk-lse {
 
			/* USER CODE BEGIN clk_lse */
			/* USER CODE END clk_lse */
		};
 
		clk_hse: clk-hse {
			st,bypass;
 
			/* USER CODE BEGIN clk_hse */
			/* USER CODE END clk_hse */
		};
	};
 
}; /*root*/
 
&pinctrl {
	uart4_pins_mx: uart4_mx-0 {
		pins1 {
			pinmux = <STM32_PINMUX('B', 2, AF8)>; /* UART4_RX */
			bias-disable;
		};
		pins2 {
			pinmux = <STM32_PINMUX('G', 11, AF6)>; /* UART4_TX */
			bias-disable;
			drive-push-pull;
			slew-rate = <0>;
		};
	};
 
	usb_otg_hs_pins_mx: usb_otg_hs_mx-0 {
		pins {
			pinmux = <STM32_PINMUX('A', 10, ANALOG)>; /* USB_OTG_HS_ID */
		};
	};
 
	/* USER CODE BEGIN pinctrl */
	/* USER CODE END pinctrl */
};
 
&pinctrl_z {
	/* USER CODE BEGIN pinctrl_z */
	/* USER CODE END pinctrl_z */
};
 
&rcc {
	st,csi-cal;
	st,hsi-cal;
	st,cal-sec = <60>;
	st,clksrc = <
		CLK_MPU_PLL1P
		CLK_AXI_HSI
		CLK_MCU_HSI
		CLK_PLL12_HSI
		CLK_PLL3_HSI
		CLK_PLL4_HSI
		CLK_RTC_LSI
		CLK_MCO1_DISABLED
		CLK_MCO2_DISABLED
	>;
	st,clkdiv = <
		1 		/*MPU*/
		0 		/*AXI*/
		0 		/*MCU*/
		0 		/*APB1*/
		0 		/*APB2*/
		0 		/*APB3*/
		0 		/*APB4*/
		0 		/*APB5*/
		0 		/*RTC*/
		0 		/*MCO1*/
		0 		/*MCO2*/
	>;
	st,pkcs = <
		CLK_CKPER_DISABLED
		CLK_ETH_DISABLED
		CLK_SDMMC12_DISABLED
		CLK_STGEN_HSI
		CLK_USBPHY_HSE
		CLK_SPI2S1_DISABLED
		CLK_SPI2S23_DISABLED
		CLK_SPI45_DISABLED
		CLK_SPI6_DISABLED
		CLK_I2C46_DISABLED
		CLK_SDMMC3_DISABLED
		CLK_USBO_USBPHY
		CLK_ADC_DISABLED
		CLK_CEC_DISABLED
		CLK_I2C12_DISABLED
		CLK_I2C35_DISABLED
		CLK_UART1_DISABLED
		CLK_UART24_PCLK1
		CLK_UART35_DISABLED
		CLK_UART6_DISABLED
		CLK_UART78_DISABLED
		CLK_SPDIF_DISABLED
		CLK_SAI1_DISABLED
		CLK_SAI2_DISABLED
		CLK_SAI3_DISABLED
		CLK_SAI4_DISABLED
		CLK_LPTIM1_DISABLED
		CLK_LPTIM23_DISABLED
		CLK_LPTIM45_DISABLED
	>;
};
 
&bsec{
	status = "okay";
	secure-status = "okay";
 
	/* USER CODE BEGIN bsec */
	/* USER CODE END bsec */
};
 
&etzpc{
	st,decprot = <
	/*"Non Secured" peripherals*/
	DECPROT(STM32MP1_ETZPC_DMA1_ID, DECPROT_NS_RW, DECPROT_UNLOCK)
	DECPROT(STM32MP1_ETZPC_DMAMUX_ID, DECPROT_NS_RW, DECPROT_UNLOCK)
	DECPROT(STM32MP1_ETZPC_UART4_ID, DECPROT_NS_RW, DECPROT_UNLOCK)
	DECPROT(STM32MP1_ETZPC_OTG_ID, DECPROT_NS_RW, DECPROT_UNLOCK)
	/*"Secured" peripherals*/
	DECPROT(STM32MP1_ETZPC_STGENC_ID, DECPROT_S_RW, DECPROT_UNLOCK)
	/*"Mcu Isolation" peripherals*/
	DECPROT(STM32MP1_ETZPC_DMA2_ID, DECPROT_MCU_ISOLATION, DECPROT_UNLOCK)
 
	/*Restriction: following IDs are not managed  - please to use User-Section if needed:
		STM32MP1_ETZPC_SRAMx_ID, STM32MP1_ETZPC_RETRAM_ID, STM32MP1_ETZPC_BKPSRAM_ID*/
 
	/* USER CODE BEGIN etzpc_decprot */
		/*STM32CubeMX generates a basic and standard configuration for ETZPC.
		Additional device configurations can be added here if needed.
		"etzpc" node could be also overloaded in "addons" User-Section.*/
	/* USER CODE END etzpc_decprot */
	>;
 
	secure-status = "okay";
 
	/* USER CODE BEGIN etzpc */
	/* USER CODE END etzpc */
};
 
&rcc{
	status = "okay";
	secure-status = "okay";
 
	/* USER CODE BEGIN rcc */
	/* USER CODE END rcc */
};
 
&rtc{
	status = "okay";
	secure-status = "okay";
 
	/* USER CODE BEGIN rtc */
	/* USER CODE END rtc */
};
 
&tamp{
	status = "okay";
	secure-status = "okay";
 
	/* USER CODE BEGIN tamp */
	/* USER CODE END tamp */
};
 
&uart4{
	pinctrl-names = "default";
	pinctrl-0 = <&uart4_pins_mx>;
	status = "okay";
 
	/* USER CODE BEGIN uart4 */
	/* USER CODE END uart4 */
};
 
&usbotg_hs{
	pinctrl-names = "default";
	pinctrl-0 = <&usb_otg_hs_pins_mx>;
	status = "okay";
 
	/* USER CODE BEGIN usbotg_hs */
	/* USER CODE END usbotg_hs */
};
 
&usbphyc{
	status = "okay";
 
	/* USER CODE BEGIN usbphyc */
	/* USER CODE END usbphyc */
};
 
&usbphyc_port0{
	status = "okay";
 
	/* USER CODE BEGIN usbphyc_port0 */
	/* USER CODE END usbphyc_port0 */
};
 
&usbphyc_port1{
	status = "okay";
 
	/* USER CODE BEGIN usbphyc_port1 */
	/* USER CODE END usbphyc_port1 */
};
 
/* USER CODE BEGIN addons */
/* USER CODE END addons */
 

[PatrickF]

Is your TF-A started from Flash or from USB/UART ?

Maybe something around HSE clock. You defined 'analog bypass', is it intended ?

Note that TF-A will initialize the DDR and load uBoot into it, I see some commented lines for DDR in your DT.

I recommend also to look at following pages:

https://community.st.com/s/article/FAQ-STM32MP1-Bring-up-procedure

https://community.st.com/s/article/FAQ-STM32MP1-bring-up-troubleshooting-guide

https://wiki.st.com/stm32mpu/wiki/Clock_device_tree_configuration_-_Bootloader_specific#DT_configuration_for_HSE

Regards.

[sylvain]

try to enable the hash...

in your dts, add:

&hash1{

    status = "okay";

};