STdistro mickledore - u-boot-stm32mp fails - Device Tree Source not correctly specified

[luaiza]

Hello,

I am facing the issue below when build up my image (or u-boot-stm32mp alone)
I mainly followed instructions in https://wiki.st.com/stm32mpu/wiki/How_to_compile_the_device_tree_with_the_Distribution_Package.
But it did not work.

make -f /home/luisa/dev/st/st_distro/stdistro/build-try-test1/tmp-glibc/work-shared/stm32mp151a-bitron-som/uboot-source/scripts/Makefile.build obj=arch/arm/dts dtbs
test -e arch/arm/dts/stm32mp151a-bitron-som-mx.dtb || ( \
echo >&2; \
echo >&2 "Device Tree Source (arch/arm/dts/stm32mp151a-bitron-som-mx.dtb) is not correctly specified."; \
echo >&2 "Please define 'CONFIG_DEFAULT_DEVICE_TREE'"; \
echo >&2 "or build with 'DEVICE_TREE=<device_tree>' argument"; \
echo >&2; \
/bin/false)

My .dts file

stm32mp151a-bitron-som-mx.dts 
stm32mp151a-bitron-som-mx-u-boot.dtsi

are below my building path <builddir>/tmp-glibc/work-shared/stm32mp151a-bitron-som/uboot-source/arch/arm/dts and are as the ones below my mx/bitron_som_20634519_06/CA7/DeviceTree/bitron-som/u-boot directory. I noticed that folder arch/arm/dts holds only .dts and .dtsi files but no .dtb - so why it is expecting a dtb there?

In general, when using OpenSTLinux distribution, is Yocto sufficient to build dtb files?
When one needs to take steps listed in https://wiki.st.com/stm32mpu/wiki/How_to_configure_U-Boot_for_your_board ?

Attached my conf/machine/<machine>.conf file (extended extension to .txt for uploading)

This issue is just the same as 583813  and 53885  but I have found no answer there - so I would thank you for any help.

[luaiza · Accepted solution]

I solved my issue, by #including missing .dtsi in my u-boot/xxx.dts and u-boot/xxx.dtsi files.  They way they are generated by the CubeMx is not sufficient. 
Beyond the above error,

When bitbaking u-boot-stm32mp individually, I got the following error related to scmi_clsk

---

/ahb/m4@10000000/m4_system_resources/can@4400e000: Reference to non-existent node or label "scmi_clk"​

---

I resolved that by #including stm32mp15-scmi.dtsi 

In general, I used stm32mp157c-ev1.dts and stm32mp157c-ev1-u-boot.dtsi (from u-boot repository) as guideline.  Providing to my files same #include directives present there, just searching for those matching my board stm32m151a.

In addition, to fix the errors below

| arch/arm/dts/stm32mp151a-ac_wmini_eu_mp151a-mx.dtb: ERROR (phandle_references): /soc/rcc@50000000: Reference to non-existent node or label "clk_hse"
| arch/arm/dts/stm32mp151a-ac_wmini_eu_mp151a-mx.dtb: ERROR (phandle_references): /soc/rcc@50000000: Reference to non-existent node or label "clk_hsi"
| arch/arm/dts/stm32mp151a-ac_wmini_eu_mp151a-mx.dtb: ERROR (phandle_references): /soc/rcc@50000000: Reference to non-existent node or label "clk_csi"
| arch/arm/dts/stm32mp151a-ac_wmini_eu_mp151a-mx.dtb: ERROR (phandle_references): /soc/rcc@50000000: Reference to non-existent node or label "clk_lse"
| arch/arm/dts/stm32mp151a-ac_wmini_eu_mp151a-mx.dtb: ERROR (phandle_references): /soc/rcc@50000000: Reference to non-existent node or label "clk_lsi"

 I re-declared  clocks clk_hse, clk_hsi, clk_csi,... within the clocks node of my .dts file, which was empty

	clocks{
		/* USER CODE BEGIN clocks */
		clk_csi: clk-csi {
		#clock-cells = <0>;
		compatible = "fixed-clock";
		clock-frequency = <4000000>;
		};

		clk_hse: clk-hse {
		#clock-cells = <0>;
		compatible = "fixed-clock";
		clock-frequency = <24000000>;
		};

		clk_hsi: clk-hsi {
		#clock-cells = <0>;
		compatible = "fixed-clock";
		clock-frequency = <64000000>;
		};

		clk_lse: clk-lse {
		#clock-cells = <0>;
		compatible = "fixed-clock";
		clock-frequency = <32768>;
		};

		clk_lsi: clk-lsi {
		#clock-cells = <0>;
		compatible = "fixed-clock";
		clock-frequency = <32000>;
		};			
		/* USER CODE END clocks */	
	};

NOTICE:  those clocks are declared in stm32mp151.dti , which is also  #included in my .dts, but the fact that the clock node was initially empty in my .dts file, make me think that the result was not clocks declared at all.

[debugging]

We walked into the same problems and solutions around the same time. :beaming_face_with_smiling_eyes:

[DMårt]

I got the exact BUG as you do. @luaiza 

I solved this by adding this into the .dts file

/* USER CODE BEGIN includes */
#include "stm32mp15-scmi.dtsi"
#include "stm32mp15-scmi-u-boot.dtsi"
/* USER CODE END includes */

  And of course the clocks. It seems that STM32CudeIDE won't generate these clocks. Perhaps this thread should be reported to the ST-developers so they can take a look at it.

clocks{

		/* USER CODE BEGIN clocks */
		clk_csi: clk-csi {
				#clock-cells = <0>;
				compatible = "fixed-clock";
				clock-frequency = <4000000>;
		};

		clk_hse: clk-hse {
				#clock-cells = <0>;
				compatible = "fixed-clock";
				clock-frequency = <24000000>;
		};

		clk_hsi: clk-hsi {
				#clock-cells = <0>;
				compatible = "fixed-clock";
				clock-frequency = <64000000>;
		};

		clk_lse: clk-lse {
				#clock-cells = <0>;
				compatible = "fixed-clock";
				clock-frequency = <32768>;
		};

		clk_lsi: clk-lsi {
				#clock-cells = <0>;
				compatible = "fixed-clock";
				clock-frequency = <32000>;
		};			
		/* USER CODE END clocks */
	};

}; /*root*/

[UVV]

You should define a dtsi similar to arch/arm/dts/stm32mp157c-ed1-scmi.dts, which redefines the clocks for your devices.

[DMårt]

@UVV  Hi. I solved this issue and have build my stm32mp151 board. It's working great!