Hi Andrey

+Philippe and Yannick who are the experts, please interacts directly with them.

Here is Philippe's answer:

The CONFIG_VIDEO_MIPI_DSI flag is not necessary as the panel is DPI, and so maybe this DSI configuration annoys the rest of the display chain...

Moreover, we are not using following flags so maybe it is better to try without first :-) *** Below was add by me *** #define CONFIG_SPLASH_SCREEN #define CONFIG_SPLASH_SCREEN_ALIGN #define CONFIG_VIDEO_LOGO #define CONFIG_VIDEO_BMP_LOGO

Use the STM default bmp file as a first test (bmp rle 8). Load it from the right sdcard partition to the same address space as on default STM delivery. Then display it using the same command as on default STM delivery.

Maybe double check your clock configuration (pixel clock), and be sure you are using the same pinctrl (a0 here) as your working kernel dt, the same panel reset gpio and panel enable gpio as in your kernel dt.

Do you have any uboot error message (you may need to enable uboot debug mode)? You may try to add traces in the drivers/video/stm32_ltdc.c file, especially in the stm32_ltdc_probe() function...

Patrice

On 6/25/21 12:14 PM, Andrey Nechypurenko wrote:

Hi Folks,

I am trying to display a splash image from u-boot on the Phytec's phyBOARD Sargas STM32MP157 evaluation board. https://www.phytec.de/en/produkte/single-board-computer/phyboard-sargas-stm3... https://www.phytec.de/en/cdocuments/?doc=d4PmEQ

I feel like I tried everything possible including throwing runes and bones :-) but to no avail. So maybe someone here could help. Here are more details and description of what I was trying.

I am using the same u-boot (version and set of patches) as provided by Yocto BSP (I am building with Buildroot but it is probably not relevant) STM32MP> version U-Boot 2020.01-stm32mp-r2.1 (Jun 24 2021 - 13:30:02 +0200) arm-none-linux-gnueabihf-gcc (GNU Toolchain for the A-profile Architecture 10.2-2020.11 (arm-10.16)) 10.2.1 20201103 GNU ld (GNU Toolchain for the A-profile Architecture 10.2-2020.11 (arm-10.16)) 2.35.1.20201028

Display is DPI (i.e parallel RGB interface): https://www.phytec.eu/fileadmin/user_upload/images/content/1.Products/SBCs/p...

I managed to display a splash screen from Kernel and in general, the display works fine from user space. So I am sure that everything is connected properly and the hardware works. Also, u-boot is using the same DTS files as Kernel. So I assume that everything is properly configured there. Following is the relevant part of the output from modetest:

# modetest trying to open device 'stm'...done Encoders: id crtc type possible crtcs possible clones 31 35 DPI 0x00000001 0x00000000

Connectors: id encoder status name size (mm) modes encoders 32 31 connected DPI-1 152x91 1 31 modes: index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot #0 800x480 59.99 800 840 968 1056 480 490 492 525 33260 flags: nhsync, nvsync; type: preferred, driver

In the u-boot menuconfig I enabled all the relevant options I could find. At least the bmp command is available. Here is the Graphics part of the .config (I can post .config if necessary):

# Graphics support CONFIG_DM_VIDEO=y CONFIG_BACKLIGHT_GPIO=y CONFIG_VIDEO_BPP8=y CONFIG_VIDEO_BPP16=y CONFIG_VIDEO_BPP32=y # CONFIG_VIDEO_ANSI is not set CONFIG_VIDEO_MIPI_DSI=y CONFIG_CONSOLE_NORMAL=y # CONFIG_CONSOLE_ROTATION is not set # CONFIG_CONSOLE_TRUETYPE is not set CONFIG_SYS_WHITE_ON_BLACK=y # CONFIG_NO_FB_CLEAR is not set

In addition, the following defines were added to include/configs/stm32mp1.h:

#ifdef CONFIG_DM_VIDEO #define CONFIG_VIDEO_BMP_RLE8 #define CONFIG_BMP_16BPP #define CONFIG_BMP_24BPP #define CONFIG_BMP_32BPP *** Below was add by me *** #define CONFIG_SPLASH_SCREEN #define CONFIG_SPLASH_SCREEN_ALIGN #define CONFIG_VIDEO_LOGO #define CONFIG_VIDEO_BMP_LOGO #endif

For the sake of completion, here is the output of the dm tree command:

STM32MP> dm tree Class Index Probed Driver Name

---

root 0 [ + ] root_driver root_driver mailbox 0 [ + ] arm_smc_mbox |-- mailbox-0 mailbox 1 [ ] arm_smc_mbox |-- mailbox-1 firmware 0 [ ] psci |-- psci sysreset 0 [ ] psci-sysreset | `-- psci-sysreset simple_bus 0 [ + ] generic_simple_bus |-- soc serial 0 [ ] serial_stm32 | |-- serial@4000f000 serial 1 [ + ] serial_stm32 | |-- serial@40010000 i2c 0 [ ] stm32f7-i2c | |-- i2c@40012000 spi 0 [ ] stm32_spi | |-- spi@44004000 usb 0 [ ] dwc2-udc-otg | |-- usb-otg@49000000 hwspinlock 0 [ + ] hwspinlock_stm32mp1 | |-- hwspinlock@4c000000 mailbox 2 [ ] stm32_ipcc | |-- mailbox@4c001000 nop 0 [ + ] stm32-rcc | |-- rcc@50000000 clk 0 [ + ] stm32mp1_clk | | |-- stm32mp1_clk reset 0 [ + ] stm32_rcc_reset | | `-- stm32_rcc_reset pmic 0 [ + ] stm32mp_pwr_pmic | |-- pwr@50001000 regulator 0 [ + ] stm32mp_pwr_regulato | | |-- reg11 regulator 1 [ + ] stm32mp_pwr_regulato | | |-- reg18 regulator 2 [ + ] stm32mp_pwr_regulato | | `-- usb33 syscon 0 [ ] syscon | |-- pwr_mcu@50001014 syscon 1 [ ] syscon | |-- interrupt-controller@5000d000 syscon 2 [ + ] stmp32mp_syscon | |-- syscon@50020000 spi 1 [ ] stm32_qspi | |-- spi@58003000 spi_flash 0 [ ] spi_flash_std | | `-- w25q128@0 mmc 0 [ + ] stm32_sdmmc2 | |-- sdmmc@58005000 blk 0 [ + ] mmc_blk | | `-- sdmmc@58005000.blk mmc 1 [ + ] stm32_sdmmc2 | |-- sdmmc@58007000 blk 1 [ ] mmc_blk | | `-- sdmmc@58007000.blk eth 0 [ + ] eth_eqos | |-- ethernet@5800a000 usb 0 [ ] ehci_generic | |-- usbh-ehci@5800d000 video 0 [ ] stm32_display | |-- display-controller@5a001000 watchdog 0 [ + ] stm32mp-wdt | |-- watchdog@5a002000 phy 0 [ ] stm32-usbphyc | |-- usbphyc@5a006000 serial 2 [ ] serial_stm32 | |-- serial@5c000000 i2c 1 [ + ] stm32f7-i2c | |-- i2c@5c002000 pmic 1 [ + ] stpmic1_pmic | | `-- stpmic@33 regulator 3 [ + ] stpmic1_buck | | |-- buck1 regulator 4 [ + ] stpmic1_buck | | |-- buck2 regulator 5 [ + ] stpmic1_buck | | |-- buck3 regulator 6 [ + ] stpmic1_buck | | |-- buck4 regulator 7 [ + ] stpmic1_ldo | | |-- ldo1 regulator 8 [ + ] stpmic1_ldo | | |-- ldo2 regulator 9 [ + ] stpmic1_ldo | | |-- ldo3 regulator 10 [ + ] stpmic1_ldo | | |-- ldo4 regulator 11 [ + ] stpmic1_ldo | | |-- ldo5 regulator 12 [ + ] stpmic1_ldo | | |-- ldo6 regulator 13 [ + ] stpmic1_vref_ddr | | |-- vref_ddr regulator 14 [ + ] stpmic1_boost | | |-- boost regulator 15 [ + ] stpmic1_pwr_sw | | |-- pwr_sw1 regulator 16 [ + ] stpmic1_pwr_sw | | |-- pwr_sw2 misc 0 [ ] stpmic1-nvm | | |-- stpmic1-nvm sysreset 1 [ ] stpmic1-sysreset | | `-- stpmic1-sysreset rtc 0 [ ] rtc-stm32 | |-- rtc@5c004000 misc 1 [ + ] stm32mp_bsec | |-- nvmem@5c005000 simple_bus 1 [ ] generic_simple_bus | |-- tamp@5c00a000 pinctrl 0 [ + ] pinctrl_stm32 | |-- pin-controller@50002000 gpio 0 [ + ] gpio_stm32 | | |-- gpio@50002000 gpio 1 [ + ] gpio_stm32 | | |-- gpio@50003000 gpio 2 [ + ] gpio_stm32 | | |-- gpio@50004000 gpio 3 [ + ] gpio_stm32 | | |-- gpio@50005000 gpio 4 [ + ] gpio_stm32 | | |-- gpio@50006000 gpio 5 [ + ] gpio_stm32 | | |-- gpio@50007000 gpio 6 [ + ] gpio_stm32 | | |-- gpio@50008000 gpio 7 [ + ] gpio_stm32 | | |-- gpio@50009000 gpio 8 [ + ] gpio_stm32 | | |-- gpio@5000a000 gpio 9 [ ] gpio_stm32 | | |-- gpio@5000b000 gpio 10 [ ] gpio_stm32 | | |-- gpio@5000c000 pinconfig 0 [ + ] pinconfig | | |-- rgmii-0 pinconfig 1 [ ] pinconfig | | |-- rgmii-sleep-0 pinconfig 2 [ ] pinconfig | | |-- fmc-0 pinconfig 3 [ ] pinconfig | | |-- fmc-sleep-0 pinconfig 4 [ ] pinconfig | | |-- qspi-bk1-0 pinconfig 5 [ ] pinconfig | | |-- qspi-bk1-sleep-0 pinconfig 6 [ ] pinconfig | | |-- qspi-clk-0 pinconfig 7 [ ] pinconfig | | |-- qspi-clk-sleep-0 pinconfig 8 [ + ] pinconfig | | |-- sdmmc2-b4-0 pinconfig 9 [ ] pinconfig | | |-- sdmmc2-b4-od-0 pinconfig 10 [ ] pinconfig | | |-- sdmmc2-b4-sleep-0 pinconfig 11 [ ] pinconfig | | |-- sdmmc2-b4-1 pinconfig 12 [ ] pinconfig | | |-- sdmmc2-b4-od-1 pinconfig 13 [ + ] pinconfig | | |-- sdmmc2-d47-0 pinconfig 14 [ ] pinconfig | | |-- sdmmc2-d47-sleep-0 pinconfig 15 [ ] pinconfig | | |-- dac-ch1 pinconfig 16 [ ] pinconfig | | |-- dac-ch2 pinconfig 17 [ ] pinconfig | | |-- dcmi-0 pinconfig 18 [ ] pinconfig | | |-- dcmi-sleep-0 pinconfig 19 [ ] pinconfig | | |-- i2c1-0 pinconfig 20 [ ] pinconfig | | |-- i2c1-1 pinconfig 21 [ + ] pinconfig | | |-- ltdc-a-0 pinconfig 22 [ ] pinconfig | | |-- ltdc-a-1 pinconfig 23 [ ] pinconfig | | |-- m-can1-0 pinconfig 24 [ ] pinconfig | | |-- m_can2-sleep@0 pinconfig 25 [ ] pinconfig | | |-- pwm5-0 pinconfig 26 [ ] pinconfig | | |-- pwm5-sleep-0 pinconfig 27 [ ] pinconfig | | |-- sai2a-2 pinconfig 28 [ ] pinconfig | | |-- sai2a-3 pinconfig 29 [ ] pinconfig | | |-- sai2b-0 pinconfig 30 [ ] pinconfig | | |-- sai2b-1 pinconfig 31 [ ] pinconfig | | |-- sai2b-2 pinconfig 32 [ ] pinconfig | | |-- sai2b-3 pinconfig 33 [ + ] pinconfig | | |-- sdmmc1-b4-0 pinconfig 34 [ ] pinconfig | | |-- sdmmc1-b4-od-0 pinconfig 35 [ ] pinconfig | | |-- sdmmc1-b4-sleep-0 pinconfig 36 [ ] pinconfig | | |-- sdmmc3-b4-0 pinconfig 37 [ ] pinconfig | | |-- sdmmc3-b4-od-0 pinconfig 38 [ ] pinconfig | | |-- sdmmc3-b4-sleep-0 pinconfig 39 [ + ] pinconfig | | |-- uart4-0 pinconfig 40 [ ] pinconfig | | |-- uart4-idle-0 pinconfig 41 [ ] pinconfig | | |-- uart4-sleep-0 pinconfig 42 [ ] pinconfig | | |-- usart1-1 pinconfig 43 [ ] pinconfig | | |-- usart1-idle-1 pinconfig 44 [ ] pinconfig | | |-- usart1-sleep-1 pinconfig 45 [ ] pinconfig | | |-- usart3-0 pinconfig 46 [ ] pinconfig | | |-- usart3-idle-0 pinconfig 47 [ ] pinconfig | | |-- usart3-sleep-0 pinconfig 48 [ ] pinconfig | | |-- usart3-1 pinconfig 49 [ ] pinconfig | | |-- usart3-idle-1 pinconfig 50 [ ] pinconfig | | |-- usart3-sleep-1 pinconfig 51 [ ] pinconfig | | `-- usbotg_hs-0 pinctrl 1 [ + ] pinctrl_stm32 | |-- pin-controller-z@54004000 gpio 11 [ + ] gpio_stm32 | | |-- gpio@54004000 pinconfig 52 [ + ] pinconfig | | |-- i2c4-0 pinconfig 53 [ ] pinconfig | | |-- i2c4-1 pinconfig 54 [ ] pinconfig | | |-- usart1-0 pinconfig 55 [ ] pinconfig | | |-- usart1-idle-0 pinconfig 56 [ ] pinconfig | | |-- usart1-sleep-0 pinconfig 57 [ ] pinconfig | | |-- spi1-0 pinconfig 58 [ ] pinconfig | | `-- spi1-sleep-0 ram 0 [ ] stm32mp1_ddr | `-- ddr@5a003000 simple_bus 2 [ ] generic_simple_bus |-- mlahb remoteproc 0 [ ] stm32_m4_proc | `-- m4@10000000 regulator 17 [ + ] fixed regulator |-- vin regulator 18 [ + ] fixed regulator |-- regulator-mcan nop 1 [ + ] scmi-agent `-- scmi-0 clk 1 [ + ] scmi_clk |-- protocol@14 reset 1 [ + ] scmi_reset_domain `-- protocol@16

Despite all these attempts, there is no output from u-boot on the screen. Also, attempting to load splash image manually (using ext4load) and display them with bmp display does not lead to anything shown on display but also does not show any error messages.

Now I am out of ideas of what else could be done or how to find the reason for the problem. So I would really appreciate any suggestions from fellow u-booters :-)

Thank you, Andrey.