About Rc.1

Rc.1 · 2023-04-30

I'm using a custom stm32mp157a board with a DSI display.If I enable uart8 using pins J8 (UART8_TX) and J9 (UART8_RX) the display driver (panel-sitronix-st7701.c) doesnt load properly and the display stays blank. uart8 does work properly. If I disab...

Rc.1 · 2022-11-17

Imagine you are a newbie trying to understand the device tree and clock configuration.Which of these pages is more useful?https://wiki.st.com/stm32mpu/wiki/Clock_device_tree_configurationorhttps://wiki.stmicroelectronics.cn/stm32mpu/index.php?title=C...

Rc.1 · 2022-04-13

I just spent a day trying to configure a gpio with internal pullup using gpiolib. Could not get it configured. Then spent 2 days with device drivers and device trees, and got it working. Seems insane to me that configuring gpios should be this comple...

Rc.1 · 2021-10-15

Rc.1 · 2021-08-17

Rc.1 · 2022-04-14

# gpioinfo gpiochip3 gpiochip3 - 16 lines: ... line 5: unnamed kernel input active-high [used] line 6: unnamed unused input active-high line 7: unnamed kernel input active-high [used] line 8: unnamed kernel input active-...

Rc.1 · 2022-04-13

Thanks Patrick!I am in the process of trying this - if it works then it IS possible from userspace using the gpiod library and https://wiki.st.com/stm32mpu/wiki/How_to_control_a_GPIO_in_userspace is incorrect.UPDATE:I installed python3 and pip and gp...

Rc.1 · 2021-10-28

Thanks Kevin, your post explains why the system still boots with only 1 FSBL.

Rc.1 · 2021-10-15

I filled the second fsbl partition with all zeroes, u-boot still runs.

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MIPI display blank after enabling uart8

Why is the latest st wiki Clock device tree configuration so terrible?

On a linux stm32mp157 system can gpio with pullup or pull-down resistors be configured in user space ? If yes how?

According to https://u-boot.readthedocs.io/en/stable/board/st/stm32mp1.html , the SD card requires 2 copies of the fsbl. Why are 2 copies required?

The STM32MP157 has a maximum of 2 DSI data lanes. Is it feasible to run a 1280x800 display with only 2 lanes?

Re: On a linux stm32mp157 system can gpio with pullup or pull-down resistors be configured in user space ? If yes how?

Re: On a linux stm32mp157 system can gpio with pullup or pull-down resistors be configured in user space ? If yes how?

Re: According to https://u-boot.readthedocs.io/en/stable/board/st/stm32mp1.html , the SD card requires 2 copies of the fsbl. Why are 2 copies required?

Re: According to https://u-boot.readthedocs.io/en/stable/board/st/stm32mp1.html , the SD card requires 2 copies of the fsbl. Why are 2 copies required?