STM32MP157 custom board, linux build tutorial

[jaehoon]

Is there a tutorial for newbie? I made my custom board by myself as hobby.

the board has switches to select boot 0 and boot 1, boot 2 is tied to ground through 10k resistor. so I could implement boot selector that switches between `00` flashing mode, `01` serial NOR, `10` NAND, `11` eMMC on SDMMC2. and I tested the MPU could run as DFU mode and I could see it in Cube Programmer tool.

but I can not get understood how can I flash linux to my board. 

exactly, I could build linux using yocto but, where should I put my DTS files that generated by Cube IDE?

I'm under WSL2 environment to build yocto. unfortunately, I'm not expert of linux kernel :(

[Olivier GALLIEN]

Hi @jaehoon ,

Doing such a project as hobby is really impressive! 

Main documentation point is our wiki : 

stm32mpu 

Seems you don't experiment with one ST evaluation board. It would really help. 

Be aware that Yocto build is not fully support on WSL2. We really recommand to use a Linux station. 

Before to flash it's mandatory to build binary suited to your hardware

You can consider these articles 

FAQ: STM32MP1 How to bring up STM32MP1 - STMicroelectronics Community

FAQ: STM32MPUs: How to create a device tree adapte... - STMicroelectronics Community 

How to compile the device tree with the Distribution Package - stm32mpu 

Hope it help 

Olivier 

[jaehoon]

Hello, I built FIP artifacts following wiki, `STM32MPU Developer Package`, 5.2. Installing the OpenSTLinux BSP packages.

And I could get binary files:

1. TF-A binary: tf-a-stm32mp157d-smp4-mx-optee-emmc.stm32
2. OPTEE binary: tee-*.bin files
3. u-boot binary: u-boot{,-nodtb,-dtb}.bin files

I did not build linux kernel yet. I want to check PMIC's 1.35v output in current step, because I've read somewhere in ST wiki that works when TF-A is flashed.

But Cube Programmer disconnected from the device before doing something.  <-- This was soldering problem. after resoldering, its fixed.

and even more, eMMC is not detected in cube programmer.

10:12:34 : UR connection mode is defined with the HWrst reset mode
10:12:35 : USB speed   : High Speed (480MBit/s)
10:12:35 : Manuf. ID   : STMicroelectronics
10:12:35 : Product ID  : DFU in HS Mode @Device ID /0x500, @Revision ID /0x0000
10:12:35 : SN          : 003B00413432510735313430
10:12:35 : DFU protocol: 1.1
10:12:35 : Board       : --
10:12:35 : Device ID   : 0x0500
10:12:36 : Warning: Connection to device 0x500 is lost
10:12:36 : Disconnected from device.
10:12:38 : UR connection mode is defined with the HWrst reset mode
10:12:39 : USB speed   : High Speed (480MBit/s)
10:12:39 : Manuf. ID   : STMicroelectronics
10:12:39 : Product ID  : DFU in HS Mode @Device ID /0x500, @Revision ID /0x0000
10:12:39 : SN          : 003B00413432510735313430
10:12:39 : DFU protocol: 1.1
10:12:39 : Board       : --
10:12:39 : Device ID   : 0x0500
10:12:43 : Disconnected from device.

I can not trace which step is wrong. I'll go home this evening and solder one more board to see if it's a soldering issue, but any help I can get in tracking down where the problem is coming.

Schematics:

---

eMMC recognition problem.

No partitions are related for eMMC. should I flash first partition and FSBL?

Or how can I check this problem?

@Olivier GALLIEN