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fctu
Visitor II
April 29, 2020
Solved

Cannot boot up custom board which based on STM32MP157C-DK2 , only get message from UART ..."PANIC at PC : 0x2ffdc323 , Exception mode=0x00000016 at: 0x2ffda000"

  • April 29, 2020
  • 2 replies
  • 2702 views

Hello,

We made a board that based on STM32MP157C-DK2.

First of all, show the configuration of our board as below....

(1). The major parts and circuit are same as DK2 such as DDR, PMIC, MicroSD, Ethernet.

(2). Some parts are removed such as MCU, WIFI/BT, HDMI Tx, USB hub, USB Type-C DRP and LCD module.

(3). And add some peripheral such as eMMC, two SPI devices (SPI4, SPI5), EEP (I2C-1)

The problem is: The board cannot boot up from SD card, list the symptoms as below...

(1). We tried to boot up the board by DK2 SD card (it works well on DK2), but got the exception message from UART ...

PANIC at PC : 0x2ffdc323

       Exception mode=0x00000016 at: 0x2ffda000

This is all messages since power on.

(2). The BOOT cfg. bit setting is confirmed on 101b, boot from SD card.

(3). The PA13 (boot status pin) kept Hi or Hi-Z.

(4). PMIC RANK-0 no power output, but other RANK had output power.

(5). About SD card access....

     a. Only SDMMC1_CK, SDMMC1_CMD and SDMMC1_D0 are works a few moment after power on.

  b. SDMMC1_D1~D2 did not work.

  c. I guess it works on 1-bit mode and then crashed.

  

   We guess it crashes on very early booting stage even still in ROM code.

Please advise you comments.

Many thanks.

FC.

    This topic has been closed for replies.
    Best answer by Olivier GALLIEN

    For narrowing down further the issue, a so early error is typical from an HSE configuration issue.

    Please refer to chapter 3.2.1.2 DT configuration for HSE in https://wiki.st.com/stm32mpu/wiki/Clock_device_tree_configuration_-_Bootloader_specific

    Olivier

    2 replies

    O
    Olivier GALLIEN
    Technical Moderator
    April 29, 2020

    Hi @fctu​ 

    This trace come from TF-A.

    Even if your hardware looks to be very close, seems something prevent to use exact same TF-A of the DK2.

    If not already done please cross check your TF-A device tree with help of these guideline :

    https://wiki.st.com/stm32mpu/wiki/How_to_create_your_board_device_tree

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

    Olivier

    O
    Olivier GALLIENAnswer
    Technical Moderator
    April 29, 2020

    For narrowing down further the issue, a so early error is typical from an HSE configuration issue.

    Please refer to chapter 3.2.1.2 DT configuration for HSE in https://wiki.st.com/stm32mpu/wiki/Clock_device_tree_configuration_-_Bootloader_specific

    Olivier

    F
    fctuAuthor
    Visitor II
    May 1, 2020

    Hi OlivierG,

    Thank you for your quick reply.

    It is true that your magical suggestion is correct and has given us great help.

    The external clock of our board is a crystal, and DK2 is an oscillator. After setting the TF-A DT clock correctly, our board can boot BL2 until U-Boot.

    thank you for your help!

    FC

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