Issue booting with eMMC on STM32MP157F-Eval board

[Pratik Manvar]

Hello STM-Team,

I am working with STM32MP157F-Eval board. The SD card and NAND booting are working fine. But, getting issues while booting with eMMC.

I have tried a workaround which seems to be working and I want to make sure if it is the right way of doing.

Please see below error. 

------------------------------------------------------------------------

Boot over mmc1!

Saving Environment to MMC... Writing to redundant MMC(1)... OK

switch to partitions #0, OK

mmc1(part 0) is current device

Scanning mmc 1:5...

Found U-Boot script /boot.scr.uimg

2943 bytes read in 29 ms (98.6 KiB/s)

## Executing script at c4100000

Executing SCRIPT on target=mmc1

Saving Environment to MMC... Writing to MMC(1)... OK

switch to partitions #0, OK

mmc1(part 0) is current device

Scanning mmc 1:5...

77087 bytes read in 30 ms (2.4 MiB/s)

SCRIPT FAILED... /mmc1_extlinux/extlinux.conf not found !

Saving Environment to MMC... Writing to redundant MMC(1)... OK

SCRIPT FAILED: continuing...

77087 bytes read in 31 ms (2.4 MiB/s)

STM32MP>

STM32MP> ls mmc 1:5 /

<DIR>    1024 .

<DIR>    1024 ..

<DIR>   12288 lost+found

      2943 boot.scr.uimg

<DIR>    1024 mmc0_extlinux

<DIR>    1024 nand0_extlinux

      18244 splash.bmp

      77374 stm32mp157f-ev1-a7-examples.dtb

      77607 stm32mp157f-ev1-m4-examples.dtb

      77087 stm32mp157f-ev1.dtb

     7309840 uImage

     3632420 uInitrd

STM32MP> ls mmc 1:5 /mmc0_extlinux/

<DIR>    1024 .

<DIR>    1024 ..

       256 extlinux.conf

       706 stm32mp157f-ev1_extlinux.conf

STM32MP>

------------------------------------------------------------------------

I am suspecting 2 probable issues while booting with eMMC on STM32MP157F-Eval board.

1. Below u-boot environments are wrong.

---------------------------------------------

boot_syslinux_conf=extlinux/extlinux.conf

boot_prefixes=/ /boot/

boot_targets=mmc1 ubifs0 mmc0 mmc2 pxe

---------------------------------------------

So, I have updated and saved the environments as below.

---------------------------------------------

STM32MP> setenv boot_syslinux_conf 'extlinux\/stm32mp157f-ev1_extlinux.conf'

STM32MP> setenv boot_prefixes '/mmc0_' // As 'stm32mp157f-ev1_extlinux.conf' stored in 'mmc0_extlinux' directory.

STM32MP> setenv boot_targets mmc1

STM32MP> saveenv

---------------------------------------------

2. It always append bootargs (root=PARTUUID) of mmc0 (sdcard) instead of mmc1.

---------------------------------------------

append: root=PARTUUID=e91c4e10-16e6-4c0e-bd0e-77becf4a3582 rootwait rw console=ttySTM0,115200

---------------------------------------------

So, I have commented the 'set_env' function in bootloader source and changed bootargs at runtime as below as per  "https://wiki.st.com/stm32mpu/wiki/STM32CubeProgrammer_flashlayout#GPT_partuuid_of_rootfs_partition". 

---------------------------------------------

STM32MP> setenv bootargs 'root=PARTUUID=491f6117-415d-4f53-88c9-6e0de54deac6 rootwait rw console=ttySTM0,115200'

---------------------------------------------

After doing above two stuff, board is booting fine with eMMC.

I am wondering why the build is configured to refer to mmc0 (SDcard) instead of mmc1 (eMMC)?

Thank You.

Regards,

Pratik Manvar

[Olivier GALLIEN]

Hi @Pratik Manvar​ ,

Can you please detail how did you build this faulty image ?

Distribution or Development package ?

Thanks

Olivier

[Pratik Manvar]

Hi @Community member,

Thanks for the reply.

I am using the distribution package (openstlinux-5.4-dunfell-mp1-20-06-24) and building for evaluation board "MACHINE=stm32mp1-eval".

I have some updates. With clean build (removed old build directory), I don't see above issues.

The default boot device was BOOTDEVICE_LABELS += "sdcard" in "machine/stm32mp1-eval.conf" file. Which worked fine.

Then I had enable below config to test NAND flash boot-up. Which worked fine.

BOOTDEVICE_LABELS += "nand-4-256"

After that, I had enable below config to test eMMC flash boot-up. In which I came across above issues.

BOOTDEVICE_LABELS += "emmc"

To generate above build images (NAND & eMMC), I had run below commands without deleting build directory (build-openstlinuxweston-stm32mp1-eval).

$ DISTRO=openstlinux-weston MACHINE=stm32mp1-eval source layers/meta-st/scripts/envsetup.sh

$ bitbake st-image-weston -c cleansstate

$ bitbake st-image-weston

With this, NAND boot worked and eMMC boot didn't work.

But, after deleting build directory (build-openstlinuxweston-stm32mp1-eval) and with fresh build, I don't see such issues booting with eMMC. Everything works fine.

Thanks & Regards,

Pratik Manvar