TMDS64EVM: Linux not booting from eMMC after flashing bootloaders and rootfs

Sumi Mariam Mamachan

Part Number: TMDS64EVM

Hi Team,

I am working with an AM64x EVM and trying to boot Linux completely from eMMC (no SD card), following the Processor SDK documentation.

What works

Linux boots correctly from SD card
Kernel, DTB, and rootfs are present and verified on eMMC
SPL and U-Boot load successfully when boot mode is set to eMMC

What I did
1. Booted Linux from SD card
2. Flashed tiboot3.bin, tispl.bin, u-boot.img to eMMC boot0
3. Created ext4 partition on eMMC user area (mmcblk0p1)
4. Copied kernel, DTB, and full rootfs to eMMC
5. Set: mmc partconf 0 1 1 1
  mmc bootbus 0 2 0 0
  
  Problem
  
  When SD card is removed and boot mode is set to eMMC:
  - SPL and U-Boot start correctly
  - U-Boot keeps trying to boot from mmc1 (SD) and fails:
    
    MMC: no card present Couldn't find partition mmc 1:2
  - Linux never boots from eMMC
  - The complete boot logs is attaching here:
    
    So can you help me to get rid of this isssue.

Thank You,

Sumi Mariam Mamachan

6 months ago

0 Johnson John 6 months ago

TI__Intellectual 2760 points

Hi Sumi,

Could you run the following commands at U-Boot prompt -

=> setenv mmcdev 0
=> setenv bootpart 0
=> boot

Regards,
Johnson

0 Sumi Mariam Mamachan 6 months ago in reply to Johnson John

Prodigy 110 points

Hi Johnson,

Is it from the sdcard u-boot prompt or the eMMC U-boot prompt??

Regards,

Sumi

0 Johnson John 6 months ago in reply to Sumi Mariam Mamachan

TI__Intellectual 2760 points

Could be from either SD card or eMMC, but since you are trying to boot from eMMC, set the boot switches for eMMC boot.

When U-Boot starts, press any key to stop autoboot and get the U-Boot prompt. Then run:

=> setenv mmcdev 0
=> setenv bootpart 0
=> boot

0 Sumi Mariam Mamachan 6 months ago in reply to Johnson John

Prodigy 110 points

After performing the above commands, Linux now boots successfully.
Do I need to perform these steps manually every time, or is there a way to configure the system so that Linux boots automatically?

Regards,

Sumi

+1 Johnson John 6 months ago in reply to Sumi Mariam Mamachan

TI__Intellectual 2760 points

Hi Sumi,

Sumi Mariam Mamachan said:
After performing the above commands, Linux now boots successfully.

Thanks for the update.

Sumi Mariam Mamachan said:
Do I need to perform these steps manually every time, or is there a way to configure the system so that Linux boots automatically?

Yes, you can configure U-Boot to boot Linux automatically from the eMMC UDA by updating the boot variables in the am64x.env file and then rebuilding the boot binaries -

https://software-dl.ti.com/processor-sdk-linux/esd/AM64X/11_02_08_02/exports/docs/linux/How_to_Guides/Target/How_to_emmc_boot.html#emmc-boot-configuration

https://software-dl.ti.com/processor-sdk-linux/esd/AM64X/11_02_08_02/exports/docs/linux/Foundational_Components/U-Boot/BG-Build-K3.html#build-u-boot

Regards,
Johnson

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TMDS64EVM: Linux not booting from eMMC after flashing bootloaders and rootfs

What works

What I did