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AM625: Unable to reboot if using eMMC boot

Ethan Tian
Intellectual 1572 points
Part Number: AM625
Other Parts Discussed in Thread: SK-AM62

Hi experts

When the system boot from eMMC, the reboot command cannot finally start the system, and the reset cannot be performed under uboot (the same problem exists on SK-AM62). But the reboot command works if booting from SD card. Can you please confirm how the reboot command should be used on eMMC boot?

  • 0
    TI__Guru**** 155141 points

    Hi Ethan,

    What is the root filesystem used on eMMC? Is it from prebuilt rootfs provided in the Processor SDK? If so, which one?

  • 0 in reply to Bin Liu
    TI__Intellectual 1572 points

    Hi Bin

    The rootfs in eMMC uses the tisdk-default-image-am62xx-evm.tar.xz in the filesystem in the SDK8.6. The bitbake compiled by customer only has the wic file, and there is no packaged tar.xz. This part still needs to be consulted. how do we get tar.xz file out?

  • +1 in reply to Ethan Tian
    TI__Mastermind 28032 points

    By default the eMMC hardware reset signal RST_n is not enabled. Whether or not it should be permanently disabled or enabled can be configured one-time-only from within U-Boot:

    In Uboot: mmc rst-function 0 1

    OR:

    In Linux: mmc hwreset enable /dev/mmcblk0