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AM62P: Boot time reduction for Yocto Linux running om AM62P5

Aditya Tandulwadkar
Intellectual 720 points

Part Number: AM62P

Hello Ti experts,image.pngThis is current state of my booting procedure with different setups mentioned in image above. As per the above image I've 2 questions and they are:

1. While booting Falcon mode boot in eMMC and the SD Card, the time required to boot using eMMC should be technically less than time required to boot from SD Card, Correct is I'm wrong. But, in my case why is time required for booting the same in both SD Card as well as eMMC in Falcon mode?
2. When used InitRAMfs in Falcon boot, the boot-time is increased, why is this happening?

Regards,
Aditya T

  • 0
    TI__Guru**** 181776 points

    Hi Aditya,

    I am routing your query to another team member for comments.

  • 0 in reply to Bin Liu
    TI__Expert 6650 points

    Hi Aditya,

    1. SD vs eMMC

    In falcon mode, the big optimization come from skipping A53 SPL and U-boot proper and jumping to TF-A and then the kernel.

    Storage time is only the time to read Linux appimage from MMC.

    Even if you compare the HS400 vs SD read time for ~20 MB (Linux appimage), the savings will be in the order couple hundred milliseconds only.

    Refer: software-dl.ti.com/.../DATASHEET_AM62PX_EVM.html

    2. Use of initramfs

    A full initramfs may increase the amount of data which needs to be read from MMC and then decompressed early in boot. 
    So the extra read and decompression may increase the boot-time unless it's a tiny initramfs.

    If more clarifications are needed, can you share the full kernel logs along with the image sizes for these cases?

    Regards,
    Vinu

  • 0 in reply to Vinuchandran A V
    Intellectual 720 points

    Hello,

    Vinuchandran A V said:

    1. SD vs eMMC

    In falcon mode, the big optimization come from skipping A53 SPL and U-boot proper and jumping to TF-A and then the kernel.

    Storage time is only the time to read Linux appimage from MMC.

    Even if you compare the HS400 vs SD read time for ~20 MB (Linux appimage), the savings will be in the order couple hundred milliseconds only.

    Refer: software-dl.ti.com/.../DATASHEET_AM62PX_EVM.html

    This is fine now, I understood it.

    Vinuchandran A V said:

    2. Use of initramfs

    A full initramfs may increase the amount of data which needs to be read from MMC and then decompressed early in boot. 
    So the extra read and decompression may increase the boot-time unless it's a tiny initramfs.

    If more clarifications are needed, can you share the full kernel logs along with the image sizes for these cases?

    For this I've attached the console logs, also I'm not able to login when used initramfs

    U-Boot SPL 2025.01-00766-g7493977a537f (Dec 03 2025 - 15:20:36 +0000)
SYSFW ABI: 4.0 (firmware rev 0x000b '11.2.5--v11.02.05 (Fancy Rat)')
Set clock rates for '/a53@0', CPU: 1250MHz at Speed Grade 'U'
SPL initial stack usage: 17104 bytes
Trying to boot from MMC2
Authentication passed
Loading falcon payload from MMC2
Authentication passed
Authentication passed
Loading Environment from nowhere... OK
Authentication passed
Authentication passed
Starting ATF on ARM64 core...

NOTICE:  BL31: v2.13.0(release):v2.13.0-259-ge0c4d3903b-dirty
NOTICE:  BL31: Built : 07:01:36, Jul  1 2025

am62xx-evm login: root
login
am62xx-evm login: root
login
am62xx-evm login:

    Regards,
    Aditya T

  • +1 in reply to Aditya Tandulwadkar
    TI__Expert 6650 points

    Hi Aditya,

    Aditya Tandulwadkar said:
    When used InitRAMfs in Falcon boot, the boot-time is increased, why is this happening?

    Were you able to boot properly earlier with intramfs and falconboot?

    Aditya Tandulwadkar said:
    I'm not able to login when used initramfs

    And are you unable to boot now?

    Regards,
    Vinu

  • +1 in reply to Vinuchandran A V
    Intellectual 720 points

    Hello,
    By mistake I clicked on Resolved, but still I've not resolved.

    First of all sorry for delay, but I was busy with some other topics that's why I couldn't reply here.

    I want to mention one things that is the file /sbin/init which is present here does not works. I need to modify it to below
    /////////////////////////////////////////////////////////

    #!/bin/sh

    mount -t proc none /proc
    mount -t sysfs none /sys

    sleep 5

    mount -t devtmpfs  dev  /dev

    ls /dev/ >> /tmp/log 2>&1
    echo "ls dev" $? >> /dev/ttyS2

    ls /dev/mmcblk1p2 >> /tmp/log 2>&1

    mount /dev/mmcblk1p2 /mnt/
    echo "Mount FS:" $? >> /dev/ttyS2

    umount /proc
    umount /sys

    exec switch_root /mnt/ /sbin/init

    /////////////////////////////////////////////////////////


    And after modifying it to above mentioned content. The Linux boots from falcon mode using initramfs but the boot time is increased to 13secs which was 8 seconds with the same falcon mode but without using initramfs

    Can you guide me with this?

    Regards,
    Aditya T

  • 0 in reply to Aditya Tandulwadkar
    TI__Expert 6650 points

    Hi Aditya,

    Inorder to maintain searchability among community users, please create a new thread for the above issue.

    Also, while creating the thread, please mention all details, required to replicate the issue.

    Regards,
    Vinu