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Original question:

AM62A7: How to quickly perform eMMC programming?

AM62A7: Can not boot from emmc

kangbai li
Prodigy 50 points
Part Number: AM62A7

Tool/software:

Dear  TI expert:

We are using the AM62A SoC chip. After flashing the eMMC according to the method described in this TI reference link:
https://dev.ti.com/tirex/explore/node?node=A__AQkwMvG9F0GKWPdIDOFokg__AM62A-ACADEMY__WeZ9SsL__LATEST
the system fails to boot from eMMC with absolutely no console output.

Critical details:

  1. This is the first-time programming of the eMMC – the storage was completely blank prior to flashing.

  2. We confirm the three bootloader files (tiboot3.bin, tispl.bin, and u-boot.img) have been successfully flashed to the /dev/mmcblk0boot0 partition.

  3. Please confirm whether any additional steps are required to enable normal eMMC boot functionality.

Thank you for your assistance!

Best regards,
Kangbai Li

  • 0
    TI__Prodigy 530 points

    Hi Kangbai Li,

    Could you confirm that the boot switches have been set for eMMC boot as shown here - 
    https://dev.ti.com/tirex/explore/node?node=A__AdiJTo4R4V5RmRA6eK4Ocg__AM62-ACADEMY__uiYMDcq__LATEST

    Regards,
    Johnson

  • 0 in reply to Johnson John
    Prodigy 50 points

    Hi Johnson,

    I have definitely confirmed that the boot mode is set to eMMC.

    Best regards,
    Kangbai Li

  • 0 in reply to kangbai li
    TI__Prodigy 530 points

    Hi Kangbai,

    I'm looping in an expert. Please allow him some time to get back to you.

    Regards,
    Johnson

  • 0 in reply to Johnson John
    TI__Guru 69831 points

    Hello,

    Could you please confirm if you have followed the below steps as well

    dev.ti.com/.../dev-flash-linux-emmc.html

    Thanks!

  • 0 in reply to Prashant Shivhare
    Prodigy 50 points

    Hi,

    Yes, we burned the emmc according to the method in the link. Below is the script we wrote

    Fullscreen 2210.emmc.txt Download 
    #!/bin/bash

echo "emmc flash start"
echo "emmc flash start"
echo "emmc flash start"
echo "emmc flash start"
echo "emmc flash start"
echo "emmc flash start"
echo "emmc flash start"
echo "emmc flash start"


echo 0 > /sys/block/mmcblk0boot0/force_ro

 dd if=/home/tiboot3-am62ax-hs-fs-evm.bin of=/dev/mmcblk0boot0 seek=0
 dd if=/home/tispl.bin of=/dev/mmcblk0boot0 seek=1024
 dd if=/home/u-boot.img of=/dev/mmcblk0boot0 seek=5120


fdisk /dev/mmcblk0 <<EOF
d
n
p
1
1024000
15269854
y                                      //有etx4格式时需要运行
w
EOF
umount /dev/mmcblk0p1
mkfs.ext4 /dev/mmcblk0p1
mkdir -p /mnt/temp
mount -t ext4 /dev/mmcblk0p1 /mnt/temp
cd /mnt/temp
tar xf /home/tisdk-tiny-image-am62axx-evm.rootfs.tar.xz
cd ..
umount temp

    Best regards,
    Kangbai Li

  • 0 in reply to kangbai li
    TI__Guru 69831 points

    Hello,

    The previous link refers to the section

    Change Boot Mode and U-Boot Env

    Have you done the steps listed in this section?

  • 0 in reply to Prashant Shivhare
    Prodigy 50 points

    Hi,

    Yes, I omitted that step. Now my board can boot normally from eMMC. However, we now have another issue: during the "Change Boot Mode and U-Boot Env" step, we need to input commands in the UART console. We want to avoid manual input in the UART console because we have a large number of boards requiring eMMC programming, and this approach would be too inefficient. We hope that after inserting the SD card, the system can run our custom script to program the eMMC and change the boot mode. Then, after removing the SD card, the board can boot normally from eMMC. Is there a way to achieve this?

    Best regards

    Kangbai Li

  • +1 in reply to kangbai li
    TI__Guru 69831 points

    Hello,

    The "mmc partconf" and "mmc bootbus" commands can be saved in the uEnv.txt file which is present in the SD card FAT partition. This file is loaded by the A53 U-Boot allowing running certain commands before booting Linux.

    [11:26:59.257] root@am62xx-lp-evm:/run/media/boot-mmcblk1p1# cat uEnv.txt
[11:27:01.512] # This uEnv.txt file can contain additional environment settings that you
[11:27:01.531] # want to set in U-Boot at boot time.  This can be simple variables such
[11:27:01.536] # as the serverip or custom variables.  The format of this file is:
[11:27:01.540] #    variable=value
[11:27:01.545] # NOTE: This file will be evaluated after the bootcmd is run and the
[11:27:01.549] #       bootcmd must be set to load this file if it exists (this is the
[11:27:01.553] #       default on all newer U-Boot images.  This also means that some
[11:27:01.563] #       variables such as bootdelay cannot be changed by this file since
[11:27:01.566] #       it is not evaluated until the bootcmd is run.

[11:27:01.569] uenvcmd=mmc partconf 0 1 1 1;mmc bootbus 0 2 0 0

    The environment variables "mmcdev" and "bootpart" have to be modified directly in the U-Boot source code for the A53 U-Boot to boot Linux from eMMC automatically.

    diff --git a/board/ti/am62ax/am62ax.env b/board/ti/am62ax/am62ax.env
index f36ac17593f..ea0d81b11fe 100644
--- a/board/ti/am62ax/am62ax.env
+++ b/board/ti/am62ax/am62ax.env
@@ -14,8 +14,8 @@ run_kern=booti ${loadaddr} ${rd_spec} ${fdtaddr}
 
 boot_targets=mmc1 mmc0 usb pxe dhcp
 boot=mmc
-mmcdev=1
-bootpart=1:2
+mmcdev=0
+bootpart=0:1
 bootdir=/boot
 rd_spec=-
 rproc_fw_binaries= 0 /lib/firmware/am62a-mcu-r5f0_0-fw 2 /lib/firmware/am62a-c71_0-fw