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Original question:

AM3358: SD card image

AM3358: How to create image for Windows SD card creator windows tools

Tony Tang
Mastermind 29182 points
Part Number: AM3358

My customer also ask for the guide. I suppose BU has a ready one, please share with us.

as customer company uses a shared Linux Server remotely, it is not convenient to access the Linux computer physically.

  • 0
    TI__Mastermind 30546 points

    Tony,

    Here are the steps I followed on an Ubuntu 18.04 Host machine to create an image of an SD Card. I verified the card booted on a Beaglebone Black. 

    This process is based on this page, which provides a bit more context on what is being done and may be useful for others.

    Create a File on Host Computer
    fallocate -l 1G sdk.img

    Create a Loop
    sudo modprobe loop
    sudo losetup -f

    Connect the Loop to the File
    sudo losetup /dev/loop10 sdk.img

    *Note this loop needs to be the one created above

    Partition the Loop like you want the SD Card partitioned.
    This follows the SD Card Creation script in the SDK.
    sudo parted -s /dev/loop10 mklabel msdos
    sudo parted -s /dev/loop10 unit cyl mkpart primary fat32 -- 0 9
    sudo parted -s /dev/loop10 set 1 boot on
    sudo parted -s /dev/loop10 unit cyl mkpart primary ext4 -- 9 -2

    Format the partitions
    sudo fdisk -l /dev/loop10
    sudo mkfs.vfat /dev/loop10p1
    mkdir boot
    sudo mount /dev/loop10p1 boot
    sudo mkfs.ext4 /dev/loop10p2
    mkdir rootfs
    sudo mount /dev/loop10p2 rootfs/

    Copy files to the partitions. The example below assumes the SDK is in TISDK.
    This was tested on a beaglebone black, adjust as needed.
    cd TISDK/board-support/prebuilt-images/
    sudo cp am335x-boneblack.dtb /home/boot/
    sudo cp MLO-am335x-evm /home/boot/MLO
    sudo cp u-boot-am335x-evm.img /home/boot/u-boot.img

    Untar the filesystem. This uses the base filesystem provided with the SDK.
    cd ../../filesystem
    sudo tar -xvf arago-base-tisdk-image-am335x-evm.tar.xz -C /home/rootfs/
    sync

    cd back to where boot and rootfs were created
    sudo umount boot rootfs

    Delete the loop
    sudo losetup -d /dev/loop10

    Copy the file to an SD Card. Note that /dev/sde needs to be where the SD Card
    is mounted on the Host computer.
    sudo dd bs=4M if=sdk.img of=/dev/sde conv=fsync
    sync
    sync

    That's it. Unmount and eject the SD card from the host and use it to boot the target board. 

    The filesystem will be limited to the size of the image created above. In this case, it is 1GB. You can create the file larger to be closer to your SD Card size or resize it on the target as needed once booted.

    Hope this helps.