Besides the user area an emmc device also offers two dedicated boot partitions to store the U-Boot bootloader. This tutorial describes how to use these boot partitions with the TQ modules.

• Configured TFTP Server on the development host to upload the U-Boot to the target hardware, please see how to setup TFTP Server
• u-boot binary to store (e.g. u-boot.bin)
• Set Starterkit DIP switches to eMMC boot, please see
  • TQMa6x DIP switch settings
  • TQMa7x DIP switch settings
  • TQMa6ULx DIP switch settings

setenv uboot <u-boot>

Example

setenv uboot uboot.bin

Please see how to set up network configuration

Load the u-boot binary as shown below.

  tftp ${uboot}

  setexpr bc ${filesize} + 1ff
  setexpr bc ${bc} / 200

boot partition 1

  mmc dev ${mmcdev} 1
  mmc write ${loadaddr} 2 ${bc}

boot partition 2

  mmc dev ${mmcdev} 2
  mmc write ${loadaddr} 2 ${bc}

  mmc dev ${mmcdev} 0

After writing u-boot binary, select arcording eMMC Boot partition.

User Area boot (default)

mmc partconf ${mmcdev} 0 0 0

Boot Partition 1

mmc partconf ${mmcdev} 0 1 0

Boot Partition 2

mmc partconf ${mmcdev} 0 2 0

Reset the System to make the changes effective