We want to use dd command to download uboot image instead of MFGtool to fast debugging process as the following Freescale documents mention:
Although the steps can be finshed, the uboot remains the same as before. We made a special printf flag to verify this. However, with the same uboot image, MFGtool can update it without problem. Is there any extra step has to be done ? security etc.
By the way, there is NO problem with dd recocery Image.
We are testing sabresd_6dq for smart devices and anroid 4.4.3.
Thanks for any suggestion.
2: Android user guide:
- 4.1.3 Downloading images with dd utility
The Linux utility "dd" on Linux computer can be used to download the images into the MMC/SD/TF card.
Before downloading, ensure that your MMC/SD/TF card partitions are created as described in Storage partitions.
All partitions can be recognized by the Linux computer. To download all images into the card, use the commands below:
Download the U-Boot image:
# sudo dd if=u-boot.imx of=/dev/sdx bs=1K seek=1; sync
Download the boot image:
# sudo dd if=boot.img of=/dev/sdx1; sync
Download the Android system root image:
# sudo dd if=system.img of=/dev/sdx5; sync
Download the Android recovery image:
# sudo dd if=recovery.img of=/dev/sdx2; sync