Ingredients of a System Image

Our DHCOM computer on module units are supplied initially programmed with the bootloader U-Boot. We offer pre-programming with the complete system image (including customer application) for the delivery in the series. The following table indicates which components therefor necessarily have to be already provided by you and which are optional depending on the situation.

Linux

In the following table lists all ingredients of a Linux system image. For automatic programming images the latter components are required in addition.

Image Component	Required	Recommended	Note
Bootloader U-Boot	No	No	In the most cases there are no project specific features in the bootloader. If you do not provide a customized bootloader we at DH electronics assume it is ok to use our latest version with the best hardware support.
U-Boot Environment	No	Yes	If your project does not need any special variables or kernel arguments we use our latest standard bootloader u-boot environment. A quick change during the development can be missed likely. We recommend to provide your "printenv" output.
Settings	Yes	Yes	For details have a look at DHCOM Settings
Splash Bitmap	No	Yes
uLinuxEnv.txt	No	Yes	Please refer to "U-Boot Environment". uLinuxEnv.txt is a enhancement of the U-Boot Environment.
Linux Kernel	Yes	Yes
Linux Devicetree	Yes	Yes
Linux Rootfilesystem	Yes	Yes	Your application and services should be installed in the rootfilesystem.
Automatic Prog. Images			The following components are used to program the image. They are not programmed to the target, they are a tool for programming.
Update Kernel	Yes	Yes	Please visit the download area of the appropriate DHCOM device.
Bitmaps <br\>- progress.bmp<br\>- error.bmp<br\>- done.bmp	No	Yes	This Bitmaps are shown on the display during programming. Not required for headless systems.
DHupdate.ini	Yes	Yes	For further information see I.MX6 Update Mechanism or DHCOM Flash Update (i.MX25 und AM35x)