Here is a quick overview you can follow to get your very first contact with i.MX53 QSB.
Out of box i.MX53 QSB video booting up Ubuntu
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Out of box i.MX53 QSB video booting up Ubuntu with some demo (GPU and VPU)
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Here, you should have loaded your board with the out-of-box SD card. Next step is create your own SD card with some pre-built image.
You can find pre-built image packages from Freescale for Linux
look for Linux Binary Demo file
Please, go to Timesys wikipage[1] and see how to load a pre-built image.
You can use some Freescale image or some Timesys image. Both will work!
For loading linux OS you need at least 3 images:
For iMX53QSB the default bootloader provided by Freescale is u-boot.You can build your own image using LTIB following the same procedure from here.
You can build a new uImage (kernel binary image to be loaded by u-boot) using LTIB, and you can follow the instructions from here
Root file system is a set of directories and files that become the system environment.
In case you want to boot via NFS, please follow the next procedure instead.
Be aware the kernel command line you set on u-boot variable can configure the display.