USB How do you create a bootable custom USB application?

Many LCD televisions nowadays have USB ports so you can plug in your camera and it becomes a camera gallery on the TV.

I want to write a gallery program which, when plugged in to the TV, will start to cycle thro开发者_如何学Gough the images on the USB device. How would I do this? Is it possible to write some sort of OS/application which can run on the USB device alone?

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The gallery application is built into the TV, it is not on the USB. I doubt the TV is easily modable nor is there a published API.

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That would depend entirely on the television's firmware whether it would even be supported. If it were, the specification of how to do it would need to be observed.