Booting Linux in sub-second on an embedded HW

I would like to use Linux on an embedded HW and my application requires the
system to start operation as soon as it is switched on.
(As an example, imagine a VCR, which start operation in a fraction of
second.)

I did not seleted the HW yet. I need 4xRS232 port + 4xUSB host interface +
100 MBit/sec Ethernet + Video card + Mouse & Keyboard input + 48 general
purpose parallel I/O lines + (battery operated) + physical dimensions are as
small as possible.

Can you advise me if it is possible to start/boot a version of Linux in
sub-second (100-800 millisecond)?
Do you know any embedded HW with the above specs?

Thanks


.

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