"Remote" frambuffer - is it possible?

We're planning to hook up an ARM running Linux to 
a DSP that has a video (NTSC) output. We'd like to
develop a framebuffer driver that displays on the TV.
However, there's no shared memory between the ARM
and the DSP so we're planning on using I/O to move
data between the two processors. Questions:

- Does something like this exist? I'd like to look at some
source to gauge the complexity.

- Can we know when to shovel the data from the ARM
to the DSP? (Similar question asked in another thread,
I'll follow that too)

- Is there a "null" framebuffer driver which simply provides
the interface to apps but doesn't actually do anything
with the pixels? Seems like that would be a good place
to start. If not, which simple driver should I look at to
get an in-depth understanding of how this stuff works?

Thanks much,
Andrew Queisser



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