AVR-Chat

> Ideally, "read a 400 MB file sequentially from start to end, then stop."

What I'm asking is wether you need to actually READ those bytes, or
just cause them to go from one device to the other, external of the
AVR.
This might be solvable with some simple hardware.

> Less ideal, sequentially read the first 400 MB off the card, raw. This
> means I'll have to provide a utility for placing the data on the card.

I used raw data, with links between each of the frames, so that any
frame tells you the address of the next frame, and other frames that
it could branch to under certain conditions, plus the delay in mS
between this frame and the default next frame.