I have modified the parport user space driver to do hardware ECP, DMA
(Using 2.3.99pre8 and just copying the DMA write concept)
It is not pretty (i'm a hardware guy) but I can post it if you want it.
Even with the user space driver, the ECP/DMA concept is interrupt driven
in terms of waiting for the terminal count (TC), but I am not sure how to
extend the DMA size past the 64K bytes.
I found the throughput to be quite fast (about 1 byte/ usec) but there is
never guarenteed servicing... ie. the task can be swapped out of priority
for about 50 usec. I needed guarenteed throughput so I am using EPP with
user defined extra handshaking.
Hope this helps and if you have more questions ask away,
-- Derek Bouius | American Biometric Company | Tel:(613)736-5100x281 firstname.lastname@example.org | 3429 Hawthorne Rd,Ottawa,ON | Fax:(613)736-1742
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