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Subjectpc104 ISA bus-mastering & custom hardware
Date

I've been thinking about fabricating my own hardware for a pc104 board
that uses a 16-bit ISA bus. Basically, I want to interface a DSP
such that it has access to the pc104's shared memory. I'm fairly
confident that I can work out the circuit design, but I need to know
more about Linux's ISA support.

1) What is needed to support ISA bus-mastering? I would like the ISA
device to write directly to the pc104's shared memory.

2) What memory regions can I write to? Am I limited to <16MB or is it
more restrictive? 64K-1MB, 15-16MB?

3) How can I reserve a specific memory region? How much memory can I
use? I plan to have a way to communicate to the DSP (via I/O) what
memory address to access.

4) How do I enable a 16-bit DMA channel? Do I need to do anything
beyond enabling DMA?

5) What are some good examples?

6) What else should I be thinking about?

Thanks!
-Paul
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