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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
