Finn,
On Thu, 15 Nov 2012, schmitz wrote:
It should be reasonably easy if the new core ESP driver can be convinced
to send SCSI command data by programmed I/O (the old drivers set that
flag, but it has disappeared from the new core).
The Mac ESP driver has been ported successfully though, and that should
have suffered from the same sort of problems really. Maybe it Just Works
(tm).
The ESP core uses DMA for just about everything, but it leaves it to the
low level driver to implement the actual DMA routines.
I've seen that - the old Amiga drivers only set the DMA start address
but no transfer length, no idea whether that will work for command data.
The mac_esp driver uses PIO when running on 660av and 840av Macs since the
DMA controller device is a mystery. mac_esp uses PDMA on the other mac
models because PIO performance is lousy.
I had to make a couple of changes to the esp core when implementing PIO
for mac_esp but it works fine AFAIK.
As long as PIO works in some way in the current core, we can always
start the painfully slow way and test the DMA functions based on that.
Thanks,
Michael
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