Re: Linux kernel 3.2.0-3-amiga misses Cyberstorm 1 SCSI
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.
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.
Finn
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