Alan Stern wrote:
On Fri, 4 Jun 2004, Pete Zaitcev wrote:
It seems obvious to me that a kmap is missing somewhere, but where?
Only in the PIO path, yes? Unless sg_map() doesn't map ...
-- Pete
It's funny you should bring this up. I've mentioned it to David Brownell
on at least two occasions (sometimes I forget that I've already asked a
question).
And I've agreed with "kmap missing" ... someone with the relevant
hardware (or otherwise motivated!) can/should fix it.
- Dave
The current answer is that the most widespread host controllers do use
DMA, and the ones that don't generally aren't used on systems with more
than 1 GB of memory. So for now it's not a problem, although it may
become a problem in the future.
Alan Stern
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