Re: [RFC] I/O Access Abstractions

Jeff Garzik
2001-07-03T08:00:39Z

David Howells wrote:
> For example, one board I've got doesn't allow you to do a straight
> memory-mapped I/O access to your PCI device directly, but have to reposition a
> window in the CPU's memory space over part of the PCI memory space first, and
> then hold a spinlock whilst you do it.

Yuck. Does that wind up making MMIO slower than PIO, on this board?

--
Jeff Garzik | "I respect faith, but doubt is
Building 1024 | what gives you an education."
MandrakeSoft | -- Wilson Mizner