Re: [RFC] I/O Access Abstractions

Jeff Garzik (jgarzik@mandrakesoft.com)
Tue, 03 Jul 2001 04:00:09 -0400


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