Re: I/O write ordering

James Bottomley
2004-09-22T15:22:25Z

On Wed, 2004-09-22 at 11:11, Benjamin Herrenschmidt wrote:
> Set by the CPU as non-cacheable.

I know that ... but that definition is architecture specific and not
helpful.

I mean when for I/O transactions does the CPU mark memory as
uncacheable. Is it for the PCI spaces only or for consistent PCI memory
as well? We need to ascertain in generic I/O terms exactly what it is
that you want synchronising.

James