Re: [Fedora-ia64-list] kernel 2.6.16-1.2097_FC6 unbootable on Itanium

From: David Mosberger-Tang <David.Mosberger_at_acm.org>
Date: 2006-03-31 02:43:43
On 3/30/06, Jack Steiner <steiner@sgi.com> wrote:

> Is this problem unique to SN systems

No, the same will happen on all other systems (that I know of).

> The BIOS reports that most
> memory ranges support both CACHED & UNCACHED references. I _think_
> this is correct.

That's correct.  The map shows the ways the page *can* be mapped, not
the way it *should* be mapped.

It's strange that ACPI would prefer to use WC when WB mapping is
possible.  They definitely need to pick one way and stick with it
though.  As you say, mapping the same page with different cacheability
is a no-no (and at least in theory, it should cause an MCA even on
real hardware).

  --david

--
Mosberger Consulting LLC, http://www.mosberger-consulting.com/
-
To unsubscribe from this list: send the line "unsubscribe linux-ia64" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Received on Fri Mar 31 02:43:47 2006

This archive was generated by hypermail 2.1.8 : 2006-03-31 02:44:26 EST