From: "JWM" <jwm@systemfabricworks.com>
To: linux-ia64@vger.kernel.org
Subject: EFI returning incorrect value?
Date: Tue, 26 Sep 2006 16:55:36 +0000 [thread overview]
Message-ID: <004001c6e18c$972938d0$7401a8c0@Maelstrom> (raw)
Hi all;
I've been trying to work through issues related to write combining on a
Bull Ia64 system and something caught my attention.
efi_range_is_wc returns a 0 - false or 1- true to say whether the
address range is available for write combining.
It calls efi_mem_attributes i.e.
if(!(efi_mem_attributes(paddr) & EFI_MEMORY_WC))
return 0;
However - the attribute returned from efi_mem_attributes is often 0 -
which is defined as EFI_MEMORY_RUNTIME - or the range requires a runtime
mapping. This doesn't seem to be what was wanted - unless EFI must have a
mapping on this platform before WC is available for some reason.
Can anyone enlighten me on this?
....JW
next reply other threads:[~2006-09-26 16:55 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-26 16:55 JWM [this message]
2006-09-26 19:25 ` EFI returning incorrect value? Bjorn Helgaas
2006-09-28 19:15 ` Bjorn Helgaas
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