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 - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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