Re: StrongARM and AMD LANCE PCI NETCARD

[Philip Blundell]

>No, just map an uncached, unbuffered memmory space for the PCI environment 
>and the problem will go away (if it is a cache related issue, that is...)

It's not quite that simple.  We already map PCI I/O and memory uncached.  The 
difficulty with DMA-enabled network drivers is that they want to access main 
memory which obviously needs to be cached for performance reasons.  So 
explicit synchronisation instructions are needed.

We've previously kicked around the idea of adding a GFP_UNCACHED flag to 
__get_free_page to help with this but nobody has implemented it yet.

p.


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