Re: How to invoke burst-read on PCI mapped memory area

Alan Cox (alan@lxorguk.ukuu.org.uk)
Mon, 12 Oct 1998 17:59:26 +0100 (BST)


> So my question is :
> * Is there any way to invoke Burst-Read transaction on PCI from CPU
> on Linux/i386 kernel 2.0.X ?

Not easily

> * Is there any way to enable cache attribute on PCI memory space ?

Sort of related.

The 2.1.x kernel trees have MTRR support, in 2.0.x you will have to do it
directly. Basically on a P6 you can tell the CPU this memory area has
these parameters - that includes "write gathering" - ie burst write.

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