Re: alpha iommu fixes

From: Alan Cox (alan@lxorguk.ukuu.org.uk)
Date: Tue May 22 2001 - 16:08:21 EST

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> On Tue, May 22, 2001 at 05:00:16PM +0200, Andrea Arcangeli wrote:
> > I'm also wondering if ISA needs the sg to start on a 64k boundary,
> Traditionally, ISA could not do DMA across a 64k boundary.

The ISA dmac on the x86 needs a 64K boundary (128K for 16bit) because it
did not carry the 16 bit address to the top latch byte.

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