Re: [Motion] Re: IDE corruption during heavy bt878-induced interr

Alan Cox (alan@lxorguk.ukuu.org.uk)
24 Apr 2003 19:57:28 +0100

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In reply to: joe briggs: "Re: [Motion] Re: IDE corruption during heavy bt878-induced interr upt load [LKM]"

On Iau, 2003-04-24 at 11:31, joe briggs wrote:
> Specifically, if a PCI board is DMA'ing a block of data to main memory, how
> is the operation of the direct-connect IDE device impacted? When most PCI
> devices transfer data to main memory, don't they arbitrate the bus, become
> master, and blast it accross in chunks? Doesn't onboard IDE (legacy?) use
> the DMA controller (8237 derivate I gues) to transfer?

Onboard legacy mode IDE doing PCI DMA is doing it directly. How onboard
and southbridge IDE interact is a complicated field and chipset
dependant.

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