On Tue, Sep 08, 2009 at 12:03:48PM -0400, Alan Stern wrote: > Is there any simple way to force the old IDE driver to limit the DMA > speed for a particular device? > > I've got a situation where a drive claims to be capable of supporting > UDMA/100, but it's in a noisy environment and gets lots of errors at > that speed. I'd like to limit it to UDMA/66 or even UDMA/33. > > The hdparm command should be able to do this but I can't run it until > the system has booted, by which time a bunch of CRC and possibly other > errors have already occurred. Ideally it should be possible to limit > the speed starting as early as device detection, but I can't find any > way to do it. Is there support for such a thing or will I have to hack > it in? Does passing ide=nodma at bootime, and then having init set the DMA at the right speed, would work? Regards, Frederik -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
