Messages in this thread | | | Date | Mon, 27 Jul 1998 13:24:18 -0700 (MST) | From | dalecki <> | Subject | Re: 2.1.111: IDE DMA disabled? |
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On Mon, 27 Jul 1998, Alan Cox wrote:
> > But currently the IDE code is relaying on the fact that the BIOS will do > > it nicely for Generic DMA, which is basically compleatly wrong. Most of > > the BIOSes don't get it right. They just put the system in the most secure > > Almost all BIOSes get it right. Furthermore the BIOS knows what the correct > values are in many cases we cannot even find out or we have to do fairly > tricky stunts to guess. Judging by the sum collection of reports I have > we are also talking about almost nobody having actual problems. > > > wired, since I'm using an very old 430HX chipset board with a 300MHz K6, > > where the BF2 jumper for CPU speed was missing (I have sold it my self to > > ground level) and the processor isn't detected corretly by the BIOS. > > Therefore the BIOS can't detect and set the timings correctly. > > "I took a soldering iron to my motherboard, and now..." > > Get real please. For the general case the BIOS is the only thing with a > good chance of getting the values right I *have* no actual problems too, even in regard of my wired hardware messup, but I have observer a significant drop in performance from 10M/s to about 7M/s after the PIO mode trick got in.
Marcin ========================================================================= In real life: System Programmer at AIS AXON GmbH
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