Re: 2.1.111: IDE DMA disabled?

Alan Cox (
Mon, 27 Jul 1998 10:51:19 +0100 (BST)

> 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


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