Re: kernel 2.4.27 doesn't set dma
On Mon, 23 Aug 2004 12:10:08 +0200, Alexei Chetroi wrote:
> Hi,
>
> I've recently upgraded to kernel 2.4.27 and noticed that my disk
> doesn't use dma, though it was instructed to do so by hdparm. cat
> /proc/pci shows me
> Bus 0, device 31, function 1:
> IDE interface: Intel Corp. 82801BA IDE U100 (rev 18). I/O at
> 0xfc00 [0xfc0f].
> and on previous versions I've used module piix.o for this chipset. But
> on 2.4.27 piix gets loaded but is unused, which is strange.
> /proc/ide/piix isn't created either on module load with 2.4.27. Does
> anybody had same problems? Any hints?
Others may disagree, but I am of the opinion that all ide chipset and hard
disc related drivers should be compiled directly into the kernel instead
of getting loaded as a module. When you load the piix module the kernel
is being asked to make some major changes to an IDE subsystem that has
already been initialized by the generic PCI IDE driver and is in use. The
kernel may balk at that and refuse to touch a busy device.
When specific IDE chipset drivers are compiled directly into the kernel
those drivers will superceed the generic driver and initialize the ide
system properly the first time around.
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