I have a similar problem. Maybe even worse.. If I change the way the hard
drives are connected (like swap hda and hdb), changin the master/slave
jumpers, the system does not boot at all...
I had to find, what it seems a unique configuration in which it boots, but
no DMA on the second IDE channel. I could turn DMA on with hdparam and as
soon as I accessed the disk, it was disabled as in your case...
I gave-up... I blame it on the stupid PIIX (Triton) chip, I have...
Or maybe I am stupid, which is possible too :-)
Anyway, I am following this thread with interest... :-)
> Then I'll run a program that requires a disk read, such as, for example,
> find /
>
> It locks for a while (about ten seconds) then I run dmesg. The last
> lines are self-explanative:
>
>
> hdc: timeout waiting for DMA
> hdc: irq timeout: status=0x58 { DriveReady SeekComplete DataRequest }
> hdc: timeout waiting for DMA
> hdc: irq timeout: status=0x58 { DriveReady SeekComplete DataRequest }
> hdc: timeout waiting for DMA
> hdc: irq timeout: status=0x58 { DriveReady SeekComplete DataRequest }
> hdc: timeout waiting for DMA
> hdc: irq timeout: status=0x58 { DriveReady SeekComplete DataRequest }
> hdc: DMA disabled
> ide1: reset: success
>
>
> The system disables DMA. It gives me an IRQ timeout.
>
> BIOS is fine. Everything is fine but DMA. What should I do? Break my
> MotherBoard in half? :-))
>
> I've already tried hdparm -c 0, -c 1, -c 2, -c 3. I've also tried hdparm
> -u 1. Results: Still no DMA.
>
> Wierd, eh?
