On Sep 27 at 20:14, Manuel Bouyer spoke:

> On Fri, Sep 27, 2002 at 07:03:49PM +0200, Hanspeter Roth wrote:
> > How can one control the data transfer mode of Atapi drives?
> 
> With flags in the kernel config file. See wdc(4), wd(4) and cd(4).
> But if the kernel say it's using Ultra-DMA mode 2 at boot time, and
> doesn't say anything else later, then it's really using Ultra-DMA mode 2.

Later?! You are right. I haven't realized this.

pciide1:0:0: lost interrupt
        type: atapi tc_bcount: 32 tc_skip: 0
pciide1:0:0: bus-master DMA error: missing interrupt, status=0x21
cd1: transfer error, downgrading to Ultra-DMA mode 1
cd1(pciide1:0:0): using PIO mode 4, Ultra-DMA mode 1 (using DMA data transfers)

What could be the cause?
Does the cable matter? Do I need 80 pin cables?

-Hanspeter