On Sun, Jul 16, 2006 at 02:06:37PM -0500, J.D. Bronson wrote:
> thanks for the reply. yes, I am using brand new 80 pin cables. One 
> for each drive with 1 drive per channel and nothing else like a CDROM..

Can you recompile a kernel? If not, what kernel would you need for 
testing?

The code in question is in src/sys/dev/pci/rccide.c around line
216:

                if ((atac->atac_cap & ATAC_CAP_UDMA) &&
                    (drvp->drive_flags & DRIVE_UDMA)) {
                        /* use Ultra/DMA, check for 80-pin cable */
                        if (drvp->UDMA_mode > 2 &&
                            (PCI_PRODUCT(pci_conf_read(sc->sc_pc, sc->sc_tag,
                                                       PCI_SUBSYS_ID_REG)) 
                             & (1 << (14 + channel))) == 0)
                                drvp->UDMA_mode = 2;

You could try to comment out the

	/* drvp->UDMA_mode = 2 */ ;

and see how that kernel works.

Martin