Jeff Garzik wrote:

me either, unless I can figure out a way to detect that a disk is PATA 
not SATA.  Nothing is obvious from the specs on www.t13.org, but who knows.

According to the Serial ATA docs, IDENTIFY DEVICE word 93 will be zero 
if it's Serial ATA.  Who knows if that's true, given the wierd wild 
world of ATA devices.

So, given the attached patch, you could try and create a generic 
ata_dev_config that all drivers call, that does something like

	/* limit bridge transfers to udma5, 200 sectors */
	if ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev))) {
                 printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
                        ap->id, dev->devno);
		ap->udma_mask &= ATA_UDMA5;
                 ap->host->max_sectors = ATA_MAX_SECTORS;
                 ap->host->hostt->max_sectors = ATA_MAX_SECTORS;
                 dev->flags |= ATA_DFLAG_LOCK_SECTORS;
	}

Regards,

	Jeff