I don't think you'll get very far debugging the ESP driver. More likely DMA is being corrupted or similar, and this means you should fiddle around in the sun4d IOMMU support code for SBUS and make sure nothing fishy is going on there. - To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html