ncr53c8xx=wide:0 and disable tagged commands with ncr53c8xx=wide:0,tags:0 and force async with ncr53c8xx=wide:0,tags:0,sync:255 and disable dma burst with ncr53c8xx=wide:0,tags:0,sync:255,busrt:0 and disable disconnect with ncr53c8xx=wide:0,tags:0,sync:255,burst:0,disc:n Richard