On Wed, Nov 2, 2011 at 8:35 AM, Zhi Yong Wu <zwu.ker...@gmail.com> wrote: > HI, guys, > > I managed to change one cdrom on guest from DMA mode to PIO mode, but > failed. Did anyone also met this same issue before? If you have some > experience to solve this, Can you share with me?
Since no one knows the answer off-hand you can find out the reason for yourself by looking at the hdparm and Linux driver code to see how it switches modes. Then look at QEMU's emulation to see why it's not working. Stefan
