Hi, On 4/9/21 8:48 AM, Xu, Yanfei wrote: > How can I disable the floppy controller drive when I boot a VM by qemu- > system-x86_64? I did not specify any arguments about floppy, but after > the qemu boots up, linux always can detect floppy drive and then > modprobe the matched floppy.ko. > > qemu version: v5.2 > > command line: > > qemu-system-x86_64 -device virtio-net- > pci,netdev=net0,mac=52:54:00:12:34:02 -netdev > tap,id=net0,ifname=tap0,script=no,downscript=no -object rng- > random,filename=/dev/urandom,id=rng0 -device virtio-rng-pci,rng=rng0 > -drive file=/path/to/images/qemux86-64 > /qemux86-64.ext4,if=virtio,format=raw -usb -device usb-tablet -cpu > core2duo -enable-kvm -m 512 -pidfile /path/to/pidfile_4167420 -m 512 > -snapshot -serial mon:vc -serial null -kernel /path/to/qemux86-64 > /bzImage.bin -append 'root=/dev/vda rw mem=512M > ip=192.168.7.2::192.168.7.1:255.255.255.0 oprofile.timer=1 > printk.time=1' > > As I konw BIOS can control the switch of floppy controller on a real > hardware, But how can I do it on qemu? And does the qemu enable that by > default?
See https://gitlab.com/qemu-project/qemu/-/blob/master/docs/qdev-device-use.txt#L105 * if=floppy -device floppy,unit=UNIT,drive=DRIVE-ID Without any -device floppy,... you get an empty unit 0 and no unit 1. You can use -nodefaults to suppress the default unit 0, see "Default Devices". Regards, Phil.
