From: "Philippe Mathieu-Daudé" <philmd@redhat.com>
To: "Xu, Yanfei" <yanfei.xu@windriver.com>, qemu-devel@nongnu.org
Subject: Re: [QUESTION] qemu: how to control the switch of floppy drive
Date: Fri, 9 Apr 2021 09:10:52 +0200 [thread overview]
Message-ID: <ab55b868-8797-70da-3e04-8221bc1fa01e@redhat.com> (raw)
In-Reply-To: <910b1361-3b9f-ec80-794e-fb335b0ef631@windriver.com>
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.
next prev parent reply other threads:[~2021-04-09 7:11 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-09 6:48 [QUESTION] qemu: how to control the switch of floppy drive Xu, Yanfei
2021-04-09 7:10 ` Philippe Mathieu-Daudé [this message]
2021-04-09 8:27 ` Xu, Yanfei
2021-04-09 8:19 ` Markus Armbruster
2021-04-09 8:30 ` Xu, Yanfei
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