[Qemu-devel] QEMU and REAL media (CD's, DVD's, floppies)

[Qemu-devel] QEMU and REAL media (CD's, DVD's, floppies)

[Hetz Ben Hamo]

Hi,

Just a small question for my howto:

Does QEMU at the moment support real medias like floppies or CD's? if so, how 
to use it?

Thanks,
Hetz

Re: [Qemu-devel] QEMU and REAL media (CD's, DVD's, floppies)

[Daniel Serpell]

El Wed, May 26, 2004 at 07:11:43PM +0300, Hetz Ben Hamo escribio:
> Hi,
> 
> Just a small question for my howto:
> 
> Does QEMU at the moment support real medias like floppies or CD's? if so,
> how to use it?
> 

Simple:

 qemu -cdrom /dev/cdrom -fda /dev/fd0

You need read/write permisions to the cdrom/floppy devices (in Debian,
it means add your user to groups "cdrom" and "floppy".


    Daniel.

Re: [Qemu-devel] QEMU and REAL media (CD's, DVD's, floppies)

[Markus Niemistö]

On Thu, 27 May 2004 09:58:44 -0400
Daniel Serpell <daniel@atmlab.utfsm.cl> wrote:

> Simple:
> 
>  qemu -cdrom /dev/cdrom -fda /dev/fd0
> 
> You need read/write permisions to the cdrom/floppy devices (in Debian,
> it means add your user to groups "cdrom" and "floppy".

CD-ROMs don't work on FreeBSD (I've mentioned this earlier, too). On
FreeBSD one only can read CDs in 2048 byte blocks. QEMU tries to read a
smaller blocks, at least when it tries to figure out whether the image
is a COW image.

I had some patches lying around, but they fixed the problem only
partially. CDs work with Bochs, however. So Bochs is aware of this
restriction.

Markus

Re: [Qemu-devel] QEMU and REAL media (CD's, DVD's, floppies)

[Emre Ersin]

>Simple:
>
> qemu -cdrom /dev/cdrom -fda /dev/fd0
>
>You need read/write permisions to the cdrom/floppy devices (in Debian,
>it means add your user to groups "cdrom" and "floppy".
>
>  
>
It doesn't work. Because qemu tries to open them at startup and if there is no media it will simply give error. One way is showing some dummy images at startup and changing after boot.