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Re: [Qemu-devel] Problem with `change' monitor command
From: |
Daniel P. Berrange |
Subject: |
Re: [Qemu-devel] Problem with `change' monitor command |
Date: |
Wed, 17 Sep 2008 12:53:35 +0100 |
User-agent: |
Mutt/1.4.1i |
On Wed, Sep 17, 2008 at 01:46:13PM +0200, Robert Riebisch wrote:
> Hi!
>
> I'm using QEMU 0.9.1 and SVN on Win32 to emulate an x86 PC environment.
>
> With `change floppy0 foo.img' I'm able to use another floppy image on
> the fly, but this will only work, if the new floppy image is of the same
> size as the old one. Switching from, e.g., 1.44M to 2.88M is not
> recognized by the guest OS. Even rebooting the VM doesn't help, because
> CMOS value 0x10 ("Floppy Drive Type") won't be adjusted.
> (http://www.brl.ntt.co.jp/people/takehiko/interrupt/CMOS.LST.txt)
>
> This is also a big problem when you omit "-fda bar.img" from the command
> line. You can still change the image file in QEMU monitor, but guest OS
> (here: DOS) will never recognize it, because CMOS value 0x10 still holds
> "0" (= "none" for floppy0 and floppy1). Btw: It would be more
> consistently to also change command-line option "-fda" to "-floppy0".
The -fdXX, -hdXX, etc args are all legacy syntax. The recommended way
to specify disks is via the -drive parameter, so no change to -floppy0
is required.
Daniel
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