Re: [Qemu-devel] format=raw,readonly errors

[Carl Karsten]

On Mon, May 8, 2017 at 3:51 AM, Markus Armbruster <address@hidden> wrote:

> Carl Karsten <address@hidden> writes:
>
> > address@hidden:~/temp$ qemu-system-x86_64 -m 256 -display curses  -drive
> > file=disk.cow -drive file=boot.img
> > WARNING: Image format was not specified for 'boot.img' and probing
> guessed
> > raw.
> >          Automatically detecting the format is dangerous for raw images,
> > write operations on block 0 will be restricted.
> >          Specify the 'raw' format explicitly to remove the restrictions.
> >
> > This is OK, as I don't want anything writing to that thing anyway.  So to
> > get rid of the waring:
> >
> > address@hidden:~/temp$ qemu-system-x86_64 -drive
> > file=boot.img,format=raw,readonly qemu-system-x86_64: Can't use a
> read-only
> > drive
> > qemu-system-x86_64: Initialization of device ide-hd failed: Device
> > initialization failed.
>
> -drive without if=... creates an IDE disk[*].  IDE disks can't do
> read-only.  Have you tried omitting ",readonly"?
>


omitting works, but my goal was for the drive to be read only.




>
> > hmm... one more try:
> >
> > address@hidden:~/temp$ qemu-system-x86_64 -m 256 -display curses  -drive
> > file=disk.cow,readonly
> > qemu-system-x86_64: Can't use a read-only drive
> > qemu-system-x86_64: Initialization of device ide-hd failed: Device
> > initialization failed.
>
>
> [*] It actually depends on the machine, but I figure that's of no
> interest to you.
>



-- 
Carl K