Re: Qemu doesn't detect hard drive

[Philippe Mathieu-Daudé]

On 4/3/20 9:39 AM, Peter Maydell wrote:
> On Fri, 3 Apr 2020 at 06:18, Aijaz.Baig <address@hidden> wrote:
> > I would now like to add a hard disk for persistent storage and then transfer 
> > control from busybox initrd based rootfs over to the full fledged version 
> > offered with Linux. So I add it to the command line
> >
> > `sudo qemu-system-arm -m 1024M -M vexpress-a9 -D qemu.log -drive 
> > if=none,format=raw,file=disk.img -kernel buildroot-2019.02.5/output/images/zImage -dtb 
> > buildroot-2019.02.5/output/images/vexpress-v2p-ca9.dtb -append 
> > "console=ttyAMA0,115200 kgdboc=kbd,ttyAMA0,115200 ip=dhcp nokaslr" -initrd 
> > buildroot-2019.02.5/output/images/rootfs.cpio -nographic -net nic -net bridge,br=mybridge 
> > -s
>
> This command line creates a "drive" object but doesn't plug it in to anything
> (it's like asking QEMU to model a board, with a hard drive sat next to it
> on the desk but no cable between them :-))

Should QEMU warn the user about unplugged drives?

Or is it an expected feature (these drives might be hot-plugged later?)

> More generally, the vexpress-a9 board does not support hard disks.
> This is because the real hardware we're modelling here has no disk
> drive interfaces and no PCI or similar bus that you could plug a
> scsi controller into. The best it can do for storage is an SD card
> emulation, which works but the performance is not great.
>
> thanks
> -- PMM