Re: Qemu doesn't detect hard drive

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 4/3/20 9:39 AM, Peter Maydell wrote:
> On Fri, 3 Apr 2020 at 06:18, Aijaz.Baig <Aijaz.Baig@protonmail.com> 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
>