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[83.42.57.116]) by smtp.gmail.com with ESMTPSA id v20sm1368424edr.85.2020.04.03.04.07.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 03 Apr 2020 04:07:38 -0700 (PDT) Subject: Re: Qemu doesn't detect hard drive To: Peter Maydell , "Aijaz.Baig" References: From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Message-ID: <5c877825-dbf0-295e-20b7-6949e15be745@redhat.com> Date: Fri, 3 Apr 2020 13:07:37 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.120 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "qemu-devel@nongnu.org" , Markus Armbruster Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 4/3/20 9:39 AM, Peter Maydell wrote: > On Fri, 3 Apr 2020 at 06:18, Aijaz.Baig 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 >