I am basically looking to switch_root from initrd to the full fledged Linux rootfs but this is only the first step. But I don't know the basics and why I am getting this problem. I know the older -hda has been changed to a newer -drive option can combines the cumbersome specification of the front and back ends separately. I think I need to understand how block devices work with Qemu. Qemu-img create disk.img 10G & mkfs.ext2 -F disk.imgįrom the log messages I see that it has not been able to detect this at all. Of course I first create a disk image and format it as ext2: kernel-qemu-4.4.-jessie are images compatible with Raspbian Jessie and Wheezy. 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 Subject: qemu-system-arm: qemu-system-arm crashes when run as part of the nbdkit testsuite Date: Tue, 21:07:13 +0100 Package: qemu-system-arm Version: 1:2.11+dfsg-1 Severity: grave Dear Maintainer, I just got an nbdkit build failure from the armhf autobuilders. To use these images, youll need the versatile-pb.dtb file which is also contained in this repository. 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. Sudo qemu-system-arm -m 512M -M vexpress-a9 -D qemu.log -d unimp -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 Write(2, "Device 'tap' could not be initia".I have a working QEMU image emulating an ARM vexpress-a9 and I run it like so: Write(2, "could not configure /dev/net/tun"., 64could not configure /dev/net/tun (tap0): Operation not permitted) = 64 Ioctl(7, TUNSETIFF, 0x7ffcc532ab30) = -1 EPERM (Operation not permitted) Ioctl(7, TUNSETVNETHDRSZ, 0x7ffcc532ab28) = -1 EBADFD (File descriptor in bad state) Generating flash0.img on Jammy when emulating Jammy with the cloud image of Jammy may help. For example, if you generated flash0.img on Focal but want to emulate Jammy with the cloud image of Jammy, the firmware is not fully compatible. Ioctl(7, TUNGETFEATURES, 0x7ffcc532ab2c) = 0 No Output and No Response If such thing happens to you, align your host and guest release version may help. The relevant output from strace is presented below: open("/dev/net/tun", O_RDWR) = 7 That is where the initrd is a ramdisk as opposed to a compressed cpio archive unpacked by the kernel in a ramfs, and with the old way to switch to the end device. Qemu-system-arm: -net tap,ifname=tap0: Device 'tap' could not be initialized 3 Answers Sorted by: 9 What's happening is that you're trying to boot Linux in the 'Obsolete' way. Qemu-system-arm: -net tap,ifname=tap0: could not configure /dev/net/tun (tap0): Operation not permitted However, when I attempted to start a qemu virtual machine with the interface, I encountered the following error: qemu-system-arm -net tap,ifname=tap0 I also confirmed that I am in the netdev group: groups Size: 0 Blocks: 0 IO Block: 4096 character special fileĭevice: 6h/6d Inode: 1224 Links: 1 Device type: a,c8Īccess: (0660/crw-rw-) Uid: ( 0/ root) Gid: ( 108/ netdev) I then ran the commands suggested in this answer: chgrp netdev /dev/net/tunīoth commands completed successfully and I confirmed that they took effect: stat /dev/net/tun qemu-system-gnuarmeclipse -mcu STM32F407VG -machine STM32F4-Discovery -image myfile. I created the device with the following command and attached it to a network bridge I set up: tunctl -t tap0 I have created a tap device ( tap0) which I would like to provide as a network interface to qemu.
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