![]() ![]() 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: 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 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 reboot your system and check the dmesg.I have a working QEMU image emulating an ARM vexpress-a9 and I run it like so:.(We have added list command to see what is there inside /dev directory) Starting few lines of your init would be likeĪdd ::respawn:/sbin/ls -all /dev and save the file. open init file in your favorite editor.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. If you are lucky then it would be lying in root directory. No Output and No Response If such thing happens to you, align your host and guest release version may help. Because if your major number is not the required one then it will not invoke respective kernel functionality and in that case it will only be a junk character device.Īlso can you post the whole log file (copy all those dmesg and post those somewhere and give link here.)Īnd if you are sure that /dev/ttyS0 is there then do the following steps :įind out which init file kernel is using as parent process. I'm new to Buildroot, so any hint or suggestion is more than welcome.Įxtract rootfs and type ls -all /dev/ttyS0 and check it's major and minor number. In short, it allows you to run Windows, Linux. To somehow create device(s) there (Buildroot does not do that), and then rebuild the filesystem? UTM is a full featured system emulator and virtual machine host for iOS and macOS. Have I missed something in configuring the filesystem? Or should I use filesystem in I have checked the contents of rootfs.cpio like this: If Linux kernel dislikes something about that, it's possible that it will crash early or just hang because it is not aware of sudden changes in expected architecture. done.Ĭan't open /dev/ttyS0: No such device or address 1 Answer Sorted by: 1 QEMU emulates synthetic machines which are not strict copies of their real counterparts. ![]() When I launch QEMU kernel boots, but then I get this message: The initrd argument in call to qemu-system-arm is pointing to Kernel is of version 3.3.7 and for the filesystem I've selected to be cpio, non-compressed. and I've configured it to create toolchain, kernel and filesystem image for ARM Cortex-A9 target. I decided to use buildroot, version 2012.05. It is intended for use in Linux but can be used by U-Boot also, so. I have managed to launch simple "Hello World" example following this instructions:īut now I want to create filesystem by myself. For QEMU on ARM, RISC-V and one PPC target, the devicetree is created on-the-fly by QEMU. I am working with QEMU 1.1.0, emulating Versatile Express board with ARM Cortex-A9. ![]()
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