(the format is named "arm" under Ubuntu 9.10 (karmic)).īecause we're going to chroot into the rootfs directory, the kernel will look for the interepreter in the chroot copy the interpreter in the chroot: sudo cp /usr/bin/qemu-arm-static rootfs/usr/binĮnter the rootfs chroot and run the second-stage: sudo chroot rootfs /bin/bashĪnd you're done! You can create a tarball of the rootfs directory, or copy the files into an actual filesystem see Creating a filesystem from a directory. Under Debian and Ubuntu, the package should automatically pull in the "binfmt-support" package and registers the qemu-arm format check with: cat /proc/sys/fs/binfmt_misc/qemu-arm (Under Debian, the package is named qemu-user-static and under Ubuntu 9.10 (karmic) it's called qemu-arm-static.)
#Qemu debian install#
Sudo apt-get install qemu-kvm-extras-static So the following instructions expect that you're using a static version of qemu-arm ("qemu-arm-static"), and that your build environment supports the binfmt-misc module, this modules allows running any executable matching some configured pattern with an interpreter of your choice. Also, because qemu-arm itself uses shared libraries and the ld.so dynamic linker/loader from the build environment, it's impractical to copy it in the rootfs to use it with chroot-ed programs. While qemu-arm can be used to run a single armel binary from the command-line, it's impractical to use it to run a program which will fork and execute other programs. One major drawback of syscall emulation is that it that some syscalls are not emulated, so some programs might now work, also when building programs, these might configure themselve for the features of the kernel they run on instead of what the target architecture actually supports.įor rootfs creation, using syscall emulation is probably fine for core packages, but you might run into issues with higher level ones. QEMU's syscall emulation is much faster than machine emulation, but both are relatively slow when compared to native programs for your computer.
#Qemu debian code#
syscall emulation: this translates code from one architecture to another, remapping system calls (calls to the kernel) between the two architectures.you can select different package selections depending on the intended use of the rootfs via the -variant= flag for instance, -variant=minbase will create a minimal environment with essential packages and apt, while -variant=buildd will install build-essential packagesĬheck the debootstrap(8) manpage for details.you can include/exclude some packages via the -include= and -exclude= flags.by default, only packages from the "main" component are used, you can enable other components (such as "restricted", "universe", and "multiverse" for Ubuntu and "contrib" and "non-free" for Debian) with the -components= flag.only do the first phase of the bootstrapping.Debian, point at the Debian keyring instead (in the debian-archive-keyring package) verify the downloaded data with the installed Ubuntu keyring (from the ubuntu-keyring package) if you want to install e.g.The arguments tells debootstrap respectively to: keyring=/usr/share/keyrings/ubuntu-archive-keyring.gpg \ Trivially easy: mk-sbuild -arch armel lucidĭebootstrap bootstraps a Debian/Ubuntu system in multiple steps which can be divided in two stages: the parts running code/tools from the build environment, and the parts running code/tools from the target environment.įor the first stage, run something like: sudo debootstrap \ The initial image of the root filesystem can be done manually via "debootstrap", or more easily via the "mk-sbuild" wrapper. e2fsprogs or some mkfs.something tool if you want to create an actual filesytem.one of qemu-arm-static (syscall emulation) or qemu-system-arm (machine emulation).debootstrap your debootstrap should be recent enough to debootstrap the suite you're interested in.This is not the recommended nor the easiest way to create a Debian/Ubuntu armel rootfs see ARM/RootfsFromScratch for other ways.
#Qemu debian how to#
This page explains how to create a Debian/Ubuntu rootfs from scratch using debootstrap and QEMU.
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