Installing Debian Jessie on QEMU AArch64

Tue, 27 Jan 2015 13:06:00 +0000

I previously wrote about how to run AArch64 UEFI on QEMU, but it did not really cover how to do anything useful with it. So here is a follow-up, showing how you can install and run a full Debian installation. The steps below require at least version 2015.01 of linaro-edk2.

Building QEMU

Full support for AArch64 (the 64-bit ARM architecture) was only added into QEMU version 2.2.0, so will probably not yet be in any distribution-provided QEMU. So for now, let's build our own:

$ git clone git://git.qemu-project.org/qemu.git
$ cd qemu
$ git checkout -b 2.2.0-stable v2.2.0
$ ./configure --prefix=/usr/local --target-list=aarch64-softmmu
$ make -j`getconf _NPROCESSORS_ONLN`
$ sudo make install

Create ROM Images

The aarch64 virt machine sports two emulated 64MB NOR flash devices, holding the platform firmware and its persistent environment. We use the IntelBds flavour of the UEFI images, which is what the x86 Ovmf QEMU port does.

$ mkdir ~/arm64-qemu && cd ~/arm64-qemu
$ dd if=/dev/zero of=flash0.img bs=1M count=64
$ LINARO_EDK2_URL=http://releases.linaro.org/15.01/components/kernel/uefi-linaro/
$ wget $LINARO_EDK2_URL/release/qemu64-intelbds/QEMU_EFI.fd
$ dd if=QEMU_EFI.fd of=flash0.img conv=notrunc
$ dd if=/dev/zero of=flash1.img bs=1M count=64

Block devices

We need to prepare image files for the emulated HDD as well as the installation CDROM. The CDROM image, we just download - until Debian Jessie has actually been released, from the weekly snapshots. I would recommend the netinst iso, which is 150MB in size and grabs all packages from the network. If you need to do an installation somewhere with no networking, go for the 4.4GB single DVD image instead.

For the HDD image, we just need to create an empty file of sufficient size to hold our system - I would say 8GB, but if you're doing something very limited you could get away with less.

$ dd if=/dev/zero of=hda.img bs=1M count=8192

Creating a launch script

Since we do not yet have PCI emulation on AArch64 in QEMU (underway) or EDK2 (to be commenced in the next month or so), we cannot simply use -hda and -cdrom so find ourselves in "magic rune" territory. For now, the below script is a simple enough way to launch the emulator.

#!/bin/sh

CDROM_IMG=debian-testing-arm64-netinst.iso
HDA_IMG=hda.img

make_cdrom_arg()
{
        echo "-drive file=$1,id=cdrom,if=none,media=cdrom" \
             "-device virtio-scsi-device -device scsi-cd,drive=cdrom"
}

make_hda_arg()
{
        echo "-drive if=none,file=$1,id=hd0" \
             "-device virtio-blk-device,drive=hd0"
}

HDA_ARGS=`make_hda_arg $HDA_IMG`
if [ $# -eq 1 ]; then
        case $1 in
            install)
                CDROM_ARGS=`make_cdrom_arg $CDROM_IMG`
            ;;
            *)
                CDROM_ARGS=""
            ;;
        esac
fi

qemu-system-aarch64 -m 1024 -cpu cortex-a57 -M virt -nographic \
                    -pflash flash0.img -pflash flash1.img \
                    $CDROM_ARGS $HDA_ARGS -netdev user,id=eth0 \
                    -device virtio-net-device,netdev=eth0

Launching the model

Save the above script as launch.sh, make it executable with chmod +x launch.sh and launch the emulator with ./launch.sh install. You should end up with something looking a bit like this in your terminal: