Tag Archives: fedora

Fedora 22 chrooted on an LG G4 phone

Rooting this phone was ton of hassle. You have to ask LG to send you the unlock code! (My phone, not under contract). As most of the unrooting guides miss out this vital step, here is a guide to doing that.

Anyway, now I have Fedora 22 installed using the instructions from previously. I’ve included the files you need here. NB only for 64 bit ARM phones

The phone is nice and fast. It has a 6 core 64 bit ARM process in big.LITTLE configuration, 2 x fast Cortex-A57 and 4 x slower Cortex-A53. It also has 3GB of RAM.

I wasn’t able to determine if the processor boots in HYP mode, but KVM is disabled in the Android stock kernel unfortunately.

Processor	: AArch64 Processor rev 3 (aarch64)
processor	: 0
processor	: 1
processor	: 2
processor	: 3
processor	: 4
processor	: 5
Features	: fp asimd evtstrm aes pmull sha1 sha2 crc32 
CPU implementer	: 0x41
CPU architecture: 8
CPU variant	: 0x0
CPU part	: 0xd03
CPU revision	: 3

Hardware	: Qualcomm Technologies, Inc MSM8992
Revision	: 000b

Using the on-screen keyboard sucks a lot. I might need to invest in a cheap Bluetooth keyboard.

After the break, dmesg output.

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Fedora 22 aarch64 virt-builder image

Fedora 22 was released today for x86, and almost simultaneously for aarch64. I have already built a virt-builder image, so you can install it immediately (either on real hardware or under virtualization on x86):

$ virt-builder --arch aarch64 fedora-22

To boot this on x86, use a slightly modified version of the instructions from here:

$ wget http://libguestfs.org/download/builder/fedora-22-aarch64-nvram.xz
$ unxz fedora-22-aarch64-nvram.xz
$ qemu-system-aarch64 -nodefconfig -nodefaults -display none \
    -M virt -cpu cortex-a57 -machine accel=tcg \
    -m 2048 \
    -drive if=pflash,format=raw,file=/usr/share/edk2.git/aarch64/QEMU_EFI-pflash.raw,readonly \
    -drive if=pflash,format=raw,file=fedora-22-aarch64-nvram \
    -device virtio-scsi-device,id=scsi \
    -drive file=fedora-22.img,format=raw,if=none,id=hd0 \
    -device scsi-hd,drive=hd0 \
    -netdev user,id=usernet \
    -device virtio-net-device,netdev=usernet \
    -serial stdio

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Fedora 22 virt-builder image

Fedora 22 has been released. And there is a virt-builder cloud image available:

$ virt-builder fedora-22
$ virt-install --import --name test-f22 \
    --ram 2048 --disk path=fedora-22.img,format=raw \
    --os-variant fedora21

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Fedora 21 chrooted on an aarch64 Nexus 9

fedora

A while back I bought a Nexus 9, mainly because it has a weird processor that emulates a 64 bit ARM (aarch64). Google seem to have abandoned this platform entirely, just 6 months after I got it, so fuck you too Google. Anyway here’s how I installed a Fedora 21 aarch64 chroot on the device, using virt-builder and virt-tar-out and a bunch of unnecessary hassle.

First I ran virt-builder, which takes under a minute to produce a Fedora 21 aarch64 disk image. I then used virt-tar-out to convert all the files in that disk image into a tar file:

$ virt-builder --arch aarch64 fedora-21
$ virt-tar-out -a fedora-21.img / chroot.tar

Copy this file over to the N9, and unpack it. I have rooted my N9, so I can do this as root to preserve all the permissions etc:

# mkdir root
# cd root
# tar -xf /sdcard/Download/chroot.tar
# cd ..

And how can there not be a tar utility in Android?? I had to build a static ‘tar’ for aarch64 using my existing aarch64 server, to run the above command. And and and how can there be no chroot utility either!? I ended up compiling that myself too yada yada.

After all that you can do:

# mount -o bind /dev root/dev
# mount -o bind /proc root/proc
# mount -o bind /sys root/sys
# PATH=/usr/bin:/bin LD_PRELOAD= chroot root /bin/bash

which gives me at least a Fedora 21 shell on Android.

Edit: A few further notes:

  1. When setting up a non-root user account inside the chroot, give it the same UID, GID and groups as the ordinary non-privileged Android user account. In particular it must be in the inet group, else network access is blocked.
  2. You may need to set up /etc/resolv.conf by hand in the chroot.

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How to boot a Fedora 21 aarch64 UEFI guest on x86_64

You can use virt-builder to make Fedora 21 aarch64 guests easily:

$ virt-builder --arch aarch64 fedora-21

but unless you have real aarch64 hardware, how do you boot them?

Well the latest qemu supports working system emulation for 64 bit ARM. So assuming you (a) have compiled a very new qemu-system-aarch64 (I recommend qemu from git), and (b) you have the AAVMF (UEFI for aarch64) firmware, then:

$ qemu-system-aarch64 \
    -nodefconfig -nodefaults -display none \
    -M virt -cpu cortex-a57 -machine accel=tcg -m 2048 \
    -drive if=pflash,format=raw,file=AAVMF_CODE.fd,readonly \
    -drive if=pflash,format=raw,file=vars.fd \
    -drive file=fedora-21.img,format=raw,if=none,id=hd0 \
    -device virtio-blk-device,drive=hd0 \
    -netdev user,id=usernet \
    -device virtio-net-device,netdev=usernet \
    -serial stdio

And that will boot the aarch64 guest.

Edit: If using Gerd’s AAVMF repo, replace AAVMF_CODE.fd with /usr/share/edk2.git/aarch64/QEMU_EFI-pflash.raw

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virt-builder: Fedora 21 aarch64 image available

Why has wordpress.com decided to break all inline images in postings?

If you have ARM 64 bit hardware, you can now use virt-builder to create Fedora 21 guests …

$ virt-builder fedora-21
[   1.0] Downloading: http://libguestfs.org/download/builder/fedora-21-aarch64.xz
[   5.0] Planning how to build this image
[   5.0] Uncompressing
[  12.0] Opening the new disk
[  44.0] Setting a random seed
[  44.0] Setting passwords
virt-builder: Setting random password of root to JRjjjDxEfsZuCWca
[  47.0] Finishing off
                   Output file: fedora-21.img
                   Output size: 4.0G
                 Output format: raw
            Total usable space: 5.2G
                    Free space: 4.4G (85%)

I’m thankful to Pino Toscano for adding multi-architecture support to virt-builder a while back.

As shown above, virt-builder will pick the right architecture corresponding to the host, or you can override its choice by using --arch.

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OpenStack on aarch64

OpenStack can now be installed using Fedora 21 or Rawhide, on aarch64 hardware.

You have to use the packstack --allinone install method. Ceilometer doesn’t work because we don’t have mongodb on aarch64 yet, and there are a selection of bugs which you need to work around until they are fixed[1].

The big problem is I don’t have a convenient set of aarch64 cloud images to run on it yet😦

Happy holidays everyone🙂

[1] 1170646 1174795 1174805 1175419 1175428 1175450 1175460 1175472

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