ARM64 emulator - device offline

[Serban Constantinescu]

Hi all,

I am trying to use ADB with the upstream ARM64 emulator (aosp/master) and I get the following message:

$adb devices 

List of devices attached 

emulator-5554 offline

$adb shell

error: device offline

The other emulators (arm, x86) do not report the error message mentioned above.

Could there be anything missing in my environment that the ARM64 emulator needs?

Cheers,

Serban Constantinescu 

[Miodrag Dinic]

Hi Serban,

you probably figured it by yourself by now, but you were probably trying to run the emulator built from scratch using the prebuilt kernel image (or the other way around), but you need to have both of those in sync because of the change to the
Android Pipe device/driver :

https://android-review.googlesource.com/#/c/128280/

So just rebuild both qemu & kernel and you should be fine.

Regards,
Miodrag

[timor....@gmail.com]

Hi Miodrag, Serbian
Sorry for old thread.

I seem to be facing the same issue with recent aosp master branch.

> So just rebuild both qemu & kernel and you should be fine.

Any pointers on how to "rebuild qemu & kernel"?
Do you mean the emulator with qemu support or host system qemu/kvm hypervisor?

I was not able to find documentation on getting the emulator to re-compile during the android image build..

[Miodrag Dinic]

Hi Timor,

yeah this an old thread :). Here is the current valid procedure which I use :

# Building the AOSP

mkdir aosp && cd aosp

repo init -u https://android.googlesource.com/platform/manifest

repo sync

# This is building procedure for mips32

source build/envsetup.sh

lunch aosp_mips-eng && nice make -j<N>

# Building the kernel

git clone https://android.googlesource.com/kernel/goldfish.git

cd goldfish

NOTE:

Kernel code is managed on several branches for different architectures:

Goldfish emulators : android-goldfish-3.4 : ARM, MIPS32, x86

Ranchu emulators : android-goldfish-3.10 : ARM64, MIPS64, x86_64

# mips32 example :

git checkout remotes/origin/android-goldfish-3.4 -b android-goldfish-3.4

#Use the script from android for building

<AOSP_DIR>/prebuilts/qemu-kernel/build-kernel.sh --arch=mips

---------------------------------------------------

# Get the emulator sources
mkdir emu-master-dev && cd emu-master-dev

repo init -u https://android.googlesource.com/platform/manifest -b emu-master-dev

repo sync

# Build the emulators
cd external/qemu
./android-rebuild.sh

# Lunch appropriate combo to export necessary variables for the emulator to pick up
cd <AOSP_DIR>
source build/envsetup.sh
lunch aosp_mips-eng

cd <EMU_MASTER_DEV>/external/qemu

# Run the freshly built emulators
# Prerequisite is that you have already built the lunched combo (mips32)
./objs/emulator -show-kernel -gpu on -kernel /tmp/kernel-qemu/mips-3.4/kernel-qemu

Hope this helps.