Odroid HC4 (meson64, Mali G31, AML video decoding)

This is a note and reminder to myself about state of the support and can be hard to read for people who don't understand Linux system well but contains useful hints.

Tested with recent images in early March 2021. Legacy kernel is 4.9 and 5.10 for meson64, 5.11 for odroid.

Overview

So far the performance is good but it has a terrible support, as has pretty much always been the case in the ARM world. Shame.

Instead I'd recommend Intel mini ITX (passive cooling) or maybe SBC if you can match this board with 2 native SATA ports. The Intel boards are cheaper but memory and case will put you over the price of this board. But it will save you a headache, not to mention your valuable time.

Mainline kernel is an option if you don't want to use it as a media center or you're ok with software decoding (suboptimal solution at least but can work for some uses).

If you decide to stick with old kernel you will need to forgo the idea to use arm64 for everything as you won't get deconding without using armhf build. There are also issues with some drivers.

Sticking with old kernel and not having X or Wayland is limiting. I'd personally much rather run X and have web browser readily available along with Kodi. If this was my main use case I'd rather sell it and stick with a platform that is supported well.

Android

There is no Android HC4 image and 64-bit Pie image for C4 did not quite work. The hardware is probably different enough to not work, at no point TV worked and after reboot it repeated these errors on serial console:

init: Could not find service hosting interface vendor.amlogic.hardware.hdmicec@1.0::IDroidHdmiCEC/default
init: Could not find service hosting interface vendor.amlogic.hardware.systemcontrol@1.0::ISystemControl/default
init: Could not find service hosting interface vendor.amlogic.hardware.systemcontrol@1.1::ISystemControl/default

It did boot off of SD card that caused I/O errors with Linux images (see SD card issues section below). It might mean that it's Linux driver issue although I'm not sure if this image is large enough to trigger this.

USB flash drives and SD readers did not behave the way they did on Linux but without root I could only see them being recognized and partition table enumerated, but did not actually test them.

Pre-requisites

Having u-boot-tools and abootimg might come in handy.

Installing Linux

It has Petitboot. Boot files (boot.ini or boot.scr) always had to be placed in / otherwise they were not detected.

I don't know much about booting ARM so Petitboot was nice especially for experimenting and booting from SATA drives. It seems that it can be bypassed with a button to boot directly from SD or removing altogether. I tried it and flashed back with spiupdate_odroidhc4_20201222.img.xz from http://ppa.linuxfactory.or.kr/images/petitboot/odroidhc4/.

Netboot

Armbian installed over netboot:

in Petitboot drop to shell and run netboot_default
go back and select Debian 11 bullseye, finish installation

This will boot. It had 5.11 odroid kernel.

Image

Beware:

Armbian image does not boot, it has /boot instead of separate partition. You need to rename /boot and place boot files in / or use separate boot partition.
Also it had 5.10 meson64 kernel - I was not able to boot it (using another set of scripts either), I did not try 4.9 kernel
It uses boot.scr which can't be edited by hand. I first copied to boot.ini removed first line - binary header and recompiled with mkimage -A arm64 -T script -O linux -d boot.ini boot.scr but removing boot.scr and only having boot.ini should be enough.
vmlinuz-* is not gzipped, this can be fixed by gzip -n but I'm not sure if it's needed since I was not able to boot it anyway (even using entirely different boot.ini)

I think it works when booting from SD directly. I think it also has uImage so maybe that's why. I was not successful with Petitboot and didn't have any reason to continue trying.

CoreELEC kernel

I'm writing this from memory so you may need to correct any mistakes along the way.

Reuse CoreELEC boot files, customize as needed. Then basically just copy /lib/modules/4.9.113, maybe even /lib/firmware. It's advisable to copy amlvideodri.conf and media_modules.conf in /etc/modules-load.d to automatically load drivers for decoding.

You need to modify initrd to mount different /sysroot, otherwise it tries to load SYSTEM squashfs with CoreELEC. It may trigger 60s timeout if there is no /usr/lib/kernel-overlays. If splash-image is running it obscures the messages.

See repack script on how to modify ramdisk image.

Run this script as root (needs permision to extract device file in dev/) and it copies modified files from files/. Example init file is taken from CoreELEC 16. Mainly it replaces mounting /systroot but also adds root= option so you don't have to hardcode device name, UUID or label into the script.

Accelerated decoding

After all of my experiences I am not confident that building this will work on any Linux distribution and hardware. Maybe it will work better for you and with different library. I can't put my finger on the differences between arm64, armhf and official CoreELEC 16 builds.

Confirmed working (built 19.1 kodi from CoreELEC https://github.com/CoreELEC/xbmc/tree/aml-4.9-19.1 last change published on 2021-03-03 https://github.com/CoreELEC/xbmc/commit/e9df02b84573eacd7ce8a260b809e0c378c77465):

Armbian bullseye (build made on bullseye did not work on buster)
CoreELEC kernel 4.9.113
only with oldest armhf libamcodec https://sources.coreelec.org/libamcodec-5faa7d4d554640dd6343900e24f43be327cea314.tar.xz
Kodi has to be custom built for armhf and some code changed/removed

DietPi for HC4 does decoding but it is unusable. As are some other combinations. It has newer 4.9 kernel and I was able to run this kodi-aml build.

kplayer

Package aml-libs_20200921-8b4ccad-12_arm64.deb from http://deb.odroid.in/c4/pool/main/a/aml-libs/ is notable because it contains c4_amllibs with kplayer.

This is useful for decoding on arm64 because it works. It is also useful for testing between any failed decoding attempts as sometimes it can break decoding and require a reboot.

There are others like amplayer/smplayer, but I have not tried them.

Kodi

CoreELEC has state of the art support for AML systems. Key information is that you need to use chroot to run Kodi and libraries are available for armhf.

Currently CoreELEC uses libamcodec-31cd6eceaa1402b9f4ff5cc349e53899860fe9b9 and provides 4 different armhf libamcodec libraries. At least some of them work.

What is notable is that for some reason 5faa7d4d554640dd6343900e24f43be327cea314 tends to work outside of chroot but causes vfree errors on vdec_release. Inside of chroot there are no vdec_release.

If you don't want to build your own Kodi take whole CoreELEC and put it in chroot. I've built it and it does work but whatever you do, always use chroot. Otherwise it does not work and nobody is going to tell you this.

CHROOT=/path/to/elec

mount -t proc none $CHROOT/proc
mount -o bind /dev $CHROOT/dev
mount -o bind /run $CHROOT/run
mount -o bind /sys $CHROOT/sys

# to access any local media
mkdir -p $CHROOT/mnt/host
mount -o bind / $CHROOT/mnt/host

chroot $CHROOT /usr/lib/kodi/kodi.bin

Of course you will still need to run your system on CoreELEC kernel.

CoreELEC quirks

Remove /usr/share/kodi/system/settings/appliance.g12x.xml for turning off display mode switching
echo "1360x768p60hz\n720p60hz\n1080p60hz" > /storage/.kodi/userdata/disp_cap
<showexitbutton>true</showexitbutton> in /usr/share/kodi/system/advancedsettings.xml

Building Kodi

Beware: Don't even attempt this, there lies insanity. Building is not that hard but it does not run as expected!

This is where I started: https://forum.odroid.com/viewtopic.php?p=251673&sid=76187422e888b7822d2564cae74d6899#p251673

This is still WIP but key issues are these:

get libamcodec from https://sources.coreelec.org/, you want 31cd6eceaa1402b9f4ff5cc349e53899860fe9b9 at the time of writing
-DCMAKE_C_COMPILER=arm-linux-gnueabihf-gcc -DCMAKE_CXX_COMPILER=arm-linux-gnueabihf-g++
need to add --cpu=cortex-a73.cortex-a53 --arch=arm to CMakeLists.txt
(because of ENABLE_INTERNAL_FMT=ON) libfmt.a is also built as 64-bit, I had to set CMAKE_CXX_COMPILER:FILEPATH=/usr/bin/arm-linux-gnueabihf-g++ manually in build/fmt/src/fmt-build/CMakeCache.txt and let it build again (you might need to delete some build stage tracking files)
remove CAESinkPULSE::Register(); in xbmc/windowing/amlogic/WinSystemAmlogic.cpp if you don't build with PulseAudio support

I also did these while running Kodi outside of chroot but it's pointless:

remove multi_vdec (I think this prevents invisible video)
prevent division by 0 (happened only on armhf) in xbmc/cores/VideoPlayer/VideoPlayer.cpp: if (hint.fpsscale > 0 && hint.fpsrate / hint.fpsscale > 200) { and maybe fallback to values 60000 and 1001 like the original if

You need to install armhf dependencies for build.

If Kodi is built with libsmbclient then samba-libs:armhf will require python3:armhf.

`arm64` build notes

List taken from Linux build readme file in repository.

(This includes libsmbclient!) Dependencies I used for armhf build (including libsmbclient:armhf), I had to do a fair share of fixing dependencies after doing arm64 build beforehand - I recommend clean system:

autoconf automake autopoint gettext autotools-dev cmake curl default-jre
gawk flatbuffers-compiler gdc gperf libasound2-dev:armhf libass-dev:armhf
libavahi-client-dev:armhf libavahi-common-dev:armhf libbluetooth-dev:armhf
libbluray-dev:armhf libbz2-dev:armhf libcdio-dev:armhf libcec-dev:armhf
libp8-platform-dev:armhf libcrossguid-dev:armhf libcurl4-gnutls-dev:armhf
libcwiid-dev:armhf libdbus-1-dev:armhf libegl1-mesa-dev:armhf
libenca-dev:armhf libflac-dev:armhf libfontconfig-dev:armhf libfmt-dev:armhf
libfreetype6-dev:armhf libfribidi-dev:armhf libfstrcmp-dev:armhf
libgcrypt-dev:armhf libgif-dev:armhf libgles2-mesa-dev:armhf libgl-dev:armhf
libglew-dev:armhf libglu-dev:armhf libgnutls28-dev:armhf
libgpg-error-dev:armhf libgtest-dev:armhf libiso9660-dev:armhf
libjpeg-dev:armhf liblcms2-dev:armhf liblirc-dev:armhf libltdl-dev:armhf
liblzo2-dev:armhf libmicrohttpd-dev:armhf libmariadb-dev-compat:armhf
libnfs-dev:armhf libogg-dev:armhf libomxil-bellagio-dev:armhf
libpcre3-dev:armhf libplist-dev:armhf libpng-dev:armhf libpulse-dev:armhf
libshairplay-dev:armhf libsmbclient-dev:armhf libspdlog-dev:armhf
libsqlite3-dev:armhf libssl-dev:armhf libtag1-dev:armhf libtiff5-dev:armhf
libtinyxml-dev:armhf libtool libudev-dev:armhf libva-dev:armhf
libvdpau-dev:armhf libvorbis-dev:armhf libxkbcommon-dev:armhf libxmu-dev:armhf
libxrandr-dev:armhf libxslt1-dev:armhf libxt-dev:armhf waylandpp-dev:armhf
netcat wayland-protocols wipe lsb-release meson nasm ninja-build python3-dev
python3-pil python3-minimal rapidjson-dev:armhf swig unzip uuid-dev:armhf yasm
zip zlib1g-dev:armhf libcap2-dev:armhf ccache libinput-dev:armhf
libdav1d-dev:armhf clang-format libunistring-dev:armhf libpython3.9-dev:armhf
libiso9660++-dev:armhf

(This includes libsmbclient!) Dependencies I used for arm64 build (depending on build options some may be unused):

autoconf automake autopoint gettext autotools-dev cmake curl default-jre
gawk flatbuffers-compiler gdc gperf libasound2-dev libass-dev
libavahi-client-dev libavahi-common-dev libbluetooth-dev libbluray-dev
libbz2-dev libcdio-dev libcec-dev libp8-platform-dev libcrossguid-dev
libcurl4-gnutls-dev libcwiid-dev libdbus-1-dev libegl1-mesa-dev libenca-dev
libflac-dev libfontconfig-dev libfmt-dev libfreetype6-dev libfribidi-dev
libfstrcmp-dev libgcrypt-dev libgif-dev libgles2-mesa-dev libgl-dev
libglew-dev libglu-dev libgnutls28-dev libgpg-error-dev libgtest-dev
libiso9660-dev libjpeg-dev liblcms2-dev liblirc-dev libltdl-dev liblzo2-dev
libmicrohttpd-dev libmariadb-dev-compat libnfs-dev libogg-dev
libomxil-bellagio-dev libpcre3-dev libplist-dev libpng-dev libpulse-dev
libshairplay-dev libsmbclient-dev libspdlog-dev libsqlite3-dev libssl-dev
libtag1-dev libtiff5-dev libtinyxml-dev libtool libudev-dev libva-dev
libvdpau-dev libvorbis-dev libxkbcommon-dev libxmu-dev libxrandr-dev
libxslt1-dev libxt-dev waylandpp-dev netcat wayland-protocols wipe lsb-release
meson nasm ninja-build python3-dev python3-pil python3-minimal rapidjson-dev
swig unzip uuid-dev yasm zip zlib1g-dev libcap2-dev ccache libinput-dev
libdav1d-dev clang-format libunistring-dev

Install dependencies and prepare to build:

apt install `cat DEPS.install`
mkdir $HOME/kodi-build
cd $HOME/kodi-build
## cmake ../kodi -DCMAKE_INSTALL_PREFIX=/usr/local -DCORE_PLATFORM_NAME=aml -DAPP_RENDER_SYSTEM=gles
cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local -DCORE_PLATFORM_NAME=aml \
    -DENABLE_INTERNAL_FLATBUFFERS=ON \
    -DENABLE_ALSA=ON -DENABLE_AIRTUNES=ON -DENABLE_UPNP=ON \
    -DENABLE_INTERNAL_FMT=ON -DENABLE_INTERNAL_RapidJSON=ON \
    -DENABLE_OPENGLES=ON -DENABLE_OPENGL=OFF -DENABLE_X=OFF \
    -DVERBOSE=OFF -DENABLE_NEON=ON \
    -DWITH_CPU=cortex-a73.cortex-a53 -DWITH_ARCH=aarch64 \
    -DENABLE_PULSEAUDIO=OFF -DENABLE_CCACHE=ON \
    -DENABLE_INTERNAL_FFMPEG=ON \
    -DENABLE_APP_AUTONAME=OFF -DENABLE_DVDCSS=OFF -DENABLE_INTERNAL_CROSSGUID=OFF -DENABLE_OPTICAL=OFF \
    -DENABLE_EVENTCLIENTS=ON -DENABLE_CAP=ON \
    -DENABLE_VDPAU=OFF \
-DAML_INCLUDE_DIR=AML/c4_amllibs.arm64/usr/include \
-DAPP_RENDER_SYSTEM=gles \ 
    ../xbmc

# other possible changes
# -DENABLE_SMBCLIENT=OFF \
# -DENABLE_AIRTUNES=OFF -DENABLE_UPNP=OFF \
# -DENABLE_INTERNAL_RapidJSON=OFF \
# -DENABLE_MDNS=OFF \

Then based on this https://github.com/AlexELEC/AE-AML/blob/master/projects/S812/packages/libamcodec/package.mk I had to use libamcodec headers from https://github.com/surkovalex/libamcodec/tarball/bb19db7 and do some updates - this patch https://github.com/lippone/EmuELEC/blob/EmuELEC/packages/multimedia/libamcodec/patches/codec_ctrl-added-codec_get_vdec_info.patch and struct vdec_info in amstream.h from https://github.com/CoreELEC/linux-amlogic/blob/4a29617122b6bbc234cb7e2c70627f1c54f71f67/include/linux/amlogic/media/utils/amstream.h to finish build.

Unfortunately it was unstable, especially playing H265 and seeking. H264 was fairly stable but I didn't test it extensively. I guess the resulting library is not compatible enough. I later tried chroot and revisited header changes but it did not seem to make any difference.

I tried to build several other libamcodec but I also put back multi_vdec whcih proved so far to add problems (vfm/map probably did not set up properly and video was not visible).

So far my build from surkovalex and c2_aml_libs worked best (the latter flickers UI but in the former video image disappeared between experiments). codesnake 5e23a8181 build prints errors like send control failed,handle=54,cmd=80085308,paramter=6ccb5650, t=ffffffff errno=25.

`armhf` build notes

This is what I ended up with for armhf (at least keep out libsmbclient because it requires armhf python3):

cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=/usr/local \
 -DCORE_PLATFORM_NAME=aml -DENABLE_INTERNAL_FLATBUFFERS=ON \
 -DENABLE_ALSA=ON -DENABLE_AIRTUNES=ON -DENABLE_UPNP=ON \
 -DENABLE_INTERNAL_FMT=ON -DENABLE_INTERNAL_RapidJSON=ON \
 -DENABLE_OPENGLES=ON -DENABLE_OPENGL=OFF -DENABLE_X=OFF -DVERBOSE=OFF \
 -DENABLE_NEON=ON -DWITH_CPU=cortex-a73.cortex-a53 -DWITH_ARCH=arm \
 -DENABLE_PULSEAUDIO=OFF -DENABLE_CCACHE=ON -DENABLE_INTERNAL_FFMPEG=ON \
 -DENABLE_APP_AUTONAME=OFF -DENABLE_DVDCSS=OFF \
 -DENABLE_INTERNAL_CROSSGUID=OFF -DENABLE_OPTICAL=OFF \
 -DENABLE_EVENTCLIENTS=ON -DENABLE_CAP=ON -DENABLE_VDPAU=OFF \
 -DAML_INCLUDE_DIR=AML/libamcodec/usr/include/ -DAPP_RENDER_SYSTEM=gles \
 -DCMAKE_C_COMPILER=arm-linux-gnueabihf-gcc \
 -DCMAKE_CXX_COMPILER=arm-linux-gnueabihf-g++ \
-DENABLE_MDNS=OFF \
-DENABLE_SMBCLIENT=OFF \
 ../xbmc

# other possible changes
# -DENABLE_AIRTUNES=OFF -DENABLE_UPNP=OFF \
# -DENABLE_INTERNAL_RapidJSON=OFF \

Outside of chroot this was only stable with 5faa7d4d554640dd6343900e24f43be327cea314 version of libamcodec, my build of libamcodec was fairly stable without multi_vdec but double seek could cause hang and reboot.

IR wakeup

Only works with CoreELEC kernel. Other kernels (at least 5.11) don't seem to be able to set IR code to trigger this (this doesn't work in either suspend or poweroff).

WoL wakeup

Works with CoreELEC, not exactly sure about others. Pre-requisite is that interface goes down on poweroff otherwise it doesn't work.

Make sure you have interface defined in /etc/network/interfaces so it can be shut down. Not sure if ifupdown-extra package was needed too.

What is notable is that ethtool may report d but it will actually work. During boot/bootloader on serial console some messages regarding setting wake-on-lan to 0 or 1 can be seen. So some driver support might be involved if it still doesn't work. It doesn't seem to work with 5.11 though leaving no way to wake up from suspend.

Related explanations:

Console and/or Kodi UI going black/invisible

Boot parameters from CoreELEC work well but had to add consoleblank=0. This prevents any image beside video going away after ~5 minutes, even though it's set to 600 by default.

X11/Wayland

It kind of worked but I have my doubts about performance (Kodi UI) or video smoothness (software decoding). Wayland had weird crashes on start with enlightenment.

On Debian bullseye 5.10 meson64 kernel I managed to install Mesa Panfrost driver with panfrost.ko module for Mali G31. X11 and Wayland works okay. I'm not sure if PAN_MESA_DEBUG="bifrost" was needed: https://wiki.debian.org/PanfrostLima#Enable_support_for_Mali_.22Bifrost.22_GPUs

If you see llvmpipe as driver then it does not work.

Seeing [drm] Initialized panfrost is good indication that it will work but X11 tries to use fbdev driver because Debian has config to use it, I tried this instead (it might work automatically if not forced to fbdev):

Section "ServerFlags"
        Option  "AutoAddGPU" "off"
EndSection

Section "OutputClass"
        Identifier "Meson"
        MatchDriver "meson"
        Driver "modesetting"
        Option "PrimaryGPU" "true"
EndSection

I also tried libva-v4l2-request release-2019.03 with some patch I found to fix build issues. vainfo fails to init. I still tried to use v4l2 decoding via mpv and ffplay but only got H264 to play and image severely was broken. I did not

Related commands:

# drm context did not work, had to remove it
LIBVA_DRIVER_NAME=v4l2-request vainfo
LIBVA_DRIVER_NAME=v4l2-request vainfo --display drm --device /dev/dri/renderD128
mpv --drm-connector=HDMI-A-1 --vo=gpu --gpu-context=drm --hwdec=auto --hwdec-codecs=all
ffplay -vcodec h264_v4l2m2m
v4l2-ctl  --list-devices
# only showed something about VP9
v4l2-ctl -d /dev/video0 --all

I'm not sure what to make of this. There may be issues in both drivers and clients for v4l2 decoding.

Kodi systemd service

Just basic service file to autostart Kodi:

cat >/etc/systemd/system/kodi-chroot.service <<END
[Unit]
Description=Kodi chroot mounts

[Service]
Type=oneshot
RemainAfterExit=true
ExecStart=/coreelec/kodi-prepare
ExecStop=/coreelec/kodi-teardown
User=root
StandardOutput=journal

[Install]
WantedBy=kodi.service
END

cat >/etc/systemd/system/kodi.service <<END
[Unit]
Description=Kodi

[Service]
# work around black screen, change to mode that we don't use
# and kodi will change mode back fixing black screen in the process
# ...if black screen appears just exit kodi and let it reset
ExecStartPre=/bin/sh -c 'echo 720p60hz > /sys/class/display/mode'
ExecStart=/kodi
User=root
Restart=always
StandardOutput=journal
RootDirectory=/coreelec
MountAPIVFS=true

[Install]
WantedBy=multi-user.target
END

systemctl daemon-reload
systemctl enable kodi
systemctl enable kodi-chroot

Unresolved issues

RAID

With old 4.9.113 kernel dm-raid 1.9.1 seems to prevent suspend. Sometimes even assembled array seems to prevent successful suspend but mounted raid seems to break it always. Newer 4.9 with 1.9.1 did not have this issue so it might be fixable.

TV compatibility

On one TV everything works ok and on another it's black screen (and no sound) until I switch to another HDMI output and back. Everything works with Intel graphics, no switching needed.

Couldn't confirm whether Android fixes this as C4 image was unable to output anything.

CEC wakeup

I think this only works on CoreELEC or maybe it requires CoreELEC Kodi but it caused a reboot. No further testing.

SATA suspend

During experiments I encontered SATA drives being disconnected after suspend. I'm not sure which distribution and kernel version it was. Seems to work at least with CoreELEC kernel. No further testing.

Storage compatibility

My limited experiments on Android suggest that each of these issues is fixable (and some of them even fixed) in Linux drivers. Unfortunately some of these issues are present in Petitboot drivers too.

UPDATE: After more testing, USB drive and SD reader issues seem to be fixed on 5.11 odroid kernel from netboot. Internal reader appears to be working too although I would need to boot off it to confirm. It is possible that installer is running old kernel and had problems with internal reader and it could be installed via working USB reader. There is still possibility that Petitboot wouldn't be able to boot off it via internal reader anyway since it has the same issues (it uses 4.9 kernel) and needs to be able to read boot files (having small boot partition at the start work around that).

SD card compatibility

I was able to use older 2GB SD fine and for small images like CoreELEC my 8GB Class 10 cards worked too. IIRC it didn't matter if it booted 4.9 or 5.10 kernel and netboot installer failed to create partitions on 8GB card.

SanDisk A1 C10 V30 UHS-I U3 32GB cards are recommended by Armbian.

USB storage compatibility

For 4.9 kernel a bunch of I/O errors usually, cant read partition table, sector 0 and so on:

Error: USB flash drives - 8GB, 16GB
Error: SDXC card reader
Works: USB-SATA (at least this one)
Works: SD card reader (older one) that acts like hub
Works: microSD card reader (old and tiny)

Common denominator seems to be some kind of faster flash memory (SDXC?) and faster SD card readers. It doesn't quite make sense to me.

I managed to boot off USB SD reader with 8GB SD card. On second attempt for some reason but it's a valid workaround for internal reader.

I haven't tested as much hardware on 5.10 kernel but broken SD reader worked (Petitboot can't scan and boot off it though). And it is possibly fixed in 4.10:

Kodi

My build outside of chroot plays videos with 5faa7d4d554640dd6343900e24f43be327cea314 and so far stable but on each seek and stopped playback I get this:

[ 3033.565114] vdec_release instance ffffff8013396000, total 1
[ 3033.565121] Trying to vfree() bad address (ffffffbf026b95c0)
[ 3033.565129] ------------[ cut here ]------------
[ 3033.565140] WARNING: CPU: 1 PID: 7003 at __vunmap+0xac/0xd0
[ 3033.565142] Modules linked in: lz4hc lz4hc_compress joydev zram mali_kbase(O) meson_ir meson_remote rc_core amvdec_vp9(O) amvdec_vc1(O) amvdec_real(O) amvdec_ports(O) v4l2_commo
n videobuf2_dma_contig videobuf2_memops v4l2_mem2mem videobuf2_v4l2 videobuf2_core amvdec_mpeg4(O) amvdec_mpeg12(O) amvdec_mmpeg4(O) amvdec_mmpeg12(O) amvdec_mmjpeg(O) amvdec_mjpeg
(O) amvdec_mh264(O) amvdec_h265(O) amvdec_h264mvc(O) amvdec_h264(O) amvdec_mavs(O) amvdec_avs(O) amvdec_avs2(O) stream_input(O) decoder_common(O) firmware(O) media_clock(O) amlvide
odri videobuf_res videobuf_core videodev media fuse ip_tables x_tables fbcon bitblit softcursor font

[ 3033.565207] CPU: 1 PID: 7003 Comm: VideoPlayer Tainted: G        W  O    4.9.113 #1
[ 3033.565209] Hardware name: Hardkernel ODROID-HC4 (DT)
[ 3033.565211] task: ffffffc0a304d400 task.stack: ffffffc09d7c4000
[ 3033.565215] PC is at __vunmap+0xac/0xd0
[ 3033.565217] LR is at __vunmap+0xac/0xd0
[ 3033.565220] pc : [<ffffff800920894c>] lr : [<ffffff800920894c>] pstate: 40400149
[ 3033.565221] sp : ffffffc09d7c7bf0
[ 3033.565222] x29: ffffffc09d7c7bf0 x28: ffffffc0c7baa010 
[ 3033.565226] x27: ffffff8009d05000 x26: 0000000000000006 
[ 3033.565229] x25: ffffff800aca1000 x24: 0000000000000000 
[ 3033.565232] x23: 0000000000000000 x22: ffffffbf026b95c0 
[ 3033.565235] x21: 0000000000000000 x20: ffffffc0c806cc10 
[ 3033.565238] x19: ffffffbf026b95c0 x18: 0000000000000000 
[ 3033.565240] x17: 0000007f891d6360 x16: ffffff8009286400 
[ 3033.565243] x15: 0000000000000000 x14: 0000000000000001 
[ 3033.565246] x13: 000000000000104a x12: 0000000000000001 
[ 3033.565249] x11: 0000000000000002 x10: ffffff800aca9910 
[ 3033.565252] x9 : 0000000000000000 x8 : ffffff800aca6000 
[ 3033.565255] x7 : 0000000000000000 x6 : 000000000004cb14 
[ 3033.565257] x5 : ffffffc0cd358b50 x4 : 0000000000000001 
[ 3033.565260] x3 : 0000000000000006 x2 : 0000000000000007 
[ 3033.565263] x1 : ffffffc0a304d400 x0 : 0000000000000030 
[ 3033.565267] 
               SP: 0xffffffc09d7c7b70:
[ 3033.565268] 7b70  026b95c0 ffffffbf 00000000 00000000 00000000 00000000 0aca1000 ffffff80
[ 3033.565278] 7b90  00000006 00000000 09d05000 ffffff80 c7baa010 ffffffc0 9d7c7bf0 ffffffc0
[ 3033.565287] 7bb0  0920894c ffffff80 9d7c7bf0 ffffffc0 0920894c ffffff80 40400149 00000000
[ 3033.565296] 7bd0  00000000 00000000 0909cb60 ffffff80 ffffffff 0000007f 00000000 00000000
[ 3033.565304] 7bf0  9d7c7c20 ffffffc0 09208ac0 ffffff80 026b95c0 ffffffbf c806cc10 ffffffc0
[ 3033.565313] 7c10  9ae57000 00000000 0909cbf8 ffffff80 9d7c7c40 ffffffc0 0909cc08 ffffff80
[ 3033.565322] 7c30  00001000 00000000 ffffffc8 00000000 9d7c7c90 ffffffc0 01e2ba0c ffffff80
[ 3033.565331] 7c50  13396118 ffffff80 c806cc10 ffffffc0 0aad3fa0 ffffff80 026b95c0 ffffffbf
[ 3033.565341] 
               X1: 0xffffffc0a304d380:
[ 3033.565341] d380  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3033.565350] d3a0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3033.565358] d3c0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3033.565367] d3e0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3033.565375] d400  00400008 00000000 ffffffff ffffffff 00000000 00000000 00000000 00000000
[ 3033.565384] d420  9d7c4000 ffffffc0 00000002 00400040 00000000 00000000 00000000 00000000
[ 3033.565392] d440  00000001 00000001 00000009 00000000 000a6d4c 00000001 c88f4600 ffffffc0
[ 3033.565401] d460  00000001 00000001 00000078 00000078 00000078 00000000 09d094b8 ffffff80
[ 3033.565411]
               X5: 0xffffffc0cd358ad0:
[ 3033.565412] 8ad0  0000000f 00000000 00000000 00000000 0000000d 00000000 00000000 00000000
[ 3033.565420] 8af0  00000000 00000000 00000000 00000000 090f7350 ffffff80 00000000 00000000
[ 3033.565429] 8b10  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3033.565437] 8b30  1270befb 00000005 8c78cc2f 00000000 cd35e618 ffffffc0 00000001 00000000
[ 3033.565446] 8b50  00000007 00000000 00000000 00000000 0910f474 ffffff80 00000000 00000000
[ 3033.565454] 8b70  00000000 01400000 00000000 0003cd89 00000000 00000000 00000000 00000000
[ 3033.565463] 8b90  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3033.565471] 8bb0  00000000 00000000 00000000 00000000 f248f248 00000000 00000000 00000000
[ 3033.565484] 
               X20: 0xffffffc0c806cb90:
[ 3033.565484] cb90  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3033.565493] cbb0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3033.565502] cbd0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3033.565510] cbf0  00000000 00000000 00000000 00000000 c8bde4c0 ffffffc0 ffffffff 00000000
[ 3033.565518] cc10  0ab73fb0 ffffff80 c8095840 ffffffc0 c8bde4c0 ffffffc0 c806d028 ffffffc0
[ 3033.565527] cc30  c806c818 ffffffc0 0ab73fc0 ffffff80 c8889f80 ffffffc0 0ab73ce0 ffffff80
[ 3033.565536] cc50  c80b5d20 ffffffc0 00000003 00000007 00000000 00000000 00000000 00000000
[ 3033.565544] cc70  00000001 00000000 c806cc78 ffffffc0 c806cc78 ffffffc0 00000000 00000000
[ 3033.565555] 
               X28: 0xffffffc0c7ba9f90:
[ 3033.565556] 9f90  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3033.565564] 9fb0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3033.565573] 9fd0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3033.565581] 9ff0  00000000 00000000 00000000 00000000 c8123690 ffffffc0 c8123690 ffffffc0
[ 3033.565590] a010  095d3380 ffffff80 c7baa018 ffffffc0 c7baa018 ffffffc0 406e406e 05ba05ba
[ 3033.565598] a030  00000000 404f404f 00000000 00000000 9ad18000 ffffffc0 00000001 00000000
[ 3033.565607] a050  00780078 00000006 be0a6a70 ffffffc0 00000000 00000000 00000001 00000000
[ 3033.565615] a070  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3033.565625] 
               X29: 0xffffffc09d7c7b70:
[ 3033.565625] 7b70  026b95c0 ffffffbf 00000000 00000000 00000000 00000000 0aca1000 ffffff80
[ 3033.565634] 7b90  00000006 00000000 09d05000 ffffff80 c7baa010 ffffffc0 9d7c7bf0 ffffffc0
[ 3033.565643] 7bb0  0920894c ffffff80 9d7c7bf0 ffffffc0 0920894c ffffff80 40400149 00000000
[ 3033.565652] 7bd0  00000000 00000000 0909cb60 ffffff80 ffffffff 0000007f 00000000 00000000
[ 3033.565660] 7bf0  9d7c7c20 ffffffc0 09208ac0 ffffff80 026b95c0 ffffffbf c806cc10 ffffffc0
[ 3033.565669] 7c10  9ae57000 00000000 0909cbf8 ffffff80 9d7c7c40 ffffffc0 0909cc08 ffffff80
[ 3033.565678] 7c30  00001000 00000000 ffffffc8 00000000 9d7c7c90 ffffffc0 01e2ba0c ffffff80
[ 3033.565686] 7c50  13396118 ffffff80 c806cc10 ffffffc0 0aad3fa0 ffffff80 026b95c0 ffffffbf

[ 3033.565696] ---[ end trace 82984be4259c6ec9 ]---
[ 3033.565698] Call trace:
[ 3033.565702] Exception stack(0xffffffc09d7c7a20 to 0xffffffc09d7c7b50)
[ 3033.565705] 7a20: ffffffbf026b95c0 0000007fffffffff ffffffc09d7c7bf0 ffffff800920894c
[ 3033.565707] 7a40: ffffffc09d7c7a60 ffffff800aac7eb8 0000000100000001 ffffff800aaea358
[ 3033.565710] 7a60: ffffffc09d7c7af0 ffffff800910e90c ffffffc09d7c7b50 ffffff800a1b02a8
[ 3033.565713] 7a80: 0000000000000000 ffffffbf026b95c0 0000000000000000 0000000000000000
[ 3033.565715] 7aa0: ffffff800aca1000 0000000000000006 ffffff8009d05000 ffffffc0c7baa010
[ 3033.565718] 7ac0: 0000000000000030 ffffffc0a304d400 0000000000000007 0000000000000006
[ 3033.565720] 7ae0: 0000000000000001 ffffffc0cd358b50 000000000004cb14 0000000000000000
[ 3033.565723] 7b00: ffffff800aca6000 0000000000000000 ffffff800aca9910 0000000000000002
[ 3033.565725] 7b20: 0000000000000001 000000000000104a 0000000000000001 0000000000000000
[ 3033.565727] 7b40: ffffff8009286400 0000007f891d6360
[ 3033.565732] [<ffffff800920894c>] __vunmap+0xac/0xd0
[ 3033.565736] [<ffffff8009208ac0>] vunmap+0x50/0x60
[ 3033.565740] [<ffffff800909cc08>] __dma_free+0xa8/0xe0
[ 3033.565783] [<ffffff8001e2ba0c>] vdec_input_release+0x1cc/0x240 [decoder_common]
[ 3033.565826] [<ffffff8001e242d4>] vdec_destroy+0x24/0x90 [decoder_common]
[ 3033.565868] [<ffffff8001e28794>] vdec_release+0x1b4/0x510 [decoder_common]
[ 3033.565901] [<ffffff8001e65eac>] video_port_release+0x6c/0xc0 [stream_input]
[ 3033.565931] [<ffffff8001e67b3c>] amstream_release+0x1ec/0x310 [stream_input]
[ 3033.565937] [<ffffff8009233b3c>] __fput+0xac/0x1f4
[ 3033.565940] [<ffffff8009233d04>] ____fput+0x24/0x30
[ 3033.565945] [<ffffff80090ca1f0>] task_work_run+0xdc/0x10c
[ 3033.565950] [<ffffff800908a284>] do_notify_resume+0xb4/0xc0
[ 3033.565953] [<ffffff8009082e1c>] work_pending+0x8/0x10
[ 3033.565953] [<ffffff8009082e1c>] work_pending+0x8/0x10
[ 3033.566402] the vdec            clock off, ref cnt: 0
[ 3033.566409] the parser_top      clock off, ref cnt: 0
[ 3033.566412] the demux           clock off, ref cnt: 0
[ 3033.566571] VID: VD1 off

Other useful files

# if display is black switching to another mode and back helps
# this breaks image on my build of kodi and needs to be restarted
# or perform mode switching from the settings which does the same
echo 720p60hz > /sys/class/display/mode
echo 1080p60hz > /sys/class/display/mode
echo 1360x768p60hz > /sys/class/display/mode
# show decoded video
echo 0 > /sys/class/video/disable_video
# video processing
echo "rm default" > /sys/class/vfm/map
echo "add default decoder amvideo" > /sys/class/vfm/map
# minimum requirement for visible video
echo "add default decoder amlvideo amvideo" > /sys/class/vfm/map
# what kodi uses
echo "add default decoder ppmgr amlvideo deinterlace amvideo" > /sys/class/vfm/map
# not sure what is this but kodi uses it 0/1
cat /sys/class/video/blackout_policy
cat /sys/class/video/freerun_mode

disorder/odroid-hc4

Odroid HC4 (meson64, Mali G31, AML video decoding)

Overview

Android

Pre-requisites

Installing Linux

Netboot

Image

CoreELEC kernel

Accelerated decoding

kplayer

Kodi

CoreELEC quirks

Building Kodi

arm64 build notes

armhf build notes

IR wakeup

WoL wakeup

Console and/or Kodi UI going black/invisible

X11/Wayland

Kodi systemd service

Unresolved issues

RAID

TV compatibility

CEC wakeup

SATA suspend

Storage compatibility

SD card compatibility

USB storage compatibility

Kodi

Other useful files

`arm64` build notes

`armhf` build notes