Retropie 4.x on Odroid C2

phoenix73

@detron libretro testing ppa (http://ppa.launchpad.net/libretro/testing/ubuntu/pool/) contains many packages for arm64, so it could be something to investigate too. I'll try to rebuild emulationstation deb on Odroid C2 too

detron

@phoenix73

thank you. I am very comfortable with linux, but I do not have a good understanding of what truly goes into retroarch and emulationstation setup.

good luck, and if you get anywhere, please let me know.

thank you again

roleo

Hi.
I'm trying to compile retropie using the system.sh proposed in the 1st post.
I started with emulationstation and I successfully compiled it.
Below my system:

Odroid C2 rev 0.2
Ubuntu standard image: ubuntu64-16.04lts-mate-odroid-c2-20161017

I followed the recommended procedure for ODROID C1 except for the last command:

sudo apt-get install -y git
git clone --depth=1 https://github.com/RetroPie/RetroPie-Setup.git
cd RetroPie-Setup
sudo __platform=odroid-c2 ./retropie_setup.sh

I changed also the CMakeLists.txt with the correct libMali.so path.

#check if we're running on olinuxino
MESSAGE("Looking for libMali.so")
if(EXISTS "/usr/lib/aarch64-linux-gnu/libMali.so")
    MESSAGE("libMali.so found")
    set(GLSystem "OpenGL ES")
else()
    MESSAGE("libMali.so not found")
endif()

I stopped lightdm and when I run emulationstation I can see the correct graphic screen.

roleo

Hi.
Second step.
I successfully compile retroarch and lr-mame2003.
For retroarch I used the following build_retroarch() in retroarch.sh:

function build_retroarch() {
    local params=(--enable-sdl2)
    ! isPlatform "x11" && params+=(--disable-x11 --enable-opengles --disable-ffmpeg --disable-sdl --enable-sdl2 --disable-oss --disable-pulse --disable-al --disable-jack)
    isPlatform "rpi" && params+=(--enable-dispmanx)
    isPlatform "mali" && params+=(--enable-mali_fbdev)
    isPlatform "arm" && params+=(--enable-floathard)
#    isPlatform "neon" && params+=(--enable-neon)
    isPlatform "armv8" && params+=(--disable-wayland --disable-vg --disable-miniupnpc)
    ./configure --prefix="$md_inst" "${params[@]}"
    sed -i 's/HAVE_OSS_LIB = 1/HAVE_OSS_LIB = 0/g' config.mk
    sed -i 's/HAVE_VIDEOCORE = 1/HAVE_VIDEOCORE = 0/g' config.mk
    sed -i 's/OPENGLES_LIBS = -lGLESv2 -lEGL -lGLESv2 -lbcm_host -lvcos -lvchiq_arm/OPENGLES_LIBS = -lGLESv2 -lEGL/g' config.mk
    make clean
    make
    md_ret_require="$md_build/retroarch"
}

And I patched
libretro-common/include/glsym/glsym_es2.h
adding:

#include <stdint.h>

in the first line.

For lr-mame2003 the compilation has no problems.

I tried a few games and it works!

roleo

BuZz

@roleo you shouldn't need to modify config.mk afterwards - the raspberry pi link libs/video core stuff should only be added if the raspberry pi dev libs are present on the system - which shouldn't be the case.

are you building to run on X or framebuffer ?

roleo

@BuZz
I know but if I don't modify the config.mk the compilation process doesn't complete.
And I didn't find an option to disable videocore from configure.
Similar for OSS: the compilation is ok but the linker search for -lossaudio.
Maybe I missed a parameter?

I'm building on framebuffer, X is stopped.

BuZz

I will look into getting an ODroid-c2 board.

roleo

@BuZz
Is there a donation link?
I think there are a lot of users interested.

BuZz

@roleo https://retropie.org.uk/donate/

I have sent an email to Hardkernel to see if they would be interested in providing any development boards (as it would benefit them too). If not I will buy an ODroid-C2 to start with.

roleo

Update.
I compiled also lr-fbalpha adding the following section to makefile.libretro:

else ifeq ($(platform), armv8)
    TARGET := $(TARGET_NAME)_libretro.so
    fpic := -fPIC
    SHARED := -shared -Wl,-no-undefined -Wl,--version-script=$(LIBRETRO_DIR)
    PLATFORM_DEFINES += -march=armv8-a+crc -mcpu=cortex-a53 -ffast-math
    HAVE_NEON = 1
    ENDIANNESS_DEFINES := -DLSB_FIRST
    CFLAGS += -DARM

However I can not compile lr-imame4all.

roleo

Update.
lr-fceumm ok without problems.
lr-nestopia ok without problems.
lr-snes9x2010 ok adding the following section to Makefile.libretro:

# ARMv8
else ifneq (,$(findstring armv8,$(platform)))
	EXT    ?= so
	TARGET := $(TARGET_NAME)_libretro.$(EXT)
	SHARED := -shared -Wl,--no-undefined
	fpic := -fPIC
	CC   ?= gcc
	CFLAGS += -march=armv8-a+crc -mcpu=cortex-a53 -DARM
	ASFLAGS += -mcpu=cortex-a53

lr-imame4all compiles but doesn't work.
No chances with reicast: too asm parts...

BuZz

@roleo I have been generously offered an ODroid-C2 for free from Hardkernel so I will look into adding official support once it arrives. Thanks for your code feedback etc.

roleo

@BuZz
Good news!
I hope I can help you.

roleo

Update.
Finally I compiled the lr-imame4all. I encountered two problems:
1 - The libco (src/libretro/libretro-common/libco) gives an error at runtime: "longjmp causes uninitialized stack frame", so I had to use the ucontext.c part instead of sjlj.c modifying libco.c (could be a performance issue).
2 - The file src/libretro/osinline.h contains some asm code that I tried to patch (sorry but I'm not an asm programmer :) ).

This is the code I used for the lr-imame4all.sh script:

function sources_lr-imame4all() {
    gitPullOrClone "$md_build" https://github.com/libretro/mame2000-libretro.git
    sed -i 's/#include "sjlj.c"/#include "ucontext.c"/g' src/libretro/libretro-common/libco/libco.c
    sed -i 's/#include <retro_inline.h>/#include <retro_inline.h>\n#include <stdint.h>/g' src/libretro/osinline.h
    sed -i 's/    int res_hi, res_lo;/    int64_t res;/g' src/libretro/osinline.h
    sed -i 's/("smull\\t%1,%0,%2,%3"/("smull\\t%x0,%w1,%w2"/g' src/libretro/osinline.h
    sed -i 's/: "=r"(res_hi), "=r"(res_lo)/: "=r"(res)/g' src/libretro/osinline.h
    sed -i 's/return res_hi;/return res>>32;/g' src/libretro/osinline.h
    sed -i 's/( " mov %2, %2, asr #1 \\n"/( " asr %2, %2, #1 \\n"/g' src/libretro/osinline.h
}

mphil906

Hello,

I was able to compile emulationstation on my C2 successfully, but I get the following error when trying to run it:

lvl0:   Error initializing SDL!
        Failed to connect to the Mir Server
lvl0:   Renderer failed to initialize!
lvl0:   Window failed to intialize!

This error occurs if lightdm is stopped or running. Any ideas? I'm new so go easy on me.

roleo

@mphil906
During the build, the script has also built and installed libsdl mali-2.04?
Which libsdl2 packages are installed? You should have:

odroid@odroid64:~$ dpkg --list | grep sdl2
ii  libsdl2-2.0-0:arm64                   2.0.4+4mali                                   arm64        Simple DirectMedia Layer
hi  libsdl2-dev:arm64                     2.0.4+4mali                                   arm64        Simple DirectMedia Layer development files

from this source:
https://github.com/RetroPie/SDL-mirror/tree/mali-2.0.4
and not the original ones of ubuntu.

mphil906

@roleo
Thank you for the reply, I was able to compile emulationstation succesfully. Indeed, the default Ubuntu sdl was installed. I cloned the original posters repository. I'm not entirely sure if this was the issue, but in the function platform_odroid-c2() {...} __platform_flags did not contain mali. This is what I used:

function platform_odroid-c2() {
    __default_cflags="-O3 -march=armv8-a+crc -mtune=cortex-a53 -funsafe-math-optimizations"
    __default_asflags=""
    __default_makeflags="-j2"
    __platform_flags="armv8 neon mali" #added mali flag
    __qemu_cpu=cortex-a9
    __has_binaries=0
}

Not sure if this was the issue, but it compiles and runs. Thanks! Now attempting to compile retroarch.

BuZz

Just to note - I have a board now and will be looking at adding basic support as free time permits (ES + retroarch etc first).

roleo

@mphil906
I think this was the issue.

@BuZz
Great!
Thank you.

Shakz

@mphil906
See now I was just about to give up on this...dang...lemmie drag the darn thing out and give it another shot!
Thanks for posting!