Pocketchip安装RetroArch

/usr/lib/arm-linux-gnueabihf/libSDL2.so：对‘wl_egl_window_get_attached_size’未定义的            引用
/usr/lib/arm-linux-gnueabihf/libSDL2.so：对‘wl_egl_window_destroy’未定义的引用
/usr/lib/arm-linux-gnueabihf/libSDL2.so：对‘wl_egl_window_create’未定义的引用
/usr/lib/arm-linux-gnueabihf/libSDL2.so：对‘wl_egl_window_resize’未定义的引用
collect2: error: ld returned 1 exit status
Makefile:187: recipe for target 'retroarch' failed
make: *** [retroarch] Error 1

解决方法地址
https://old.reddit.com/r/ChipCommunity/comments/f3wxtj/pico8_symbol_lookup_error_wl_egl_window_destroy/

我的操作步骤
下载libsdl2-2.0-0_2.0.2+dfsg1-6_armhf.deb
地址http://chip.jfpossibilities.com/chip/debian/repo/pool/main/libs/libsdl2/libsdl2-2.0-0_2.0.2+dfsg1-6_armhf.deb
安装
sudo dpkg -i libsdl2-2.0-0_2.0.2+dfsg1-6_armhf.deb
对libsdl2进行了降级操作
最后重新编译通过

2020.6.21 经过测试，下面购买的那个屏幕，出现了问题，背光灯时亮时不亮，可能是电路不兼容，长时间不正常工作挂了吧，差不多2个月。所以，你们要是买了，出现了类似的问题，别过来怼我……
4.3寸IPS电阻触摸屏（300亮度）其他亮度未测试，不建议买
点击购买地址 给卖家说要300亮度的4.3寸800*480电阻触摸屏
重新编译PocketChip的dts，并用添加的这个替换面板定义
sudo apt install make gcc
git clone https://github.com/KoljaWindeler/CHIP-dt-overlays
cd CHIP-dt-overlays/compiler/
./install.sh
cd ..
make clean all
git clone https://github.com/ntc-chip-revived/CHIP-dt-overlays.git
mv CHIP-dt-overlays/firmware/ .
mv CHIP-dt-overlays/nextthingco/ .
rm -rf CHIP-dt-overlays
make clean all
nano nextthingco/dip-pocket-common.dtsi
编辑Pocketchip文件,只需替换下面的面板定义，fragment@5 声明与5英寸800x480屏幕兼容

__overlay__ {
        panel {
                #address-cells = <1>;
                #size-cells = <0>;
                compatible = "allwinner,sun4i-a10-sub-evb-5-lcd";

make clean all
sudo cp firmware/early/*.dtbo /lib/firmware/nextthingco/chip/early/
sudo reboot

X11视频加速 2D加速

sudo apt-get install git build-essential xorg-dev xutils-dev x11proto-dri2-dev
sudo apt-get install libltdl-dev libtool automake libdrm-dev

git clone https://github.com/ssvb/xf86-video-fbturbo.git
cd xf86-video-fbturbo

autoreconf -vi
./configure --prefix=/usr
make -j2

sudo make install

添加设备
sudo nano /etc/X11/xorg.conf

Section "Device"
        Identifier      "Allwinner A10/A13 FBDEV"
        Driver          "fbturbo"
        Option          "fbdev" "/dev/fb0" 
        Option          "SwapbuffersWait" "true"
EndSection

最后重启
sudo reboot

达到的效果，用SMPlayer以X11模式播放720P以下视频不再卡顿

sudo apt-get install cmake
sudo apt-get install libx11-dev

git clone https://github.com/ptitSeb/gl4es.git
git checkout v1.1.4

cd gl4es
mkdir build
cd build
cmake .. -DCHIP=1 -DCMAKE_BUILD_TYPE=RelWithDebInfo
//-j2不加了易报内存不够
make 

cd ../
cd lib/
sudo mv libGL.so.1 /usr/lib/arm-linux-gnueabihf/libGL.so.1.2.0

如果之前安装了xf86-video-fbturbo 请先禁用
sudo nano /etc/X11/xorg.conf

#Section "Device"
#        Identifier      "Allwinner A10/A13 FBDEV"
#        Driver          "fbturbo"
#        Option          "fbdev" "/dev/fb0" 
#        Option          "SwapbuffersWait" "true"
#EndSection

然后重启

sudo apt-get install mesa-utils
glxgears

如果是GUI版会看到下图，如果是home版可能看不到齿轮，因为窗口太大……

相关地址
https://github.com/ptitSeb/gl4es
https://forum.armbian.com/topic/1420-opengl-on-mali-gpu-bananapi-orangepi-pc-etc/

安装tightvncserver
sudo apt install tightvncserver
启动
vncserver :1
设置远程访问密码
修改密码
vncpasswd

用vnc登录 ip:1

关闭VNC服务
vncserver -kill :1

先备份xstartup原始文件，再编辑
sudo mv -v .vnc/xstartup .vnc/xstartup.backup
sudo nano ~/.vnc/xstartup

#!/bin/sh
export XKL_XMODMAP_DISABLE=1
unset SESSION_MANAGER
unset DBUS_SESSION_BUS_ADDRESS
 
exec /etc/X11/xinit/xinitrc
 
xfce4-panel &
xfsettingsd &
xfwm4 &
xfdesktop &
pcmanfm &
xfce4-terminal &
 
[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
vncconfig -iconic &
 
startxfce4 &

更改配置文件的权限：
sudo chmod +x ~/.vnc/xstartup

我这边装的桌面是 xfce4

开机自动启动
sudo nano /etc/systemd/system/vncserver@.service

[Unit]
Description=Start TightVNC server at startup
After=syslog.target network.target

[Service]
Type=simple
User=chip
PAMName=login
PIDFile=/home/%u/.vnc/%H%i.pid
ExecStart=/usr/bin/vncserver -depth 24 -geometry 1024x768 %i

[Install]
WantedBy=multi-user.target 

sudo systemctl daemon-reload
sudo systemctl enable vncserver@:1.service

关闭
vncserver -kill :1

启动
sudo systemctl start vncserver@:1.service

最后重启
sudo reboot