Riotboard development board series notes (VIII) -- building desktop system

The first two blogs record how to use buildroot structure riotboard The system image of , But the built systems are not GUI, The embedded liunx The system needs in many application scenarios GUI Of , So I plan to use buildroot Transplant another GUI To come over ,GUI Migration selected X Window System - Xorg, Want to know X Window System You can do it yourself , There are many introduction materials on the Internet , This blog only briefly records the migration process .

1 buildroot Download and compile

buildroot Use 2018.11.x edition , download ：

git clone https://git.busybox.net/buildroot -b 2018.11.x

Download and enter the directory , Execute first riotboard_defconfig

sudo make riotboard_defconfig

Re execution ：

sudo make menuconfig

First select X.org X Window System And enter the inner directory

Use “/” Search and select the following options ：

BR2_PACKAGE_XAPP_TWM=y
BR2_PACKAGE_XAPP_XCALC=y
BR2_PACKAGE_XAPP_XCLOCK=y
BR2_PACKAGE_XAPP_XEYES=y
BR2_PACKAGE_XAPP_XINIT=y
BR2_PACKAGE_XDRIVER_XF86_INPUT_KEYBOARD=y
BR2_PACKAGE_XDRIVER_XF86_INPUT_MOUSE=y
BR2_PACKAGE_XDRIVER_XF86_VIDEO_CIRRUS=y
BR2_PACKAGE_XDRIVER_XF86_VIDEO_FBDEV=y
BR2_PACKAGE_XDRIVER_XF86_VIDEO_VESA=y
BR2_PACKAGE_XORG7=y
BR2_PACKAGE_XSERVER_XORG_SERVER=y
BR2_PACKAGE_XTERM=y
BR2_TOOLCHAIN_BUILDROOT_CXX=y
BR2_USE_WCHAR=y

Execute compilation after saving ：

sudo make

2 System burning and testing

After compilation, burn the system to TF or SD In the card , See the previous blog for the burning method . After the system starts, you need /etc/X11/ Add a customized xorg.conf The configuration file , Different hardware platform configurations are also different .

touch /etc/X11/xorg.conf
vi /etc/X11/xorg.conf

RIoTBoard xorg The configuration file is shown below ：

Section "Device"
  Identifier      "Framebuffer"
  Driver          "fbdev"
  Option          "fbdev"         "/dev/fb0"
  Option          "HWcursor"      "false"
  Option "BackingStore" "on"
EndSection

Section "Monitor"
  Identifier "Generic Monitor"
  ModelName    "Monitor Model"
  DisplaySize 480 800
EndSection

Section "Screen"
  Identifier "Default Screen"
  Device  "Framebuffer"
  Monitor  "Generic Monitor"
EndSection

Section "Module"
 Load "fbdevhw"
 Load "shadow"
EndSection

Then execute the following command ：

xhost + localhost

Then start X Window System：

startx

Reported after startup shadowUpdatePackedWeak api A mistake we can't find ：

Current version of pixman: 0.34.0
	Before reporting problems, check http://wiki.x.org
	to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
	(++) from command line, (!!) notice, (II) informational,
	(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Thu Jan  1 00:10:22 1970
(==) Using config file: "/etc/X11/xorg.conf"
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
/usr/bin/X: symbol lookup error: /usr/lib/xorg/modules/drivers/fbdev_drv.so: undefined symbol: shadowUpdatePackedWeak
[  349.556450] EXT4-fs error (device mmcblk1p1): ext4_mb_generate_buddy:747: group 82, block bitmap and bg descriptor inconsistent: 32252 vs 32250 free clusters
xinit: giving up
xinit: unable to connect to X server: Connection refused
xinit: server error
# cat /var/log/Xorg.0.log
[   347.393] 
X.Org X Server 1.20.3

Check it on the Internet , Found to be 0.4.4 edition xdriver_xf86-video-fbdev One of the bug. For the solution, please refer to the following commit , hold xdriver_xf86-video-fbdev Version upgrade to 0.5.0 That's all right. .

https://gitlab.raptorengineering.com/openpower-firmware/buildroot/-/commit/25e5c401fa3b1082653e0313b9f7bbeac1a06533

Re write the system , establish xorg.conf The configuration file , start-up X Window System after i You can see that UI 了 , There are two on it termnal, One clock, Connect the keyboard and mouse to termnal Enter the command in . Although the interface is ugly , But I can also see UI 了 .

Reference article

1 https://unix.stackexchange.com/questions/70931/how-to-install-x11-on-my-own-linux-buildroot-system
2 https://blog.csdn.net/w6980112/article/details/47155691
3 https://www.wenjiangs.com/doc/xuoplwqw
4 https://forums.justlinux.com/showthread.php?126350-error-Can-t-open-display