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注册时间： 2025-01-17

已发帖子： 9

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rk3506下DRM驱动没有/dev/fb0

新的驱动框架DRM下没有/dev/fb0,取而代之的是/dev/dri/card0,
编译了libdrm.so,
qt启用-kms，仍提示ERROR: Feature 'kms' was enabled, but the pre-condition 'libs.drm' failed.
没有解决，去内核里面启用fb,启用
<*> DRM Support for Rockchip，
<*> Support for frame buffer devices  --->   
*Enable legacy fbdev support for your modesetting driver 
重新编译内核就会出现fb0
设置环境变量，qt可以正常显示
如何使用drm，有大佬教一下不？

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Re: rk3506下DRM驱动没有/dev/fb0

DRM_LIBS = -ldrm
QMAKE_LIBS += $${DRM_LIBS}
QMAKE_LIBS_PRIVATE += $${DRM_LIBS}
QMAKE_CFLAGS += -I/home/work/work/rk3506g/hdrk3506mini/rk3506_linux6.1_sdk/buildroot/output/rockchip_rk3506/host/arm-buildroot-linux-gnueabihf/sysroot/usr/include/libdrm
QMAKE_CXXFLAGS += -I/home/work/work/rk3506g/hdrk3506mini/rk3506_linux6.1_sdk/buildroot/output/rockchip_rk3506/host/arm-buildroot-linux-gnueabihf/sysroot/usr/include/libdrm
QMAKE_LFLAGS += -Wl,-rpath-link,/home/work/work/rk3506g/hdrk3506mini/rk3506_linux6.1_sdk/buildroot/output/rockchip_rk3506/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib  -DQT_FORCE_DRM=1
不要指定路径，以上方式会导致找不到libdrm.so

指定sysroot就可以解决
-sysroot /home/work/work/rk3506g/hdrk3506mini/rk3506_linux6.1_sdk/buildroot/output/rockchip_rk3506/host/arm-buildroot-linux-gnueabihf/sysroot
configure参数如下
../qt-everywhere-src-5.15.17/configure \
-c++std c++17 \
-prefix /opt/qt5.15.17arm \
-extprefix /home/work/work/rk3506g/hdrk3506mini/rk3506_linux6.1_sdk/buildroot/output/rockchip_rk3506/target/opt/qt5.15.17arm   \
-hostprefix /home/work/work/rk3506g/qt/hostqt5.15.17arm    \
-sysroot /home/work/work/rk3506g/hdrk3506mini/rk3506_linux6.1_sdk/buildroot/output/rockchip_rk3506/host/arm-buildroot-linux-gnueabihf/sysroot  \
-confirm-license -opensource \
-release -shared  \
-xplatform linux-arm-gnueabi-g++ \
-qpa linuxfb \
-feature-linuxfb \
-make libs  \
-nomake examples  -nomake tests  \
-no-opengl \
-no-sse2 \
-no-openssl \
-no-cups \
-no-separate-debug-info \
-no-iconv \
-pch \
-qt-libjpeg \
-qt-libpng \
-qt-zlib \
-qt-freetype  \
-skip qtwayland \
-skip qt3d \
-skip qtquick3d \
-skip qtdoc  \
-skip qtandroidextras \
  -skip qtconnectivity \
  -skip qtdoc \
  -skip qtgamepad \
  -skip qtlocation \
  -skip qtmacextras \
  -skip qtnetworkauth \
  -skip qtpurchasing \
  -skip qtremoteobjects \
  -skip qtscript \
  -skip qtscxml \
  -skip qtsensors \
  -skip qtspeech \
  -skip qtsvg \
  -skip qttools \
  -skip qttranslations \
  -skip qtwayland \
  -skip qtwebengine \
  -skip qtwebview \
  -skip qtwinextras \
  -skip qtx11extras \
  -skip qtxmlpatterns \
-gui \
  -widgets \
-dbus-runtime \
  --glib=no \
  --pcre=qt \
  --harfbuzz=qt \
  --sqlite=qt \
  -plugin-sql-sqlite \
-v \
-kms \