为什么 Xorg 服务器在使用 Buildroot for Raspberry Pi4 创建的系统上失败？

如何解决为什么 Xorg 服务器在使用 Buildroot for Raspberry Pi4 创建的系统上失败？

我正在尝试使用 buildroot 为 RaspBerry Pi4 创建我自己的系统。目标是使用 Xorg、Qt5 和 OpenGLESv2 硬件渲染制作自定义操作系统。我创建了我的自定义 buildroot 配置，尚无具体内容。与默认的 raspBerry pi4 buildroot 配置非常相似，但启用了 Xorg/Mesa/OpenGLES。我的配置是：

BR2_arm=y
BR2_cortex_a72=y
BR2_ARM_FPU_NEON_VFPV4=y
BR2_CCACHE=y
BR2_CCACHE_DIR="$(BR2_EXTERNAL_I_TREE_PATH)/../.buildroot-ccache"
BR2_TOOLCHAIN_buildrOOT_GLIBC=y
BR2_TOOLCHAIN_buildrOOT_CXX=y
BR2_TARGET_GENERIC_HOSTNAME="MyHost"
BR2_TARGET_GENERIC_ISSUE="Welcome to MyHost"
BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV=y
BR2_TARGET_GENERIC_ROOT_PASSWD="4rt56gbd"
BR2_SYstem_DHCP="eth0"
BR2_ROOTFS_USERS_TABLES="$(BR2_EXTERNAL_I_TREE_PATH)/board/rpi4/users.txt"
BR2_ROOTFS_OVERLAY="$(BR2_EXTERNAL_I_TREE_PATH)/rootfs_overlay/"
BR2_ROOTFS_POST_BUILD_SCRIPT="$(BR2_EXTERNAL_I_TREE_PATH)/board/rpi4/post-build.sh"
BR2_ROOTFS_POST_IMAGE_SCRIPT="$(BR2_EXTERNAL_I_TREE_PATH)/board/rpi4/post-image.sh"
BR2_ROOTFS_POST_SCRIPT_ARGS="--add-miniuart-bt-overlay"
BR2_LINUX_KERNEL=y
BR2_LINUX_KERNEL_CUSTOM_TARBALL=y
BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION="$(call github,raspBerrypi,linux,967d45b29ca2902f031b867809d72e3b3d623e7a)/linux-967d45b29ca2902f031b867809d72e3b3d623e7a.tar.gz"
BR2_LINUX_KERNEL_DEFCONfig="bcm2711"
BR2_LINUX_KERNEL_DTS_SUPPORT=y
BR2_LINUX_KERNEL_INTREE_DTS_NAME="bcm2711-rpi-4-b"
BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
BR2_PACKAGE_GLMARK2=y
BR2_PACKAGE_MESA3D_DEMOS=y
BR2_PACKAGE_MESA3D=y
BR2_PACKAGE_MESA3D_galLIUM_DRIVER_KMSRO=y
BR2_PACKAGE_MESA3D_galLIUM_DRIVER_V3D=y
BR2_PACKAGE_MESA3D_galLIUM_DRIVER_VC4=y
BR2_PACKAGE_MESA3D_OPENGL_GLX=y
BR2_PACKAGE_MESA3D_OPENGL_ES=y
BR2_PACKAGE_XORG7=y
BR2_PACKAGE_XSERVER_XORG_SERVER=y
BR2_PACKAGE_XCB_UTIL_CURSOR=y
BR2_PACKAGE_XCB_UTIL_KEYSYMS=y
BR2_PACKAGE_XCB_UTIL_WM=y
BR2_PACKAGE_XLIB_LIBFS=y
BR2_PACKAGE_XLIB_LIBXSCRNSAVER=y
BR2_PACKAGE_XLIB_LIBXCOMPOSITE=y
BR2_PACKAGE_XLIB_LIBXFONT=y
BR2_PACKAGE_XLIB_LIBXTST=y
BR2_PACKAGE_XLIB_LIBXVMC=y
BR2_PACKAGE_XLIB_LIBXXF86DGA=y
BR2_PACKAGE_XLIB_LIBDMX=y
BR2_PACKAGE_XAPP_X11PERF=y
BR2_PACKAGE_XAPP_XCALC=y
BR2_PACKAGE_XAPP_XCLOCK=y
BR2_PACKAGE_XDRIVER_XF86_INPUT_KEYBOARD=y
BR2_PACKAGE_XDRIVER_XF86_INPUT_LIBINPUT=y
BR2_PACKAGE_XDRIVER_XF86_INPUT_MOUSE=y
BR2_PACKAGE_XDRIVER_XF86_VIDEO_FBDEV=y
BR2_PACKAGE_XDRIVER_XF86_VIDEO_FBTURBO=y
BR2_PACKAGE_XFONT_FONT_AdobE_100DPI=y
BR2_PACKAGE_XFONT_FONT_AdobE_75DPI=y
BR2_PACKAGE_XFONT_FONT_AdobE_utopIA_100DPI=y
BR2_PACKAGE_XFONT_FONT_AdobE_utopIA_75DPI=y
BR2_PACKAGE_XFONT_FONT_AdobE_utopIA_TYPE1=y
BR2_PACKAGE_XFONT_FONT_araBIC_MISC=y
BR2_PACKAGE_XFONT_FONT_BH_100DPI=y
BR2_PACKAGE_XFONT_FONT_BH_75DPI=y
BR2_PACKAGE_XFONT_FONT_BH_LUCIDATYPEWRITER_100DPI=y
BR2_PACKAGE_XFONT_FONT_BH_LUCIDATYPEWRITER_75DPI=y
BR2_PACKAGE_XFONT_FONT_BH_TTF=y
BR2_PACKAGE_XFONT_FONT_BH_TYPE1=y
BR2_PACKAGE_XFONT_FONT_BITSTREAM_100DPI=y
BR2_PACKAGE_XFONT_FONT_BITSTREAM_75DPI=y
BR2_PACKAGE_XFONT_FONT_BITSTREAM_TYPE1=y
BR2_PACKAGE_XFONT_FONT_CRONYX_CYRILLIC=y
BR2_PACKAGE_XFONT_FONT_DAEWOO_MISC=y
BR2_PACKAGE_XFONT_FONT_DEC_MISC=y
BR2_PACKAGE_XFONT_FONT_IBM_TYPE1=y
BR2_PACKAGE_XFONT_FONT_ISAS_MISC=y
BR2_PACKAGE_XFONT_FONT_JIS_MISC=y
BR2_PACKAGE_XFONT_FONT_MICRO_MISC=y
BR2_PACKAGE_XFONT_FONT_MISC_CYRILLIC=y
BR2_PACKAGE_XFONT_FONT_MISC_ETHIOPIC=y
BR2_PACKAGE_XFONT_FONT_MISC_MELTHO=y
BR2_PACKAGE_XFONT_FONT_MUTT_MISC=y
BR2_PACKAGE_XFONT_FONT_SCHUMACHER_MISC=y
BR2_PACKAGE_XFONT_FONT_SCREEN_CYRILLIC=y
BR2_PACKAGE_XFONT_FONT_SONY_MISC=y
BR2_PACKAGE_XFONT_FONT_SUN_MISC=y
BR2_PACKAGE_XFONT_FONT_WINITZKI_CYRILLIC=y
BR2_PACKAGE_XFONT_FONT_XFREE86_TYPE1=y
BR2_PACKAGE_XDATA_XCURSOR_THEMES=y
BR2_PACKAGE_NODM=y
BR2_PACKAGE_XTERM=y
BR2_PACKAGE_OPENBox=y
BR2_PACKAGE_RPI_FIRMWARE=y
BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI4=y
BR2_PACKAGE_RPI_FIRMWARE_X=y
BR2_PACKAGE_python3=y
BR2_PACKAGE_LIBDRI2=y
BR2_PACKAGE_OPENSSH=y
BR2_PACKAGE_SUDO=y
BR2_PACKAGE_S6=y
BR2_PACKAGE_S6_LINUX_UTILS=y
BR2_PACKAGE_S6_PORTABLE_UTILS=y
BR2_PACKAGE_UTIL_LINUX_BINARIES=y
BR2_PACKAGE_UTIL_LINUX_KILL=y
BR2_PACKAGE_UTIL_LINUX_MOUNT=y
BR2_TARGET_ROOTFS_EXT2=y
BR2_TARGET_ROOTFS_EXT2_4=y
BR2_TARGET_ROOTFS_EXT2_SIZE="512M"
# BR2_TARGET_ROOTFS_TAR is not set
BR2_PACKAGE_HOST_DOSFSTOOLS=y
BR2_PACKAGE_HOST_GENIMAGE=y
BR2_PACKAGE_HOST_MTOOLS=y

第一个问题来自 X 服务器。它开始工作，但非常奇怪/不正常。 Xorg 日志显示我行：

(II) xfree86: Adding drm device (/dev/dri/card1)
(II) xfree86: Adding drm device (/dev/dri/card0)
(II) no primary bus or device found falling back to sys/devices/platform/gpu/drm/card1

但是在普通的 Raspbian OS X 服务器上，首先添加 card0 然后添加 card1。并使回退到card0。为什么我的 Xorg 以 card1 开头？我认为这是我的主要问题，因为后来的 GLX 扩展没有启动。所以我无法让 OpenGLES 在我的系统中工作。

在我的 config.txt 中有一行 dtoverlay=vc4-fkms-v3d

我相信 vc4 驱动程序可以正常启动，因为我看到 /dev/dri/card0 /dev/dri/card1 和 /dev/dri/renderD128 设备

也许有人有类似的经历？我做错了什么？

解决方法

我的错。我错了，问题是按 /dev/dri/card 的顺序排列的？由 Xorg 添加。问题不同。内置于 buildroot 的 xserver 需要启用 libglamor？这应该在 buildroot 配置中启用。如果启用，则 es2_info 报告 OpenGLES 没有问题。此外，在我的情况下，glmark2-es2 仍然无法使用错误“无法打开 bo 1：权限被拒绝”