为preempt_rt构建Yocto

Question

我正在为beaglebone黑色定制内核。按照本指南(http://android.serverbox.ch/?p=1273)，我能够使用基本映像成功地引导控制台。

当我尝试使用实时内核修补程序构建时，使用命令：

bitbake core-image-rt

我收到以下错误消息：

Loading cache: 100% |###############################| ETA:  00:00:00
Loaded 1222 entries from dependency cache.
Parsing recipes: 100% |#############################| Time: 00:00:00
Parsing of 862 .bb files complete (861 cached, 1 parsed). 1221 targets, 61 skipped, 0 masked, 0 errors.
NOTE: Resolving any missing task queue dependencies
NOTE: multiple providers are available for virtual/kernel (linux-yocto, linux-dummy)
NOTE: consider defining a PREFERRED_PROVIDER entry to match virtual/kernel
ERROR: Nothing PROVIDES 'linux-yocto-rt' (but /home/ste/yocto/poky/meta/recipes-rt/images/core-image-rt.bb DEPENDS on or otherwise requires it)
ERROR: linux-yocto-rt was skipped: incompatible with machine beaglebone (not in COMPATIBLE_MACHINE)
ERROR: linux-yocto-rt was skipped: incompatible with machine beaglebone (not in COMPATIBLE_MACHINE)
ERROR: linux-yocto-rt was skipped: incompatible with machine beaglebone (not in COMPATIBLE_MACHINE)
ERROR: Required build target 'core-image-rt' has no buildable providers.
Missing or unbuildable dependency chain was: ['core-image-rt', 'linux-yocto-rt']
Summary: There were 2 ERROR messages shown, returning a non-zero exit code.

我在自述文件中应用了这些建议(或者认为我已经.)：

The recipes-rt recipes provide package and image recipes for using and testing
the PREEMPT_RT kernel. The core-image-rt*.bb images are minimal images with
a couple extra packages, including rt-tests. In order to build the image with
the linux-yocto-rt kernel, be sure to include the following line in your
local.conf, bblayers.conf, or your $MACHINE.conf.

PREFERRED_PROVIDER_virtual/kernel = "linux-yocto-rt"

If you are creating a new BSP which should use linux-yocto-rt by default,
use the line above in the $MACHINE.conf in your BSP layer, and specify the
following in a linux-yocto-rt bbappend recipe:

COMPATIBLE_MACHINE_$MACHINE = $MACHINE

但仍然得到相同的错误信息。

是否有人成功地使用Yocto构建了一个实时内核？在任何地方都找不到确切的程序。

Answer 1

我能够通过在构建/conf/local.conf中添加以下内容来构建核心映像-rt

PREFERRED_PROVIDER_virtual/kernel = "linux-yocto-rt"
COMPATIBLE_MACHINE_beaglebone = "beaglebone"
COMPATIBLE_MACHINE_quilt-native = "beaglebone"