ERROR: Could not locate BSP definition for jetson-nano-devkit-emmc/preempt-rt and no defconfig was provided

[fre-wolf]

Hello, my goal is to have a linux system with real time kernel on jetson nano emmc (tegra210-porg-p3448-0002-b00) on Kirkstone and I want cyclictest from poky/meta/recipes-rt to be enabled on the system. I applied the rt patches from linux-tegra and am now following the README from meta/recipes-rt:

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

I added the first line to local.conf (see # real time parameters):

# Hardware
MACHINE = "jetson-nano-devkit-emmc"

# General globals
DISTRO = "poky"
DISTRO_FEATURES:append = " x11 opengl pam"
PACKAGE_CLASSES = "package_rpm"
COPY_LIC_MANIFEST = "1"
BB_GENERATE_MIRROR_TARBALLS = "1"
hostname:pn-base-files = "illuminati"
ROOT_HOME = "/root"

# Enable systemd
DISTRO_FEATURES:append = " systemd"
DISTRO_FEATURES_BACKFILL_CONSIDERED += "sysvinit"
VIRTUAL-RUNTIME_init_manager = "systemd"
VIRTUAL-RUNTIME_initscripts = "systemd-compat-units"

# real time parameters
LINUX_KERNEL_TYPE = "preempt-rt"
PREFERRED_PROVIDER_virtual/kernel = "linux-yocto-rt"

# Bitbake defaults
CONF_VERSION = "2"
INHERIT += "rm_work"
PATCHRESOLVE = "noop"
BB_NUMBER_THREADS = "16"
BB_NUMBER_PARSE_THREADS = "16"
PARALLEL_MAKE = "-j 8"
BB_DISKMON_DIRS ??= "\
    STOPTASKS,${TMPDIR},1G,100K \
    STOPTASKS,${DL_DIR},1G,100K \
    STOPTASKS,${SSTATE_DIR},1G,100K \
    STOPTASKS,/tmp,100M,100K \
    HALT,${TMPDIR},100M,1K \
    HALT,${DL_DIR},100M,1K \
    HALT,${SSTATE_DIR},100M,1K \
    HALT,/tmp,10M,1K"

and the second line to [my-layer]/recipes-kernel/linux/linux-yocto-rt_5.15.bbappend:

COMPATIBLE_MACHINE:jetson-nano-devkit-emmc="jetson-nano-devkit-emmc"

Bitbake now apparently needs a new BSP definition and a new defconfig or it's searching these files at a wrong location:

WARNING: Host distribution "opensuseleap-15.4" has not been validated with this version of the build system; you may possibly experience unexpected failures. It is recommended that you use a tested distribution.
Loading cache: 100% |#########################################################################################################################################################################################################| Time: 0:00:00
Loaded 4157 entries from dependency cache.
Parsing recipes: 100% |#######################################################################################################################################################################################################| Time: 0:00:00
Parsing of 2684 .bb files complete (2682 cached, 2 parsed). 4158 targets, 107 skipped, 0 masked, 0 errors.
NOTE: Resolving any missing task queue dependencies

Build Configuration:
BB_VERSION           = "2.0.0"
BUILD_SYS            = "x86_64-linux"
NATIVELSBSTRING      = "universal"
TARGET_SYS           = "aarch64-poky-linux"
MACHINE              = "jetson-nano-devkit-emmc"
DISTRO               = "poky"
DISTRO_VERSION       = "4.0.7"
TUNE_FEATURES        = "aarch64 armv8a crc"
TARGET_FPU           = ""

[layers]

Initialising tasks: 100% |####################################################################################################################################################################################################| Time: 0:00:08
Sstate summary: Wanted 1099 Local 1077 Mirrors 0 Missed 22 Current 2853 (97% match, 99% complete)
Removing 12 stale sstate objects for arch jetson_nano_devkit_emmc: 100% |#####################################################################################################################################################| Time: 0:00:00
NOTE: Executing Tasks
ERROR: linux-yocto-rt-5.15.84+gitAUTOINC+e77e5259a3_e53e73b907-r0 do_kernel_metadata: Could not locate BSP definition for jetson-nano-devkit-emmc/preempt-rt and no defconfig was provided
ERROR: linux-yocto-rt-5.15.84+gitAUTOINC+e77e5259a3_e53e73b907-r0 do_kernel_metadata: ExecutionError('/home/yocto/yocto/poky/build/tmp/work/jetson_nano_devkit_emmc-poky-linux/linux-yocto-rt/5.15.84+gitAUTOINC+e77e5259a3_e53e73b907-r0/temp/run.do_kernel_metadata.106874', 1, None, None)
ERROR: Logfile of failure stored in: /home/yocto/yocto/poky/build/tmp/work/jetson_nano_devkit_emmc-poky-linux/linux-yocto-rt/5.15.84+gitAUTOINC+e77e5259a3_e53e73b907-r0/temp/log.do_kernel_metadata.106874
Log data follows:
| DEBUG: Executing python function extend_recipe_sysroot
| NOTE: Direct dependencies are ['/home/yocto/yocto/poky/build/../meta/recipes-kernel/kern-tools/kern-tools-native_git.bb:do_populate_sysroot']
| NOTE: Installed into sysroot: []
| NOTE: Skipping as already exists in sysroot: ['kern-tools-native']
| DEBUG: Python function extend_recipe_sysroot finished
| DEBUG: Executing shell function do_kernel_metadata
| NOTE: do_kernel_metadata: for summary/debug, set KCONF_AUDIT_LEVEL > 0
| ERROR: Could not locate BSP definition for jetson-nano-devkit-emmc/preempt-rt and no defconfig was provided
| WARNING: /home/yocto/yocto/poky/build/tmp/work/jetson_nano_devkit_emmc-poky-linux/linux-yocto-rt/5.15.84+gitAUTOINC+e77e5259a3_e53e73b907-r0/temp/run.do_kernel_metadata.106874:406 exit 1 from 'exit 1'
| WARNING: Backtrace (BB generated script):
| 	#1: bbfatal_log, /home/yocto/yocto/poky/build/tmp/work/jetson_nano_devkit_emmc-poky-linux/linux-yocto-rt/5.15.84+gitAUTOINC+e77e5259a3_e53e73b907-r0/temp/run.do_kernel_metadata.106874, line 406
| 	#2: do_kernel_metadata, /home/yocto/yocto/poky/build/tmp/work/jetson_nano_devkit_emmc-poky-linux/linux-yocto-rt/5.15.84+gitAUTOINC+e77e5259a3_e53e73b907-r0/temp/run.do_kernel_metadata.106874, line 272
| 	#3: main, /home/yocto/yocto/poky/build/tmp/work/jetson_nano_devkit_emmc-poky-linux/linux-yocto-rt/5.15.84+gitAUTOINC+e77e5259a3_e53e73b907-r0/temp/run.do_kernel_metadata.106874, line 437
ERROR: Task (/home/yocto/yocto/poky/build/../meta/recipes-kernel/linux/linux-yocto-rt_5.15.bb:do_kernel_metadata) failed with exit code '1'
NOTE: Tasks Summary: Attempted 5068 tasks of which 5067 didn't need to be rerun and 1 failed.

Summary: 1 task failed:
  /home/yocto/yocto/poky/build/../meta/recipes-kernel/linux/linux-yocto-rt_5.15.bb:do_kernel_metadata
Summary: There was 1 WARNING message.
Summary: There were 2 ERROR messages, returning a non-zero exit code.

Where should I try to solve this error? Is this even the correct way to implement cyclictest?
Thanks for help

[madisongh]

You don't want to set PREFERRED_PROVIDER_virtual/kernel in your setup - that's telling the build to use the linux-yocto kernel, rather than linux-tegra. If you've applied the realtime patches to your copy of linux-tegra, that should be enough.

I don't know much about rt-tests; if they're tightly coupled to specific kernel versions, you may have to use an older version (by copy-pasting the recipes from an older version of OE-Core) that would be compatible with the 4.9-based kernel we have. You could just try the version that's currently there, first, and see if the tests you want to run work.