No machine configuration for raspberrypi 5

BACKGROUND

I see there's a pull request out there on adding rpi5 support. In that pull request are comments saying to build off master. I have tried building off master for meta-raspberrypi and poky but kept receiving errors about machine variable being invalid.

ISSUE

I followed the Yocto Quick Start Guide. I checked out master on both meta-raspberry layer and poky layer, set machine to "raspberrypi5" and then built "core-image-minimal". I hit the following error when doing so. I have also tried building "rpi-test-image" and "core-image-base" all of which result in the same error message.

~/yocto/rpi5build took 57s 
☕ ❯ bitbake core-image-minimal
ERROR:  OE-core's config sanity checker detected a potential misconfiguration.
    Either fix the cause of this error or at your own risk disable the checker (see sanity.conf).
    Following is the list of potential problems / advisories:
    MACHINE=raspberrypi5 is invalid. Please set a valid MACHINE in your local.conf, environment or other configuration file.
Summary: There was 1 ERROR message, returning a non-zero exit code.

WHAT I'VE TRIED

I have also tried disabling the checker in my local.conf but that doesn't work either. I have tried searching the meta-raspberrypi documentation but there's no build instructions for the raspberrypi5. I presume this is still a WIP but according to the pull request I linked above, I should be able to build off master. I have also tried creating a new build folder. All of which result in the error above.

STEPS TO REPRODUCE

1. Pull down master from poky and meta-raspberrypi layers
2. Create build workspace source src/poky/oe-init-build-env rpi5build
3. Set machine variable MACHINE = "raspberrypi5" in local.conf (not sure why there's no "raspberrypi5-64)
4. Add license exception LICENSE_FLAGS_ACCEPTED = "synaptics-killswitch" to local.conf
5. Build an image bitbake rpi-test-image or bitbake core-image-minimal

EXPECTATION

Expectation here is that I should be able to just build my image, flash it to sd card (via bzip and dd) and be on my merry way. I understand uboot support isn't added but my understanding is that I should still be able to boot with the above steps.

[agherzan]

Have you added the meta-raspberrypy layer in the layers configuration file?

[nknuth]

I can confirm that your expectations are correct. I built from the master branch (ref 92a9b7a), flashed it to my SD card, and was able to boot and run successfully on my Raspberry Pi5. Building 'core-image-weston' also works well and provides a desktop and shell. Finally, the latest build from 'master' uses the new Raspberry Pi5 UART on /dev/AMA10.

In looking at the error you reported, you might not have the meta-raspberrypi layers in your bblayers.conf file. My bblayers.conf file is as follows:
BBLAYERS += "
/home/nknuth/raspberrypi5-nknuth-build-latest/sources/poky/meta
/home/nknuth/raspberrypi5-nknuth-build-latest/sources/poky/meta-poky
/home/nknuth/raspberrypi5-nknuth-build-latest/sources/poky/meta-yocto-bsp
/home/nknuth/raspberrypi5-nknuth-build-latest/sources/meta-raspberrypi
/home/nknuth/raspberrypi5-nknuth-build-latest/sources/meta-openembedded/meta-python
/home/nknuth/raspberrypi5-nknuth-build-latest/sources/meta-openembedded/meta-oe
"