Ubuntu core 20 on Raspberry Pi CM4 PCIE not booting

I have Raspberry Pi CM4 with Ubuntu core 20 installed. When I power off the Raspberry Pi CM4 and connect Intel AX200 Wifi Adapter in PCIe Slot and power up. The Raspberry Pi CM4 is not booting.

FYI. I tried the same on Raspberry Pi OS and it boots perfectly fine

thats a very vague statement, could you give more detail how that exposes itself (like: does not power up at all, powers up but no screen output, powers up but fails the boot at some point, there is a kernel oops during boot etc etc)

It powers up but i dont see anything on the screen
In addition i cannot ssh to device.

Is ubuntu core 20 supported on Raspberry Pi CM4 ? Because i coud not see anything in related to cm4 in

/boot/uboot/pi-kernel_231.snap/dtbs/broadcom# ls -lrt
total 235
-rwxr-xr-x 1 root root 19840 Dec 9 11:55 bcm2837-rpi-cm3-io3.dtb
-rwxr-xr-x 1 root root 20513 Dec 9 11:55 bcm2837-rpi-3-b.dtb
-rwxr-xr-x 1 root root 20933 Dec 9 11:55 bcm2837-rpi-3-b-plus.dtb
-rwxr-xr-x 1 root root 20064 Dec 9 11:55 bcm2837-rpi-3-a-plus.dtb
-rwxr-xr-x 1 root root 47632 Dec 9 11:55 bcm2711-rpi-4-b.dtb
-rwxr-xr-x 1 root root 26309 Dec 9 11:55 bcm2710-rpi-cm3.dtb
-rwxr-xr-x 1 root root 28000 Dec 9 11:55 bcm2710-rpi-3-b.dtb
-rwxr-xr-x 1 root root 28619 Dec 9 11:55 bcm2710-rpi-3-b-plus.dtb
-rwxr-xr-x 1 root root 26502 Dec 9 11:55 bcm2710-rpi-2-b.dtb

well, since you say you can boot when the PCIe card is not attached, it should at least be somewhat supported …

provbably @waveform can chime in here (as our Pi maintainer) about what is supposed/expected to work …

@ogra Yes i can boot without PCIe card attached. But I dont see any information related to CM4 also in the official website. Install Ubuntu Core on a Raspberry Pi | Ubuntu

FYI: I have installed ubuntu-core-20-arm64+raspi.img.xz in Raspberry Pi CM4.

the stable UC20 release has a very old kernel snap, better try the edge image, i clearly see a cm4 dtb on one of my local Pi4 installations here:

$ ls /run/mnt/ubuntu-seed/*cm4*

@hema Or try the classic image from http://cdimage.ubuntu.com/ubuntu-server/focal/daily-preinstalled/current/ so we can do some proper debugging.

@ogra Thanks ! I installed https://cdimage.ubuntu.com/ubuntu-core/20/edge/20210419.2/ in Raspberry Pi CM4. It boots up with the INTEL AX200 Wifi Adapter.

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