Public bug reported:
On fully upgraded Ubuntu 18.04 aarch64 the vc_sm_cma kernel module does
not expose /dev/vcsm-cma, thus application working with the Raspberry Pi
Camera, e.g. raspivid, do not work properly.
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.4 LTS
Release: 18.04
Codename: bionic
Test with both linux-image-5.3.0-1017-raspi2 and linux-
image-5.3.0-1018-raspi2 in combination with with
https://github.com/raspberrypi/userland at
6e6a2c859a17a195fbb6a97c9da584dd2b9b0178 compiled using ./buildme
--aarch64 on Raspberry Pi 4 and 3+.
Everything works, if I use a recent Raspbian kernel on the Ubuntu image:
Copy RASPBIAN/boot/kernel8.img to UBUNTU/boot/firmware/vmlinuz,
RASPBIAN/boot/bcm2711-rpi-4-b.dtb to UBUNTU/boot/firmware/ and
RASPBIAN/lib/modules/4.19.97-v8+ to UBUNTU/lib/modules.
I cannot tell whether the problem is specific to the 5.3.0 kernel
compiled for Ubuntu or a general issue with the 5.3.0 kernel as the
Raspbian kernel is still based on 4.19.
** Affects: linux-raspi2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1867428
Title:
/dev/vcsm-cma missing on Ubuntu 18.04.4 aarch64
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