翻出吃土多年的 raspberry pi 3，刷个 raspios-bullseye-arm64 来耍耍。手边有 Camera V1 (OV5647)，想来试试。
在 2022-01-28 release-note 中，标明
- rc_gui - camera interface switch removed
- raspi-config - add option to switch to legacy camera mode
- New default camera subsystem based on libcamera
- New camera demo applications (libcamera-still and libcamera-vid) have replaced raspistill and raspivid
但在使用 libcamera-hello 遇到问题如下：
terminate called after throwing an instance of 'std::runtime_error'
what(): failed to import fd 19
Aborted
查询资料，发现一个临时解决方案，在 raspi-config > Advanced Options ，开启 Glamor.
附录
libcamera-apps:arm64 (0~git20220131+7ac5197-1)
libcamera-tools:arm64 (0~git20220201+e96d0201-1)
libcamera0:arm64 (0~git20220201+e96d0201-1)
$ libcamera-hello --version
libcamera-apps build: 7ac5197216ea 01-02-2022 (14:53:46)
libcamera build: v0.0.0+3406-e96d0201
$ cat /boot/config.txt
# Automatically load overlays for detected cameras
camera_auto_detect=1
# Enable DRM VC4 V3D driver
dtoverlay=vc4-kms-v3d
$ sudo vcgencmd version
Jan 20 2022 13:58:22
Copyright (c) 2012 Broadcom
version bd88f66f8952d34e4e0613a85c7a6d3da49e13e2 (clean) (release) (start)
$ sudo vcgencmd get_camera
supported=0 detected=0
v4l2-ctl --list-devices
unicam (platform:3f801000.csi):
/dev/video0
/dev/media3
bcm2835-codec-decode (platform:bcm2835-codec):
/dev/video10
/dev/video11
/dev/video12
/dev/video18
/dev/media2
bcm2835-isp (platform:bcm2835-isp):
/dev/video13
/dev/video14
/dev/video15
/dev/video16
/dev/video20
/dev/video21
/dev/video22
/dev/video23
/dev/media0
/dev/media1