VCHIQ(4) | Device Drivers Manual | VCHIQ(4) |
vchiq
— Broadcom
VideoCore Host Interface device driver
vchiq* at simplebus?
vchiq* at acpi?
The vchiq
driver provides support for the
VideoCore 4 GPU messaging interface in Broadcom SoCs found in boards such as
the Raspberry Pi.
Libraries in pkgsrc provide OpenGL ES support and video decoding acceleration for the VideoCore 4 using the /dev/vchiq interface exposed to userland.
Audio output support is provided by the kernel through vcaudio(4), which uses this messaging interface to the GPU internally.
Debugging information may be obtained reading the device with cat(1). eg:
cat /dev/vchiq
Information such as slots and usage by particular functions of the VideoCore 4 device are displayed.
cat(1), acpi(4), bcmgpio(4), vcaudio(4), pkgsrc/misc/raspberrypi-userland, pkgsrc/multimedia/omxplayer
The vchiq
device driver appeared in
NetBSD 7.0.
/dev/vchiq does not follow the standard model for graphical acceleration on Unix-like systems, so applications have to be specially built to take advantage of it. The interface to userland also cannot be exposed by 64-bit or big endian kernels due to problems in the upstream Broadcom code.
December 11, 2021 | NetBSD 10.99 |