Re:The Raspberry Beer’o’meter
by Const-me on Sunday September 15, 2019 @10:13AM
(#20977286)
> DRM uses /dev/dri/renderNNN
It’s /dev/dri/card0 on my device.
DRM has a thing called “dumb framebuffer” which exposes a memory mapped file with the CPU-accessible frame buffer data. See DRM_IOCTL_MODE_CREATE_DUMB and DRM_IOCTL_MODE_MAP_DUMB IOCTLs. The only inconvenience, some boilerplate is required to find the correct GPU connector, and setup a supported video mode.
It’s /dev/dri/card0 on my device.
DRM has a thing called “dumb framebuffer” which exposes a memory mapped file with the CPU-accessible frame buffer data. See DRM_IOCTL_MODE_CREATE_DUMB and DRM_IOCTL_MODE_MAP_DUMB IOCTLs. The only inconvenience, some boilerplate is required to find the correct GPU connector, and setup a supported video mode.