On Mon, Jul 22, 2019 at 08:41:34AM -0700, Rob Clark wrote: > It is set by the driver: > > https://patchwork.freedesktop.org/patch/315291/ > > (This doesn't really belong in devicetree, since it isn't a > description of the hardware, so the driver is really the only place to > set this.. which is fine because it is about a detail of how the > driver works.) It is more a detail about how the firmware works. IIUC the problem is that the firmware initializes the context mappings for the GPU and the OS doesn't know anything about that and just overwrites them, causing the firmware GPU driver to fail badly. So I think it is the task of the firmware to tell the OS not to touch the devices mappings until the OS device driver takes over. On x86 there is something similar with the RMRR/unity-map tables from the firmware. Regards, Joerg
