This week was fairly focused on getting my BCM7268 board up and running and building the kernel module for it. I first got the board booting to an NFS root on an upstream kernel – huge thanks to the STB team for the upstreaming work they’ve done, so that I could just TFTP load an upstream kernel and start working.
The second half of the week was building the DRM module. I started with copying from vc4, since our execution model is very similar. We have an MMU now, so I replaced the CMA helpers with normal shmem file allocation, and started building bits we’ll need to have a page table per DRM file descriptor. I also ripped out the display components – we’re 3D only now, and any display hardware would be in a separate kernel module and communicate through dma-bufs. Finally, I put together a register header, debugfs register decode, and part of the interrupt handlers. Next week it’s going to be getting our first interrupts handled and filling out the MMU, then I should be on to trying to actually paint some pixels!