Mario Kleiner <mario.kleiner.de@xxxxxxxxx> writes: > Hi Eric and all, > > two small fixes against vc4 kms, built and tested agains the > Raspberry Pi foundations 4.4.8 kernel tree on RPi2B. > > I'm tinkering with a Rpi 2B a bit to see if your vc4 work can > already make the Pi useful as a device for some serious but low > cost neuro-science applications. > > Eric: > > Is there any public documentation about the HVS hardware video scaler > or the pixel valves? I could find other docs about Videocore's 3d > part, but nothing about hvs or the pixel valves? Or are the register > definitions inside the vc4 already all that exists in the hw? Nope, docs for display never got released. I've got docs internally, and I'm happy to try to answer questions. > Is the drm-next tree supposed to boot and work on the Pi already. > To me it's a bit confusing against which tree i should actually > work and test if i play with patches for vc4? drm-next, one of > your many branches, RPi foundation? So far i was unsuccessful in > booting kernels i built myself following tutorials. Building worked > without error or warning, but booting never made it beyond the Pi's > firmware startup splash. drm-next won't have the devicetree necessary, but linux-next does. I've been doing a lot of my development off of linux-next these days. I've been using u-boot with all of my upstream kernel development (netbooting, since swapping SD cards around is awful). Apparently for non-uboot there was some weirdness with the firmware where you needed to do non-standard things to the kernel image to get it to boot, which u-boot's kernel included, and then u-boot could load a normal linux kernel. I think that's been changed in the firmware in the last couple of weeks, though, so you might not need the weird scripting any more.
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