On Tue, Apr 11, 2017 at 10:18 AM, Ilia Mirkin <imirkin at alum.mit.edu> wrote: >> However, I totally agree with Alex that someone with a BE machine >> should review the whole stack before we could be confident with anything. > > Here's what I'm confident about: xf86-video-nouveau worked just fine > on top of kernel 4.3 on an AGP GeForce FX 5200 (with AGPGART turned > off because ... well ... uninorth). fbcon/fbdev accel worked, > xf86-video-nouveau's 2d accel worked, and simple demos (ala glxgears) > worked after I fixed up mesa and nv30 driver items in version ... 11.1 > it seems. As I recall it had gotten all broken in 10.0 or so by Adam > Jackson in the name of making llvmpipe work on BE, declaring all other > drivers broken, with various fixes by Michel Dänzer to get it back to > working over the years. > > Anyone "fixing" the stack has to maintain that level of functioning > through their various fixing. > > I will double-check that the above still works with the latest > kernel/xorg/xf86-video-nouveau/mesa and report back (hopefully by this > weekend). If there are any patches you'd like me to test, now's the > time to ask -- getting the box up and running is the hard part, > booting up an extra kernel -- easy. OK, so I revived my PowerMac7,3 G5 setup (PPC64 BE, NV34 GPU). Booted it with an upstream 4.11-rc7 kernel, loaded up the nouveau kernel module (which is included in that kernel), updated X to 1.19.2 and mesa to 17.0.3. Everything works fine. Specifically: fbcon on top of fbdev provided by nouveau -- colors are fine glxgears hw-accelerated by mesa on top of xf86-video-nouveau using DRI2 -- colors are fine glxgears softpipe-accelerated by mesa on top of xf86-video-nouveau -- colors are fine glxgears softpipe-accelerated by mesa on top of xf86-video-modesetting -- colors are fine xterm on top of xf86-video-nouveau -- colors are fine xterm on top of xf86-video-modesetting -- colors are fine I couldn't test anything with GLAMOR since GLAMOR requires GL 2.1 or higher, whereas nouveau's NV3x acceleration only provides GL 1.5 (due to lacking NPOT and a handful of other things). The modetest utility did have trouble with AR24 and I'm pretty sure the XR24 pattern was off too. However I wouldn't be surprised if the modetest utility itself had endian issues in the pattern generation logic. (Seems to be the case, based on a quick glance at the tests/util/format.c logic and how it's used in pattern.c.) So in short, I think the current definitions of format are fine. Cheers, -ilia
