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by GregAC
Mon Jun 24, 2019 7:28 am
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 945
Views: 123824

Re: Raspberry Pi 4 Thread - general discussion

Tricky tricky fooling everyone into believing it wouldn't be out until 2020. I'm assuming VC5 has x11 drivers, yes? It's actually a VC6 3D block. Lots of work has been done on the MESA video drivers, which manifests as more overall speed. Any idea if we'll get our hands on the V3D v6 documentation ...
by GregAC
Mon Mar 14, 2016 3:04 pm
Forum: Gaming
Topic: Games for RPi
Replies: 4
Views: 1605

Re: Games for RPi

What kind of game are you looking to create? It's possible to write a game using python and the pygame library. The documentation contains some information about the python games that come with raspbian and tell you how to get at the source code. Studying this and playing with the code is a good way...
by GregAC
Thu Mar 10, 2016 4:24 pm
Forum: General discussion
Topic: Problems with buying Pi 3 online
Replies: 5
Views: 982

Re: Problems with buying Pi 3 online

Sunday as in Sunday 6th? Three days isn't exactly a very long to be waiting for dispatch and delivery. The PI specific online stores are likely to be pretty small operations and with all the PI 3 demand no doubt swamped with orders so things may take little longer than usual. Have you tried calling ...
by GregAC
Fri Mar 04, 2016 1:48 pm
Forum: General discussion
Topic: AArch64 code execution on Raspberry Pi3.
Replies: 36
Views: 19601

Re: AArch64 code execution on Raspberry Pi3.

Some relevent discussion here: https://github.com/raspberrypi/firmware/issues/550 Major problem stems from the fact that the VideoCore side of things is still firmly 32-bit. Not an insurmountable obstacle but (from skimming the thread) will need some cunning tricks to make certain 64-bit kernel poin...
by GregAC
Fri Mar 04, 2016 10:48 am
Forum: General discussion
Topic: Future gpu upgrades
Replies: 47
Views: 12747

Re: Future gpu upgrades

The only camera sensor that works with the Pi is out of production already. In this podcast Eben briefly discusses this: http://thepipodcast.com/the-pi-podcast-16-raspberry-pi-3-special-with-eben-upton/ I remember him saying they've got a large stock of the old sensor. When they run out they've alr...
by GregAC
Fri Mar 04, 2016 10:44 am
Forum: General discussion
Topic: Future gpu upgrades
Replies: 47
Views: 12747

Re: Future gpu upgrades

Whatever the choice for the next GPU is better have complete openness as a requirement. It took over four years to get to the still incoplete, alpha stage Full GPU documentation has been available for two years - http://www.broadcom.com/support/videocore I'd also note that source for an EGL driver ...
by GregAC
Thu Mar 03, 2016 9:42 am
Forum: General discussion
Topic: Future gpu upgrades
Replies: 47
Views: 12747

Re: Future gpu upgrades

There may well be, however such a chip wouldn't include VideoCore (other than the V3D part).

Obviously it'd have video decode/display, but it'd be totally different technology to the Pi decode/display, so major SW changes required. Doubtful it would have any kind of camera functionality too.
by GregAC
Wed Mar 02, 2016 5:54 pm
Forum: General discussion
Topic: Future gpu upgrades
Replies: 47
Views: 12747

Re: Future gpu upgrades

Broadcom still retain various members of the old V3D team (both HW & SW) (though I wouldn't care to speculate exactly what it is they're working on). The real problem is all of the stuff on top of V3D that makes up VideoCore, e.g. the camera stuff. If Broadcom make a new chip with an updated V3D it ...
by GregAC
Mon Oct 06, 2014 9:05 pm
Forum: Bare metal, Assembly language
Topic: V3D and the L2 Cache
Replies: 1
Views: 1173

V3D and the L2 Cache

Hello, Does anyone know if the V3D block is connected to the L2 cache? The V3D itself has its own L2 caches so it's conceivable it's not. I've peeked at the V3D registers whilst an OpenGL program is running and the control lists are placed at the 'direct uncached' 0xc0000000 area. Looking at the con...
by GregAC
Wed Sep 10, 2014 11:06 pm
Forum: Advanced users
Topic: Fix for SimonJHall's Q3 ARM Driver
Replies: 1
Views: 527

Re: Fix for SimonJHall's Q3 ARM Driver

Turns out I was wrong about the source of the error. What was actually happening is gcc appears to be optimising out the memset used to clear the framebuffer to 0xFF. The first time I altered the physical address being written to I had also disabled optimisation. I couldn't find an obvious way to st...
by GregAC
Wed Sep 10, 2014 6:07 pm
Forum: Advanced users
Topic: Fix for SimonJHall's Q3 ARM Driver
Replies: 1
Views: 527

Fix for SimonJHall's Q3 ARM Driver

I have been attempting to get SimonJHall's quake 3 build using the ARM side V3D drivers working. I am cross compiling but broadly following the instructions from here: http://www.raspberrypi.org/quake-iii-bounty-we-have-a-winner/ (TL;DR: Had to fix some of the code, explanation follows see bottom of...

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