Freeplay CM4
#61
Possibly the last update on this thread.

I compiled a new display driver to hardcode the speed needed for the SPI bus and stop "underclocking" the Pi with a slower `core_freq`.

I've had a lot of luck in the past going without DMA channels by setting DUSE_DMA_TRANSFERS to OFF. This time I went with a clock divisor of 8 to make up for the additional core_freq which is now manually set to 600 in /boot/config.txt. The process to compile a new display driver is better explained here https://forum.freeplaytech.com/showthread.php?tid=4989.

Finally, I got a low profile heatsink for the Pi and shaved off a couple millimeters with a dremel tool and a piece of sand paper so it fits in the case.

I noticed the Pi is a lot faster now and some graphical glitches I was experiencing both in N64 and PSP games are now gone. Not sure if it was due to a single one of these changes or to all of them.

I see a lot of people using God of War on the PSP for performance comparisons (unsure if it can handle anything higher than that), but I'm getting a constant 30+ FPS  while playing and 60 FPS on cutscenes. I'm very happy with how it's turned out.

Thanks a lot, Flavor!


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Messages In This Thread
Freeplay CM4 - by smoscar01 - 07-12-2022, 02:38 PM
RE: Freeplay CM4 - by Flavor - 07-13-2022, 12:42 AM
RE: Freeplay CM4 - by smoscar01 - 07-13-2022, 11:46 PM
RE: Freeplay CM4 - by Flavor - 07-14-2022, 12:50 AM
RE: Freeplay CM4 - by smoscar01 - 07-14-2022, 04:35 PM
RE: Freeplay CM4 - by Flavor - 07-14-2022, 11:47 PM
RE: Freeplay CM4 - by smoscar01 - 07-15-2022, 12:39 AM
RE: Freeplay CM4 - by Flavor - 07-15-2022, 01:16 AM
RE: Freeplay CM4 - by smoscar01 - 07-15-2022, 11:33 AM
RE: Freeplay CM4 - by smoscar01 - 07-15-2022, 02:02 PM
RE: Freeplay CM4 - by Flavor - 07-16-2022, 12:31 AM
RE: Freeplay CM4 - by Flavor - 07-16-2022, 12:37 AM
RE: Freeplay CM4 - by smoscar01 - 07-16-2022, 01:53 AM
RE: Freeplay CM4 - by Flavor - 07-16-2022, 02:00 AM
RE: Freeplay CM4 - by Flavor - 07-16-2022, 02:03 AM
RE: Freeplay CM4 - by Flavor - 07-16-2022, 02:11 AM
RE: Freeplay CM4 - by Flavor - 07-16-2022, 02:24 AM
RE: Freeplay CM4 - by Flavor - 07-16-2022, 02:26 AM
RE: Freeplay CM4 - by smoscar01 - 07-16-2022, 09:06 AM
RE: Freeplay CM4 - by Flavor - 07-16-2022, 09:18 AM
RE: Freeplay CM4 - by smoscar01 - 07-16-2022, 10:24 AM
RE: Freeplay CM4 - by smoscar01 - 07-16-2022, 11:14 AM
RE: Freeplay CM4 - by smoscar01 - 07-17-2022, 06:38 AM
RE: Freeplay CM4 - by Flavor - 07-17-2022, 06:42 AM
RE: Freeplay CM4 - by smoscar01 - 07-17-2022, 09:23 AM
RE: Freeplay CM4 - by Flavor - 07-17-2022, 09:41 AM
RE: Freeplay CM4 - by smoscar01 - 07-17-2022, 10:50 AM
RE: Freeplay CM4 - by smoscar01 - 07-17-2022, 12:34 PM
RE: Freeplay CM4 - by Flavor - 07-17-2022, 12:37 PM
RE: Freeplay CM4 - by Flavor - 07-17-2022, 12:38 PM
RE: Freeplay CM4 - by Flavor - 07-17-2022, 12:45 PM
RE: Freeplay CM4 - by smoscar01 - 07-17-2022, 01:01 PM
RE: Freeplay CM4 - by Flavor - 07-17-2022, 01:30 PM
RE: Freeplay CM4 - by smoscar01 - 07-17-2022, 02:40 PM
RE: Freeplay CM4 - by smoscar01 - 07-18-2022, 06:24 AM
RE: Freeplay CM4 - by Flavor - 07-19-2022, 04:45 AM
RE: Freeplay CM4 - by smoscar01 - 07-19-2022, 06:07 AM
RE: Freeplay CM4 - by Flavor - 07-19-2022, 07:02 AM
RE: Freeplay CM4 - by Flavor - 07-19-2022, 07:10 AM
RE: Freeplay CM4 - by Flavor - 07-19-2022, 07:13 AM
RE: Freeplay CM4 - by smoscar01 - 07-19-2022, 01:10 PM
RE: Freeplay CM4 - by Flavor - 07-19-2022, 01:38 PM
RE: Freeplay CM4 - by smoscar01 - 07-19-2022, 02:26 PM
RE: Freeplay CM4 - by smoscar01 - 07-21-2022, 01:39 PM
RE: Freeplay CM4 - by Flavor - 07-21-2022, 01:48 PM
RE: Freeplay CM4 - by Flavor - 07-21-2022, 01:57 PM
RE: Freeplay CM4 - by smoscar01 - 07-21-2022, 03:44 PM
RE: Freeplay CM4 - by Flavor - 07-22-2022, 03:55 AM
RE: Freeplay CM4 - by smoscar01 - 07-22-2022, 12:55 PM
RE: Freeplay CM4 - by Flavor - 07-22-2022, 02:25 PM
RE: Freeplay CM4 - by smoscar01 - 07-22-2022, 03:05 PM
RE: Freeplay CM4 - by Flavor - 07-23-2022, 12:45 AM
RE: Freeplay CM4 - by smoscar01 - 07-24-2022, 08:52 AM
RE: Freeplay CM4 - by Flavor - 07-24-2022, 09:09 AM
RE: Freeplay CM4 - by smoscar01 - 07-24-2022, 10:53 AM
RE: Freeplay CM4 - by smoscar01 - 07-27-2022, 01:41 AM
RE: Freeplay CM4 - by Flavor - 07-27-2022, 02:14 AM
RE: Freeplay CM4 - by smoscar01 - 07-27-2022, 03:16 PM
RE: Freeplay CM4 - by Flavor - 07-28-2022, 02:13 AM
RE: Freeplay CM4 - by smoscar01 - 07-29-2022, 10:16 PM
RE: Freeplay CM4 - by smoscar01 - 08-01-2022, 06:48 AM

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