02:51 <amazingfate> I'm trying to use rga on my rk3568 board. Refering to CounterPillow's patch: https://gist.github.com/CounterPillow/6bea809f15ada7ddd3a3d7a4994fdc4e, I can enable the device. I have to set my board boot with less than 4GB to make gstreamer v4l2convert work according to this thread: https://forum.odroid.com/viewtopic.php?p=346746#p346746. CounterPillow, what gstreamer commad you've used to test rga v4l2convert? I use `gst-launch-1.0

02:51 <amazingfate> videotestsrc ! video/x-raw,width=320,height=180 ! v4l2convert ! video/x-raw,width=1920,height=1080 ! fpsdisplaysink`

06:02 <CounterPillow> amazingfate: I don't have the precise command anymore but it was something like this yes

06:05 <amazingfate> CounterPillow: what's your testing board memory size, is that larger than 4GB?

06:08 <CounterPillow> Yes, 8GB

06:15 <amazingfate> It seems that mainline rga driver only support memory less than 4GB. rk356x is the first rk chip that have memory larger than 4GB.

11:04 <hanetzer> heh. veyron-speedy (rk3288) can't even address all 4GiB at the moment.

17:32 <urja> huh? like yeah i think it ends up with a hole because MMIO space (16M? or was it a bit bigger), but the thing has LPAE and rockchip thought about it being able to do 8GB (there's an early TRM that says max RAM 8GB out there...) but then dropped it for some reason or other

17:35 <urja> (I'd still be curious to know what broke... or was it just 0 customers wanted that much and they didn't bother fixing u-boot and linux for nobody)

17:40 <robmur01> I'd imagine that a workload that can actually *use* 8GB of RAM on a 32-bit machine is hard to find outside a test lab

17:42 <urja> these days that would be: two web browsers

17:42 <robmur01> it would have to be some perfect storm of a different process per CPU each maxing out its address space

17:44 <mps> when I configured kernel for alpine linux armv7 flavor and run in qemu and use more than 2GB RAM I had to tweak some config options, LPAE some other

17:46 <urja> yeah i think non-LPAE kernel might have some limitations (user/kernel split? i'm not sure now...)

17:48 <mps> urja: this is what I tweaked to run in qemu https://git.alpinelinux.org/aports/tree/community/linux-edge/config-edge4virt.armv7

17:49 <mps> kernel config, qemu -machine virt, and can use 8GB RAM

17:50 <robmur01> main limit of a non-LPAE kernel is that it cannot possibly address more than 4GB ;)

20:52 <hanetzer> somethin along that line yeah. I know its truncated to something like 0xff00_0000 on u/core boot

21:26 <robmur01> hanetzer: that's just the physical memory map. MMIO gots to be *somewhere*...

21:30 <robmur01> just not worth the logic to try to remap 0.4% of RAM somewhere else, which would then usually incur extra software cost to access anyway

21:30 <hanetzer> yeh