<AneoX>
Hi! Please advise, in that application i can get benefit from using 2 dram chips with 32bit bus width. Or single dram chip with 16 bit bus width has same performance? My soc is A20. Thx. Here, https://www.olimex.com/forum/index.php?topic=5725.0 some guy made some tests, but he didnt test in application with gpu usage. Does mali get best performance with dual dram chip?
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<jaganteki>
which touch screen vendor you detected is it EDT M06 or M12
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<wens>
what do you mean M06 or M12?
<wens>
isn't the model printed on the chip?
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<jaganteki>
wens, version numbers. I couldn't find it on chip, any help?
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<ptz>
I see that my uart rx line is pulled by voltage change on the rts line (which i use during transmission). is there a way to internally pull the rx line to high, so that this doesn't happen?
<heatfanjohn>
Hello, I'm trying to understand how my NTC CHIP with R8 (aka A13) chip which has a Mali 400 GPU has a frame buffer (/dev/fb0) while my Pine A64+ doesn't have a frame buffer. I used DTC to look at the Chip's sun5i-r8-chip.dtb and I see a display engine and frontend and backend nodes. If I add those to my A64 DTB will I get a frame buffer?
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<dgp>
heatfanjohn: comparing the dmesg output would be where I'd start
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<wens>
jaganteki: ugh, I don't remember, it's been a long time since I used it
<wens>
jaganteki: looks like the driver handles it though?
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<wens>
jaganteki: are you seeing issues with it?
<jaganteki>
yeah, mainline edt-ft5x06.c failed in edt_ft5x06_ts_identify
<jaganteki>
I'm trying in A64
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<heatfanjohn>
fb0's major/minor number point to devices/platform/display-engine/graphics/fb0
<heatfanjohn>
I'm confused as to how this can work without a GPU device driver
<heatfanjohn>
unless there's some builtin support for a generic GPU that all GPU chips emulate or support
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<mripard>
heatfanjohn: the GPU isn't involved in displaying stuff
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<wens>
heatfanjohn: the "GPU" on desktops is actually a 3D engine (or what we call the GPU on embedded SoCs) plus a display controller (think VGA)
<kilobyte>
heatfanjohn: think Voodoo 1
<wens>
kilobyte: nice save
<wens>
completely forgot about those
<KotCzarny>
requires being old enough to know about them ;)
<heatfanjohn>
So is there an easy way to get a display controller running with an A64 chip. I really just want to run a graphic desktop mostly remotely
<mripard>
heatfanjohn: HDMI support is coming in 4.20
<heatfanjohn>
BTW, the Chip R8 is able to display video remotely via X11. Does video use the GPU?
<mripard>
no, it doesn't
<heatfanjohn>
Oh, wow, what renders the video stream?
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<heatfanjohn>
Sorry for the newbie questions, I've taken the display from my Raspberry PIs, NTC Chips and Pine devices for granted
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<KotCzarny>
arm is in the early x86 days
<KotCzarny>
where everything had it's own acceleration (if any)
<KotCzarny>
2d, 3d, video encode/decode
<KotCzarny>
all on separate cards/chips
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<rellla>
display driver is seperate from them all.
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<dgp>
heatfanjohn: X11 was originally intended for dumb screens to display video from an expensive server in another room. That's most of what is broken about it now.. but TL;DR; you have software doing what the GPU would do much faster
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<heatfanjohn>
dgp: Yes, It's ironic because now I'm using X11 to display video from a $9 computer to a $1K+ PC ...
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<jaganteki>
any idea about this i2c issue, look like master get block while initiating transefer or something
<heatfanjohn>
I think I see now some of the differences between the A64 and A13/R8 chips. Looking at the R8 manual it has a display frontend and display backend while the A64 does not
<heatfanjohn>
As someone previous said, the A64 is for set-top boxes and not tablet devices
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<heatfanjohn>
I now have anarsoul's HDMI and related nodes added to my DTB ... do I need to connect something to the devices HDMI port to see something as I still don't have a /dev/dri/card0 device
<heatfanjohn>
Do I still need to load sun4i-drm to get a drm driver?
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<anarsoul>
heatfanjohn: man, dts is not enough for 4.18
<anarsoul>
you need to patch driver as well
<anarsoul>
I believe I already told you that
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<heatfanjohn>
anarsoul: thanks, you're correct, but I don't really know which driver to patch? sun4i-drm, sun4i-frontend and sun4i-backend? Anything else?