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| 03:08.56 | lkcl | edwin: 2D video output is covered by a dedicated controller which can handle 2 simultaneous framebuffers, do rescaling, it's pretty cool, it's well-understood, and has *four* different outputs including RGB/TTL, LVDS, HDMI and PAL/NTSC. it's pretty cool. |
| 03:09.44 | lkcl | ... and it has *nothing* to do with MALI because it's just bombing through memory 60 times a second (or whatever) a la framebuffer. |
| 03:10.19 | lkcl | mali *literally* is just told *exactly* the same memory address as that video output engine uses. |
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| 03:11.01 | lkcl | so, anything that's written to that framebuffer, whether it be MALI, or you doing echo "foo" > /dev/fb0 or whether Xorg writes to it, it will end up on the screen. |
| 03:11.04 | lkcl | ... make sense? :) |
| 03:12.02 | lkcl | edwin: then also there is something called G2D, that's an accelerated *2D* engine. that's told "here's the address of /dev/fb0 - get to it! go write to it!" :) |
| 03:12.49 | lkcl | and again, this has *nothing* to do with the *actual* hardware that's *READING* from that same memory area 60 times a second, treating that memory as a framebuffer. |
| 03:14.40 | lkcl | basically there's an internal memory bus, everybody from that video display unit, the mali 3d engine, the main processor *and* that g2d 2d-graphics engine, they *all* have *SIMULTANEOUS* shared access to the DDR3 RAM. |
| 03:15.17 | lkcl | this is how pretty much all embedded SoCs do their graphics, and it's also how lower-cost intel and AMD processors do "Integrated Graphics". |
| 03:15.48 | lkcl | oh - there's a VPU as well (accelerated video decode/encode engine) which *also* has access to the shared memory bus. |
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| 14:37.26 | harrr | Libre Tea Computer and Practically Perfect Computer. What is the difference? |
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| 15:32.44 | edwin | lkcl: thanks a lot for the explanation, all clear now on the 2D side! |
| 15:47.28 | edwin | lkcl: " it's possible to put in two of those ridiculously-fast Micro-SD cards i mentioned, which go up to something like 256GB each at the time of writing, and can do 80gbytes/sec transfer speeds. pretty amazing, but also it means that having a SATA drive is not so critical." do you have a specific brand name/model in mind, and is the gbytes/sec a typo? |
| 15:48.30 | edwin | (quote from http://rhombus-tech.net/crowdsupply/#questions) |
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| 17:12.16 | pseudomind | Just to let you guys know, I wrote an email to Michael Larabel who runs the Phoronix website and he did actually get around to creating a post announcing the EOMA68 crowdfunding campaign. |
| 17:12.20 | pseudomind | http://www.phoronix.com/scan.php?page=news_item&px=EOMA68-Campaign-Returns |
| 17:14.26 | pseudomind | Itâs pretty neat because he actually quoted some of the stuff I said in my email to him. |
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| 19:29.27 | arossdotme | oh yea i forgot about the sd slot on the card and the one in the laptop! |
| 19:30.04 | arossdotme | hmm me thinks i will buying buting that 128gb (cheap ones are around £30) micro sd after all :) |
| 19:53.24 | lkcl | edwin: if you look up the ultra-high-speed ones, they're like 80mbytes/sec - i've not tried one out yet but... come on! 2.5x faster than SSDs from 4-5 years ago?? :) |
| 19:53.30 | lkcl | pseudomind: awesome! |
| 19:53.57 | lkcl | in fact, let me rephrase that... AWESOME! |
| 20:14.22 | edwin | cool, thought that 80 Gbyte/sec must be a typo :) |
| 21:03.51 | arossdotme | oow didint know that cool |
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